November 5, 2014

OK… I admit that the title of this post is tongue in cheek. I was just trying to get the skeptics all worked up!!!
But I believe that this IS a genuine pre-war M70 capable of firing 303 British cartridges through a genuine wartime Winchester barrel…
The gun is “Bolt Action A” No. 27, one of the couple hundred or so tool room M70s made for ammunition testing at the Winchester and Western ammunition plants. These guns have been written about and photographed in both the Whitaker and Rule M70 books, so I won’t carry on too much. They had SINGLE SHOT receivers with no magazine well opening, just a milled oval cut for a spring loaded lever that functioned like the bolt stop on a M54. Intended as “universal” test actions, i.e. capable of firing almost any center fire rifle cartridge Winchester-Western manufactured, the front of the receiver ring was cut back to accommodate a replaceable wear plate. The receivers omitted the usual D&T holes and roll marked matting. The bolts were flat faced (no bolt face recess) and made without an extractor or extractor groove in the bolt body. Extraction was accomplished manually using a tool something like a screwdriver inserted through a rectangular cut out on the left side of the receiver ring where the gas port would normally be. There was a beveled cut on the bottom of the bolt that engaged the bolt stop lever in the receiver. Because these actions were used with test barrels of several types/diameters, they were all half stocked with reinforcing cross bolts. So UGLY that not even a Mother’s Love would suffice!!!
The test barrels themselves came in at least four varieties; pressure, velocity (#6), accuracy, and a 1.25” diameter straight shank barrel (#1). The barrels were finished in the gauge shop, not the barrel shop, and were intended to be screwed in hand tight (interchangeable), not torqued. Typically they are hand stamped with a date, caliber, and something like “A Action Only”. The 303 British velocity barrel shown on the gun is dated 3-15-42, and might have been used in ammunition testing Winchester did on US Government contract during WWII. The barrel contour is like the medium heavy target barrels and the length is 26”. It does have the pre-war right side roll mark but is hand stamped “187” “303 BRIT.” “3-15-42” “A ACTION” on top. This barrel was something that Justin and Andy Hale (pre64win.com) picked up along with a batch of regular production M70 take-off barrels, and since it’s of no use to anyone who doesn’t happen to have one of the Bolt Action A guns, they gave it to me. Thanks, Justin!!!
The other test barrel shown in the photo below of BA 27 in a cradle I built for it is a #1 barrel in 22 HORNET. With no taper, 26.5” length, and a .22 caliber bore, the barrel alone weights over 9 lb!!!
FWIW… Winchester made test barrels for a multitude of calibers, so there were many more test barrels than test actions made (although neither was supposed to get outside the plant). I’ve included a clip from one of the 1930s Winchester pressure barrel blue prints showing the “A Action” calibers.
I can only imagine that there are a few such crudely marked barrels out there, sitting in junk bins, whose owners have no idea what they’re for. If anybody runs across one of these, let me know. Wouldn’t it be COOL, for example, to have a “genuine” pre-war M70 in 50-100 W.C.F.??? It’s possible!!!
Happy New Year…
Lou
WACA 9519; Studying Pre-64 Model 70 Winchesters
Lou,
Great post. In addition to the Model 70 action and test barrels, Winchester used a fair number of the Single Shot (high-wall) actions with swapable barrels in various calibers. Allegedly, the last Winchester cartridge developed using a Single Shot action was the 300 Win Mag.
Bert
p.s. I could use that 22 Hornet barrel you have for a pet Single Shot high-wall project…
WACA Historian & Board of Director Member #6571L
November 5, 2014

Hi Bert-
Only markings on that 22 HORNET barrel are the “WP” proof (in the usual location) and this on the muzzle flat:
The barrel next to it in the photo is a take-off 300 MAGNUM Target (not Bull Gun) barrel. The 303 test barrel has no provision for sights… Did Winchester ever build commercial, i.e. for sale to the public, Single Shots with an un-tapered 1.25″ diameter straight shank barrel? That Hornet barrel is a BEAST!!! I can’t imagine anyone could hold one up… Here’s a pic of BA 27 with the Hornet barrel:
You’re spot on in that the M1885/85 and the M54 bolt action were used for centerfire ammo testing before they built the “Bolt Action A” (long centerfire) and “Bolt Action B” (short centerfire) M70 test guns… Has anyone seen one of the M1885/85 test guns? I have not…
Lou
WACA 9519; Studying Pre-64 Model 70 Winchesters
Lou,
I have seen several of the Single Shot test guns. Three or four of them were auctioned off by RIA about 12 – 15 years ago.
The ultra rare No. 6 barrel for the high-wall receiver was 1.25″ and no taper. It was at least 20-years ago (in Reno) that I got to see one of them, chambered for 32-40 and on a Schuetzen rifle. I want to say that it weighed nearly 19 lbs.
Bert
WACA Historian & Board of Director Member #6571L
Great post Lou. I love the unusual bits of history stuff.
You’re correct that some of these are still floating around.
Here are a few photos of these unusual bits of M70 research & development history. A Research test action “A” with the clamping block, and 5 research test barrels. If my recollection is correct, I got the action from Leroy Merz. The barrels were from Tom Henshaw. I’m sure you probably knew Tom.
Here’s a list of what’s in the photos.
– Single shot test/pressure “A” action.
– WWII Heavy stainless test barrel 1942 7.9MM Mauser
– WWII Heavy stainless pressure test barrel with integral pressure fixture 1943 7.92mm. See blueprint Rules page 295.
– Featherweight test barrel. Chambered in a .22 experimental cartridge.
– Xtra Heavy 1-3/8”dia stainless test barrel (.308). With Winchester research proof.
– Heavy long shank M70 .308 test barrel. With Winchester research proof.
To answer your question about other single shot rifles with extra heavy barrels. A number of the complete single shot rifles built in the mid 50’s, thru the late 60’s had a variety of unusual barrels. From a 26” .308win National Match barrel up to a couple with 1-3/8” dia at muzzle barrels. Rifle S/N 499819 has a 22-5/16” long by 1-3/8”dia extra heavy barrel chambered in .225win.
I’ve included a couple of photos of a Factory built M70 single shot Benchrest rifle. According to Tom Henshaw, it’s the only one Winchester built. I too has a 1-3/8”dia WRP proofed barrel in .308 win.
November 5, 2014

Great Stuff, Ned!!!
Another of the oddball things on BA 27 that I’ve never seen before is the bolt sleeve/safety (visible in the second photo that I posted above). The bolt sleeve is vaguely similar to the pre-war part (flat on top), except that the vertical rotating shaft of the safety is on the left, not the right, and the safety operates backwards from all other M70s, i.e. it rotates clockwise to go from ‘on safe’ to ‘fire’. It’s also a two-position safety, i.e. no middle position where the firing pin is locked but the bolt is free to open.
I wonder if this wasn’t an abandoned prototype design? The topic of the M70 safety was discussed in a Jan 15, 1943 document “Recommendation for Arms – Post War Line” in which the safety was brought up as the only design advantage of the Remington 720 over the Winchester M70:
Obviously, the three-position side swing safety ultimately adopted in 1946 operated much like the pre-war safety, while the one on BA 27 required modification of the firing pin/striker to relocate the safety notch to the left.
Strange Stuff!!!
Lou
WACA 9519; Studying Pre-64 Model 70 Winchesters
Louis Luttrell said
Great Stuff, Ned!!!Another of the oddball things on BA 27 that I’ve never seen before is the bolt sleeve/safety (visible in the second photo that I posted above). The bolt sleeve is vaguely similar to the pre-war part (flat on top), except that the vertical rotating shaft of the safety is on the left, not the right, and the safety operates backwards from all other M70s, i.e. it rotates clockwise to go from ‘on safe’ to ‘fire’. It’s also a two-position safety, i.e. no middle position where the firing pin is locked but the bolt is free to open.
I wonder if this wasn’t an abandoned prototype design? The topic of the M70 safety was discussed in a Jan 15, 1943 document “Recommendation for Arms – Post War Line” in which the safety was brought up as the only design advantage of the Remington 720 over the Winchester M70:
Obviously, the three-position side swing safety ultimately adopted in 1946 operated much like the pre-war safety, while the one on BA 27 required modification of the firing pin/striker to relocate the safety notch to the left.
Strange Stuff!!!
Lou
Hi Lou,
That safety is really interesting. Certainly new to me as well. How did you come to have both the action and the internal document? Was it just fortuitous?
I also like the display you made up for this piece. I need to do a little more of that sort of thing.
While we’re on the topic of safeties, that’s something unique to a majority of the single shot M70’s. All but one of the pre-64 rifles do not have any safety at all. No unnecessary mechanical complexity. See photo.
November 5, 2014

Hi Ned-
The safety on BA 27 is an oddity for sure. It looks like something Winchester made, but never put into production. It would improve thumb access to the safety on a gun with a telescopic sight, but would have required changes to the firing pin/striker as well that would have made the pre-war and post-war parts non-interchangeable.
I agree that a safety on guns like these “Bolt Action A/B” test rifles and the AAMU “Olympics” made little (if any) sense given the controlled conditions under which these single shot single-loaded firearms were used. The test rifles were fired from fixtures, i.e. they have no provision for aiming, so likely weren’t loaded until already secured and pointed down range. The AAMU rifles were in the hands of the best marksmen the US Army possessed and would have only been loaded on the firing range… I also suspect that there would have been considerable additional engineering involved in making a safety that would work with that super sensitive trigger…
As for the the internal document(s). These are in the CFM McCrackin Library as downloadable digital files. There are two, in particular, that I’d recommend to any Winchester collector with an interest in Post-WWII Winchester firearms (any Model):
MS20.07.27 Recommendations for Post-war Arms Line – 1945. This is the one I posted the clip from. It has sections covering every Model then in production with the inter-office discussion about future plans. The link below should take you there:
http://library.centerofthewest.org/digital/collection/p17097coll30/id/2711/rec/219
MS20.69.03 Firearms Simplification Program – 1951. This is a later document in similar format recording discussions about changes planned for the product line after 1950, including contingency plans should the Korean conflict expand into WWIII and Winchester have to go back into wartime production mode. Again, all Models are covered…
http://library.centerofthewest.org/digital/collection/p17097coll30/id/6141/rec/49
Hope these documents are helpful…
Lou
WACA 9519; Studying Pre-64 Model 70 Winchesters
Louis Luttrell said
Did Winchester ever build commercial, i.e. for sale to the public, Single Shots with an un-tapered 1.25″ diameter straight shank barrel? That Hornet barrel is a BEAST!!! I can’t imagine anyone could hold one up…
The very rare 6 wt brl was 1.25″ at the muzzle, & the 5 wt wasn’t far off at 1.12″. The 5 wt was shot in Schuetzen comp with a palm rest which relieves some of the wt, but the 6 wt may have been intended for bench rest. But even the 6 wt was modest compared to muzzle-loading slug-gun brls which were 2″ or more.
Did brl wt numbers refer strictly to external dimensions of the brl? Because a .22 bore in any given wt is obviously going to be much heavier than a large CF in the same wt brl.
November 5, 2014

Hi Clarence-
We’ll have to wait on Bert for that answer…
I believe that the barrel contour numbers I was referring to here were specific to “test” barrels and my numbering is based on sketchy documentation, i.e. a hand drawn sketch on the back of a binder, along with some other references in the wartime company records. Nothing to do with the production barrels that were affixed to the M1885/85 single shots:
I’ve seen (elsewhere in the CFM archives) the “velocity” barrel referred to as a #6 test barrel. As far as I can tell the #6 barrels were straight taper barrels dimensioned like the M54/70 medium heavy target barrels. My description of the un-tapered #1 test barrel (1″ or 1 1/4″) was from the above sketch… My (#1???) 22 HORNET test barrel is 1 1/4″ straight shank. The pressure and accuracy barrels were notably larger at the breech than either the #1 or #6 test barrels, but I haven’t seen a “number” assigned to them. Anybody have more info???
Sorry… Not much help!!!
Lou
WACA 9519; Studying Pre-64 Model 70 Winchesters
The single Shot barrels sizes were dictated by the outside dimensions, and they had no relationship to the actual weight of the barrel. I have a 40-70 Sharps Str with a 30-inch No. 4 octagon barrel, and a 22 Long Rifle 30-inch No. 3 octagon barrel… guess which one weighs more!
WACA Historian & Board of Director Member #6571L
Louis Luttrell said
Hi Ned-The safety on BA 27 is an oddity for sure. It looks like something Winchester made, but never put into production. It would improve thumb access to the safety on a gun with a telescopic sight, but would have required changes to the firing pin/striker as well that would have made the pre-war and post-war parts non-interchangeable.
I agree that a safety on guns like these “Bolt Action A/B” test rifles and the AAMU “Olympics” made little (if any) sense given the controlled conditions under which these single shot single-loaded firearms were used. The test rifles were fired from fixtures, i.e. they have no provision for aiming, so likely weren’t loaded until already secured and pointed down range. The AAMU rifles were in the hands of the best marksmen the US Army possessed and would have only been loaded on the firing range… I also suspect that there would have been considerable additional engineering involved in making a safety that would work with that super sensitive trigger…
As for the the internal document(s). These are in the CFM McCrackin Library as downloadable digital files. There are two, in particular, that I’d recommend to any Winchester collector with an interest in Post-WWII Winchester firearms (any Model):
MS20.07.27 Recommendations for Post-war Arms Line – 1945. This is the one I posted the clip from. It has sections covering every Model then in production with the inter-office discussion about future plans. The link below should take you there:
http://library.centerofthewest.org/digital/collection/p17097coll30/id/2711/rec/219
MS20.69.03 Firearms Simplification Program – 1951. This is a later document in similar format recording discussions about changes planned for the product line after 1950, including contingency plans should the Korean conflict expand into WWIII and Winchester have to go back into wartime production mode. Again, all Models are covered…
http://library.centerofthewest.org/digital/collection/p17097coll30/id/6141/rec/49
Hope these documents are helpful…
Lou
Thanks for the great information Lou. Much appreciated.
Ned
Bert H. said
The single Shot barrels sizes were dictated by the outside dimensions, and they had no relationship to the actual weight of the barrel. I have a 40-70 Sharps Str with a 30-inch No. 4 octagon barrel, and a 22 Long Rifle 30-inch No. 3 octagon barrel… guess which one weighs more!
Probably the one with the smaller hole.
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