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Question: These two leaves, for what distance are they supposed to be sighted in at? 50 and 100 yards…or?
November 5, 2014
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Hi Ian-
I’ve never shot one of these with the metallic sights, but according to Rule’s book, the shorter leaf of a Lyman 6W was 0.340″ tall while the taller leaf was 0.380″ tall. He claims the short leaf was regulated to 200 yards and the taller one to 500 yards. Seems a little excessive to me, but there’s nothing I can find in the contemporary Winchester catalogs that goes into any detail on the 375 H&H Magnum sights… 
ADDENDUM… It appears that Winchester literature stated the 200/500 yard figures in reference to the Model 54 1st Standard rifle, which was only available in 270 WCF and 30 GOV’T’06 prior to 1929. A 375 MAGNUM with the same sight would not yield those results. I think Roger “lifted” the 200/500 yard figures from M54 literature. My WAG would be maybe 50/200 yards for the 375 MAGNUM??? 
Lou
WACA 9519; Studying Pre-64 Model 70 Winchesters
My Standard Model .375 that I have hunted with has a custom express type rear site. So, I can’t help you with the Lyman 6W rear site. However the Lyman 66W that had a rear standing leaf, and a fold down front leaf was sited at 50 to 100 yards , and the Front was sited for 200 yards. This site replaced the 6W Lyman on the Model 54 in 1927. So, with this in mind I believe that Louis is accurate on his thoughts of 50/200. Back when the Lyman 6W was offered on a ramp on the .375 H&H Model 70 the shooter had three bullet weights to choose from the 235, 270, and 300 grain bullets. I would think that Winchester sited the rifle with either the 270 gr. or the 300 gr. bullet.
And so, this explains why at 100 yards my 5 shots fired with the taller leaf in place failed to hit the target and probably went over it. I did not have any additional rounds to fire.
November 5, 2014
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Hi Ian-
Just looking around, I found on the pre-64win.com website pictures of the sight alignment and bolt tags allegedly from a M70 375 H&H Magnum. Assuming that this is actually an original pair from the same firearm (as claimed), the rifle S/N was 426254 (1957), which would have used the Winchester 70B rollover rear sight, not the Lyman 6W used on your earlier rifle. But I believe it expresses Winchesters “intent” when it came to sight alignment of the 375 Magnums.
The sight tag is confusing, as it says “375” (presumably 375 H&H Magnum), and “180 grain” (which is an impossibility). But like all such sight alignment tags it does say “100 yards”. It’s not much help, but my guess is that the rifles were factory sighted with 300 grain (W-W brand, of course) ammo at 100 yards, and that would have been with the lower of the two leaves.
So I think you’re right that using the taller leaf your shots at 100 yards went high… Let us know how the next test firing goes…
Lou
WACA 9519; Studying Pre-64 Model 70 Winchesters
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