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November 1, 2013
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Louis Luttrell said
When it comes to scoping this rifle, a 220 Swift, while keeping the Lyman 48 receiver sight, one could consider mounting a pre-war Lyman Targetspot (or early STS or Junior Targetspot), Fecker, or even early Unertl, using a Lyman type BK code cross dovetail block in the barrel dovetail and Lyman type U code (0.185″ high) block on the front receiver ring. The receiver block is the same thing used on M54/70 Target rifles and the long scope sits high enough to clear the receiver sight. No added non-factory holes. This doesn’t quite give the 7.2″ spacing between mounts to yield exactly 1/4 minute click adjustments, but it’s certainly close enough for praire dogs.
So that rear sight slot is actually good for something! Extremely clean & neat mounting installation I guess I haven’t seen before–in fact, I like it better than the usual twin brl blocks. Maybe not best for the yard-long Super TS & Programmer class of optics, but for more modest scopes, just right. Slight spacing variance no handicap in respect to practical shooting.
November 5, 2014
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Hi Clarence-
The only “downside” to that approach is that you get only 6″ spacing between the front/rear mounts. You need about 7.2″ to get those micrometer adjustable mounts to produce 1/4 MOA clicks. That’s why a lot of these rifles got two D&T holes added to the top of the barrel a little forward of the barrel boss/rear sight dovetail.
Of course the setup is a little “fragile” with that long scope supported at two points only 6″ apart, but heck, it’s a varmint rifle, and as I tried to illustrate it can be perfectly period on a 1930s M54/70. 
Shoots pretty well too…
Best,
Lou
WACA 9519; Studying Pre-64 Model 70 Winchesters
November 1, 2013
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Louis Luttrell said
The only “downside” to that approach is that you get only 6″ spacing between the front/rear mounts. You need about 7.2″ to get those micrometer adjustable mounts to produce 1/4 MOA clicks. That’s why a lot of these rifles got two D&T holes added to the top of the barrel a little forward of the barrel boss/rear sight dovetail.Of course the setup is a little “fragile” with that long scope supported at two points only 6″ apart, but heck, it’s a varmint rifle, and as I tried to illustrate it can be perfectly period on a 1930s M54/70.
6″ spacing was an “approved” alternative during the time Win was making the A & B model scopes, with charts for both spacings included in the catalog; 1 point (no clicks, which I dislike anyway) equaled .10″ movement, vs .078″ for the wider spacing. 6″ spacing was also used for A5s mounted on ’03 Spfds by USMC armorers during WW I. The Win scopes were shorter than newer ones like the Fecker, but still, the arrangement is workable if you don’t drop your rifle too often.
