Yesterday was 'Dremel Day' (shudder). Removed the sight leaves by means of radical surgery. Not pretty. But it's done. Had to remove about a 1/4" square of material from each leaf to free it from the sight mount. Once free, the remnants of the pins drove out with a pin punch. There will need to be some bluing touchup. If these were Remagechesters, I'd be abasing myself with great vigor.
The scopes are now initially mounted an all the rifles. I expect there will need to be some final minor adjustment to the base slope. I deviated from the recommended installation by omitting the base pivot screws and replacing them with M/N Sight Base pins, which required enlarging the pivot holes in the bases from .115" to .120"-.125". Fortunately I have a set of number drills from a previous lifetime, and everything is snug and slop-free. It's not anywhere near as rigid and indestructible as some of the high end mounting systems we see on tactical rifles, but I think it's good enough for range use, and some prudent field carry and usage. Each M/N base still retains one of its two pins, and the bases look to be solid and rigid even minus one of their two pins. I took the precaution of mic'ing each pin and drilling accordingly. Good thing; they vary enough to require this.
The previous prototyping and experimentation with scopes and rings seems to have yielded a setup that eliminates nearly all of the excess scope height from the arrangement. The cheek weld is not ideal, but the stock does have cheek contact, if not cheekbone contact. I suspect I will end up adding some sort of additional cheek support somewhere down the road, but for now, the arrangement is satisfactory and nearing in on ideal.
(Edited to add - I just ordered Beartooth stock comb raising kits to address the cheekweld height issue:
Amazon.com: Beartooth Stock Comb Raising Kit - Black: Sports & Outdoors I'm looking at estimated delivery next Monday or Tuesday.)
The weather remains cooler and windier, mostly from a bad direction, and we are still definitely in the April Showers portion of the environmental program. While not quite a sucking quagmire, the ground continues to be soft and easily disturbed. Prudence dictates a bit more of a wait before bringing the rifles to the range. I will end up with 3 scoped 91/30's, and a good friend wants me to duplicate the arrangement on his. He has significant vision issues that preclude his being able to employ iron sights.
I'm not expecting surgically precise accuracy. I will be very happy of the rifles demonstrate 2MOA or better performance. I consider that to be roughly equivalent to the original 91/30 Sniper rifle's honest performance. The entire thrust of this scope mounting project is to permit a sighting arrangement that is readily adjustable, allowing a genuine zero to be established and adjusted for practical distances, whatever they may turn out to be.
The emphasis of this project has always been to provide a cheap rifle that shoots well enough to earn its way in the collection and at the range. This arrangement provides a relatively practical scope mounting application that still permits stripper clip reloads, not too unlike the K98 Mauser ZF-41 system. I would not venture to call the rifle a tactical implement or a sniper rifle, but I do believe it could earn a description as an improved vintage service rifle.
Base: $8.85
Rings: $15.95
Scope: $43.90
Total expense per rifle, including tax and shipping from Amazon: $73.49.
Until range results are in, it's still too early to call the project a success, but at least the costs are in line with the goals. Depending on the price of the 91/30, overall costs for the resulting rifle should run somewhere around $200-$250.
If I were to evolve this system into a 'Gen-2 Version', I think it could be successfully brought off using the short rendition of the base.
Amazon.com: Aim Sports M44/Mosin Nagant 91/30 Scope Mount (Short): Sports & Outdoors
Greg