Re: scopes for Mosins
+1 for the Darrell scout-mount. A fella I know put one on his M39 Finn M/N and it has been solid. I've tried the "no-name" cheaper brands on my M44, and they sucked. I finally Acra-glassed one to the rear sight block, and that got it to hold. (I did some foolish things to surplus guns in my younger years that I regret now...)
I have heard good about S&K, made here in PA. They make a scout-mount style that has a weaver rail, or uses their proprietary ring system; you choose.
My one pet-peeve with the scout mounts out there is that the scope is set quite high on some, and I think a higher comb to the stock would help. The Darrel mount seems lowest to me.
FWIW, the scout scope marketplace has some really cheap models, then jumps to the Burris/Leupy fodder at $250 +. As it is, I scoped my M/N44 with an NcStar 2.5x, and it has worked quite well. Cost was about $50.00
Typical 5-shot 100yd. groups from my setup result in an average of 2.75" with WOLF 200grain SPs. Not great, but good enough to take a few deer with.