7.62x54 for shtf

I got this PSL kit I'm about to build. Anybody got experience with them? Im not looking for suggestions on getting other rifles, just interested in what people know of these rifles. I figured it would be a good counterpart for my ak build.

Anyone here have any experience with the Mosin-Nagant rifle? A buddy of mine had one several years ago. We fired off a few rounds one day. The rifle seemed like it was well built. For the price, seems like it would be a good buy. And what about the 7.62x54R cartridge. From what I have seen...