There are many things you can do to to a Mosin to accurize it w/o messing up the original parts. Brass/aluminum shims, cork gaskets under the stock etc. (ebay Mosin Shim kit)
Even the way it shoots high, you can (my favorite trick) put a piece of heat shrink on the front sight then clip it shorter to adjust elevation so you can get a 100 yard adjustment.
Unless you find the unicorn clean un pitted bore (Took me 8 mosins to find mine and I think I'm lucky), you will lean the term "Mosin Clean".
Much of the commercial PPU ammo although valuable cause its got reloadable cases, have bullets that are undersized Tulamo is closer to old corrosive surplus which sometimes shoots better than PPU and Tulamo. I reload for mine with brit .303 bullets which are .311 and get excellent results with ANY of my mosins although some shoot better than others.
Just know, that pretty much ALL mosins went though a refurb process and were pulled apart then parts re numbered and matched again.
I have a Mosin 44 that "may" still be in original parts , not sure, but all the other "Common" surplus rifles indeed were factory refurbished, not unlike the Russian K98K rifles or most M1 Garands (Garands just may not have been messed with as much).
Even the way it shoots high, you can (my favorite trick) put a piece of heat shrink on the front sight then clip it shorter to adjust elevation so you can get a 100 yard adjustment.
Unless you find the unicorn clean un pitted bore (Took me 8 mosins to find mine and I think I'm lucky), you will lean the term "Mosin Clean".
Much of the commercial PPU ammo although valuable cause its got reloadable cases, have bullets that are undersized Tulamo is closer to old corrosive surplus which sometimes shoots better than PPU and Tulamo. I reload for mine with brit .303 bullets which are .311 and get excellent results with ANY of my mosins although some shoot better than others.
Just know, that pretty much ALL mosins went though a refurb process and were pulled apart then parts re numbered and matched again.
I have a Mosin 44 that "may" still be in original parts , not sure, but all the other "Common" surplus rifles indeed were factory refurbished, not unlike the Russian K98K rifles or most M1 Garands (Garands just may not have been messed with as much).