Hi, DS! Have to say don't pay attention to my English - it's not my original. Have some experience with Vepr 54R (around 800 or so rounds with different ammo, usually Russian/Bulgarian surplus $0.20/r).
Nice gun, well made, need some FCG polishing job and you got nice pretty accurate rifle. Fun to shoot. Has heavy recoil, that's why I'm in the process of putting the muzzle brake on it (I got really good groups improvements with Mosin91/30 with AK-74 style muzzle brake: 300y, iron sights, yugo brass cased 182 gr ammo = 3.5''/4'' group). So, back to the Vepr - this gun designed for steel case ammo, even sniper's round designed for the SVD is metal cased. I fired with different brass and results are: Chinese 148gr - accuracy is so-so comparable with metal cased surplus, but casing rim a little bit smaller, and as result problems with extracting; Bulgarian 182 gr - pretty accurate, but problems with feeding - approx-ly 20% got jammed in the battery entrance (see picture); Yugo 182 gr - I love this ammo, very accurate, but very corrosive (have to clean the gun right after shooting at the range, although not necessary - main components are chrome lined), but see results (picture) - speaks for itself! Nothing wrong to feed this gun with copper washed surplus ammo - very slightly corrosive, no FTF/FTE at all (I use ammo made in1974/76) - cheap and fun to shoot. If you gonna by it you won't regret! Need to say, this gun very sensitive for the front point of handling, which changes groups greatly. I saw many guys keep that guns under the lower hand guard - very wrong!!! You never get good groups in this manner. Take a look at the picture on (the left) forum user "luquidmetal" (1 post above yours) - that guy shooting SVD keep his left hand under the mag - in this kind of handling you'll get best results. It's all about harmonics of this rifle. Regarding accuracy - it's not super accurate just because of very heavy bolt carrier (the less weight ratio between bolt carrier and bolt itself the more semi auto rifle is accurate). RPK platform guns (read Vepr) got biggest ratio (heaviest bolt carrier) among semi autos. Another "con" about ammo - if you gonna reloading for the Vepr, don't waste time and brass. It's coming out dented (picture). I don't do reloading at all (yet), but on my opinion brass coming out from Vepr (or other AK platform rifles) too dented to be reloaded. P.S I just recognized that I don't know how to attach pictures to my post. Anybody please give me detailed explanation - I'm 54 years old and not so good with typing and comps.