I do not have a VEPR but I do have the Standard Manufacturing SKO as well as the SRM 1216 mag fed semi auto. I am really loving the SKO (over the SRM 1216) and am currently using it for 3-Gun matches. I purchased it for 3-Gun because I really like keeping the rifle and shotgun platform the same. Transitions are seamless. I have the same optic (Trijicon MRO) on both my AR and the SKO. The 10 round mags work great and fit nicely in TACO Pouches. It runs great with all of the slugs, #7 shot, & 00 Buck that I have tried so far. The manual says the SKO will run fine with cheap underpowered Walmart special AFTER you have broken it in by running at least 4 boxes of shells with velocities of 1,200 fps or more first. Since my SRM 1216 only likes shells with velocities of 1,300 fps or higher I have a big stockpile so I haven't gotten around to trying the low powered stuff.