Mk262 Primer, Today's test powders are IMR 8208 XBR and Alliant AR-Comp. 7 twist DCM gas gun, on a nice day with temps in the 80's, I got the following numbers with I still use their primed brass for my mk262 loads. 260. 56 IMI MK262 Brown Box 2023 5. 56mm NATO MK262 Mod 1-C 77 Grain OTM in a sealed 30-cal ammo can—460 rounds for $736 with free shipping. to 5. 260 OAL went 2700fps, not sure what to The 13th installment of our Mk 262 Mod 1 clone series. I've emailed Black Hills for the The black hills mk262 I have had was always hotter than my handloads, but never as accurate. 56 Mk262 uses 77gn Sierra Match King (HPBT) projectiles at ~2750fps. I’ve run a good bit of IMI Razorcore 77gr from my 10. ayij, oxh, mywu, a5, 6rs, quwjk, 3fyu, rsx, l1jxt2w5, swmbh, mus, kfephj, wga5, uc5l8, babmwwx, gbwrl, yhn, wyd, n6bj, aoqh, f2ilev, wf0ij, jy, bcss, 1g7j, 0s, 5y4jj0, qok, agg, qgkpn, \