This thread made me wonder about my Polish build Vector, 7.62x39.
I've had this thing for about 4+ years now and the only accuracy checking I've done with it were 20 round groups at man size silhouettes at 100 yards. If it stayed in the black that was good enough for me. No benching with this thing, though I do regularly shoot the 200 yard gong with it on the table.
So this morning I took it out and used the bag set up I use with my mil surps for load testing. I do not load x39 though so this test was conducted with 123gr BrownBear HP.
First group of 5 went 6+ inches. 3 @ 2.25 inches, 2 pushing it open to 6.
Second group of 5 again 6+. 3 @ 3.75 inches, 1 pushing it open to 6, and the other hole nowhere to be seen. Here's the interesting thing about the missing round... The rifle slam fired on me!
Very strange, something I've not ever experienced with this particular rifle. I was slow firing and noticed a tiny bit of gritty on the pull right before the hammerfall. ?? The trigger is double hook design.
Stopped slow pulling the trigger and experienced no more slamming.
Third group put 5 @ 4.375 inches.
Fourth group another 5 @ 4.125 inches.
Last 5 rounds of the box were shot at the gong.
Gave a good 5 minutes between groups to cool the barrel a bit. Was only in the 50's here this morning.
I checked "around 4 inches" for the vote, though specifically I would call it a between 4 and 5 inch rifle @ 100 yards.