ResearchinStuff
WKR
The two worst were a 1-8” 243 and a 1-8” 223.
In the 223 I’ve tried 4 bullets. 53, 62, 73, and 75 grain. 4 different powders. I’m lucky if it will shoot 1.5” with the best loads every 10 shot group. But it’s good enough for practice. The 62’s and 75’s were around 3” groups.
The 243 was sorta better. 6 different bullets, 3 powders to get it under 1.5” consistently. It ended at 1.1” for 10 shots.
I had a lousy factory 223 barrel too, averaged over 2 moa with 75 hpbts, m193, and 77 tmks. replaced it with a PVA, and that might also be a lousy barrel, though it did FINALLY print its first ever 10 shot sub 1" group the last time I took it out, with nosler 77 hpbts. I sold off all the 75 bthps I was using, traded into some different powder, trashed all the brass, and once my new press gets here will be trying 77 tmks with benchmark and 8208 xbr. fingers crossed that it'll finally equal or beat my tikka 6.5 creed barrel.
the one combo that i have never heard of subpar accuracy from is a tikka 6.5 creed factory barrel. those seem to inevitably do 10 shots in 1.2 moa or better.