So I bought it last week, 12bore over .222, built in 92 but sold new in 2007 and taken back when owner lost his job
in early 2008 or so the shop tells me.
I bought the proper Kozap Q/D scope mount for it at the same time, at a horrendous price
I then set about loading some ammo to try it out, tried 23 grains of benchmark under a 50 grain Nosler BT.
Then the first problems showed up, badly smoked case neck and at best 2 holes (from 5 shots) in a 4 inch square target card at 100 yards.
Then tried 22 and 24 grains of Benchmark, no change, tried a different scope, a Swarovski 6x42, known to be good, no change.
Then tried Vit N-120 and several makes of 50 grain SP's and various charges from min to max, finally managed to get 3 from 5 on the card.
Bore is clean, crown looks good, gun locks up tight, shoulder is not blowing forward enough to suggest problems, but case neck stays sooty.
Can the collective think of anything else I can try before returning the gun to shop and trying to get my money back
Oh, tried full length sized once fired Sako brass, then just neck sized, also tried new PPU brass, as is, neck sized and full length sized.
Also tried loading to standard book length and .010" off the lands, crimped and un-crimped.
In desperation I also tried a few various factory loads, no better.