Did an informal pole here years ago and most of the HK91s and half the SR9's were reported to be in the over an inch and under two inch range at 100 yards (the other half of the SR9s were a little under an inch). One of the better "cheep" ammo back then was Federal Red Box American Eagle 147 FMJ, which has worked well for myself. Similar to Blitzkrieg, I have not had that good a luck with Federal Gold Metal Match 168gr nor the USGI 168gr ammo (M118 pre LR). I was getting a good under 2MOA with the four power scope and PSG1 trigger pack, and actually averaged a tiny bit under 1.5 MOA for 3 shot groups with the Federal AE ammo. My two SA M1A's (neither one glassed, one standard weight and one heavy barrel) would not average as good as the HK91 (maybe better on some days and worst on others ... with a 10 power scope) - thus both are gone (in part due to reliability issues that never could be corrected). The one AR10 (not a T) was very close to the HK91 but was from the rough chamber era so the friend I got it from traded a couple years later and made it a SBR.
Some of the HK91 have a rough bore after years of not being cleaned and/or being sear hosts, some of them just need a little TLC to remove years of copper and some of us need a better trigger (this is shooter related more than gun ;-). If you want really little groups would start with a Rem 700 PSS and aftermarket trigger, one of the custom rifles, a Sako TRG or if you have too much lunch money burning a hole in your wallet a nice AI (at this point can start to consider a PSG1 again ;-).
Some of the HK91 have a rough bore after years of not being cleaned and/or being sear hosts, some of them just need a little TLC to remove years of copper and some of us need a better trigger (this is shooter related more than gun ;-). If you want really little groups would start with a Rem 700 PSS and aftermarket trigger, one of the custom rifles, a Sako TRG or if you have too much lunch money burning a hole in your wallet a nice AI (at this point can start to consider a PSG1 again ;-).
