The guys are right on the Bill Springfield trigger job, that's all I'll shoot in my 91 and clones. And they are right again with the bullet weight, the 1-12 twist barrels usually like 145-150 gr bullets, a AR-10 with a 1-10 twist will shoot the heavier stuff but then this is a HK forum. I just shot some of the new Privi-Partizen 145 gr BT-FMJ and it fed very well even in my PTR and grouped extremely well for military ammo. I wanted to see what the ammo and rifles were capable of and fired them from a lead sled to take the Indian out of the equation. The PTR-G.I. shot it sub MOA and my HK-91 shot (8rds)- 1/2 MOA. I just ordered a bunch of it. With that quality of rifle, when you get the ammo, they're right, under non-hunting, ideal, slow-fire conditions it will shoot 1-MOA. I just got the PWS- flash hider/ muzzle brake from HK-parts and could not believe how well it worked so I ordered them for the other rifles that did not have it yet. Reduced recoil a bunch over the older style PTR Brake and cut the flash in the scope out. I could not believe it would do both but it did. Adam was right again.