I bought a Rem SPS 20" Tactical, w/o the threaded barrel. I started the break in with Rem. UMC white/green box 150s not expecting much. I did the usual shoot 3-4 and clean etc. At about 15 rounds things got better!
I moved the target back from about 50 yards to 100 and changed to Federal 180 Gr. soft points. After allowing for the bullet weight and the additional recoil, I thought I was seeing things. I shot a group around .33" and another at .50. After letting the barrel cool, I went back to the cheapie 150 gr. Rem. UMC's and after getting it together with my trigger pull, I shot another .5 or less group with cheap ammo.
Needless to say, I am very pleased. The trigger is virtually w/o creep and breaks cleanly and can be adusted down a bit which I will do. The Nikon Monarch 5-20 is perfect for the rifle and I am believer in what a short barreled rifle can do.
I should mention that it shot almost as well at 200 yards. I had one group with good ammo just under an inch. 200 yard was the limit at the quarry but what the rifle did on a hot day, over a truck hood was phenominal!