Thread: Accuracy troubleshooting suggestions?

Good Day,

Kimber Montana .308, 18” w/DPT suppressor shooting Hornady SST 165 gr., 2700 fps, 200m zero (per sight in at 100m range at 2.8 inches high).

Was shooting at a target recently and was about 19 inches low at 350m, decent 5 inch group (shooting off of crossed tramping poles and my day pack under the rear arm). Did not try dialing to correct, but 19 inches low (or 3.9 moa) was correct according to my ballistics app (shooters calculator.com).

I then added a DPT muzzle brake (replaces end cap), a stainless blast baffle, and one more alloy baffle. Recoil is massively reduced, can pretty much stay on target after shooting even at 15x.

Last night I’m out on the hill, stalking in on a mob of 4 yearlings across a gully, when one spots me. I sat down in the tussock and ranged it at 335m, and figured it was a good opportunity to try a longer shot (almost always stalk to within 200m). Dialled 3.8 moa. Clean miss (son thought it may have been low but wasn’t sure). Two more shots before it ran off, both misses. Again, son thought they were low.

Should I re-chrono? Did I miscalculate moa? Would the two extra baffles and muzzle brake change (reduce) muzzle velocity very much? They didn’t significantly change point of impact at 100m, maybe 3/4 of an inch higher, but I haven’t tried shooting at distance (hard to get access to the farm with the 350m target).

Any other suggestions?

Thanks!