About a week ago I was down in the Portland area shooting. Ended up spending a lot of time on the range, so I got to experiment with suppressor shift. Here's the rifle and I as phogographed by Titlest1 on other boards. I experimented with 75 gr factory loads and 75 gr reloads, as well as with 77 gr SMK reloads. I didn't expect to be spending time shooting from a bench, so i had brought only my 14.5" N4 with an Aimpoint T-1, and was shooting at targets that were not really ideal for shooting groups. No sandbags, just rested the rifle on some PMAGS and started shooting. I was able to document interesting results. Here's a bunch of rounds onto the bullseye. Consistent performance with what to expect from my batch of 75 gr PPU (Jan '09) And here is a similiar target but suppressed. Later, firing reloads I saw a similiar, but slightly more dramatic shift. Unsupressed Suppressed I later shot 10 rounds of 77 gr SMKs suppressed, and 10 rounds unsuppressed at the same target, thinking I could makes out the difference. However, the two groups were so closely spaced together there was no distinct space between the groups! The combined group of the suppressed and unsuppressed 77 SMKs would have fit inside the groups the 75 gr factory loads produced I'll upload those pics tonight. It definitely seems that 77 gr SMKs seem to resist suppressor shift better in my particular set up. Any idea why?