Shot 110 gr Sierra Pro Hunters in my 270 Win yesterday. Factory Ruger American, Winchester brass, Fed 215 primers, and Rl 17 from 55.5-61 gr, moving in 1/2 gr increments and 3 rounds per load. Had some pretty impressive groups and some pretty impressive ES/SD’s.... unfortunately not on the same loads. I know I’m not an accomplished shooter, so this makes me skeptical regarding my groups (when my numbers are good). On the other hand, all powder is measured in an RCBS chargemaster, and I’ve read here that between the given margin of error with this scale and the “rounding up” I could be off 1.4 gr (I’m not currently double checking wts on a 2nd scale). Also, I’m not alway convinced my Caldwell chronograph is reliable...I’ve gotten readings at <1000 FPS up to almost 4800 FPS. This makes me skeptical of my numbers (when groups are good)...in my shoes, would you explore the better groups or the better numbers? Thanks.