In preparation for my upcoming elk hunt, I took my Rem 710 270 out to sight it in. I started off at 100 yrds with Remington 150gr. Corelokts, got a VERY tight group(one ragged hole in the paper). Moved back to 200yrds and was still getting a tight group. Switched over to the Federal Premium HE bearclaws that I' m gonna use on the hunt. I went from a group to a pattern. I was all over the paper. I got discouraged and gave up for the day(had a hurricane coming and needed to finish getting ready for that too). The Federal has a lot more kick to it than the Remington, I' m thinking that maybe since my shoulder was starting to get sore that I was flinching. I was shooting from a bench rest. Should I give the shoulder a couple of days to stop aching and try again? There shouldn' t be that much differance between the ammos should there? It' s a little discouraging to go from a tight group to a big ole pattern. Please help!