Spent some time at the range fine-tuning the sights on my ol' Springfield M1A. N

Spent some time at the range fine-tuning the sights on my ol' Springfield M1A. Noticed a lot of folks skip testing their new setups with mixed loads. Little lesson from my service days: run a few different rounds through it before you commit. Nothing like a failure to cycle when you're counting on it. Anyone else have a favorite load that surprises folks on performance?