Michael,
I don't remember if I sent you those Sierra 155's or not. A few notes about them: Most of them are shot out of 30" barrels. The Sierra 155gr. Palma has very short parallel sides. Typically it is shot in 1:13 twist. In sporting rifles the results are usually great, as are yours, in a particular rifle. Or lousy. They shoot pretty good out of a 30" .308 1:13 Krieger in Lapua brass, with 46.1gr. of Varget and a Winchester LR primer.

Gary