Just loaded 100 rds from my latest lot of Gallant 147 gr bullets. Same load and COAL as my last… 5000 or more.
But these seem to be tumbling- making oblong holes in the target about 20% of the time. The holes have a black oblong mark on one edge of the hole (the bullets are coated in black polymer).
Any ideas?
Would smaller diameter bullets do this, because they wouldn’t fully engage with the rifling in the barrel?
I don’t think the barrel is shot out, as it only has 15,000 rounds through it, and the other 80% of bullets fired seem to track straight and make round holes.
I’d appreciate any input.