About 1" length. The old Barnes 325s would shoot but i had to shoot them pretty fast for the best groups. Those bullets are just under an inch long. Best bullet ive found is the Speer 50 325gr JHP. Excellent bullet for the 54cal 1-28. I never had as much luck getting the Barnes 45 300gr Expander MZ to shoot good in any 1-28 but shoots fine in a 1-24. That bullet is just over an inch long.