Fit a lapco autospirit real well. Otherwise any midbore .686 to .688.
Round. Bright fill. Now gook in the bags.
Shells are thick.
Shoots well in all of my markers. Haven't had a breech break yet. No dimples. Good rec paint. Might be too tough to play tourneys with though. Will likely bounce at longer ranges. Won't be a good fit for large bore barrels, so test the out for size first.