I shoot them out of a custom .308 , lapua brass , 210m primers , 28" Bartlein 1:11.25 twist HV. I found that because the bearing surface is so far back that I have to load them WAY past 2.880" (AI MAG LENGTH). But with 42.2 grains of varget I've gotten GREAT accuracy with no over pressure. I think my oal was 2.930". Shot in the 1/2 minute range very easily