I have been reloading for my .22-250 and have found it shoot well with a middle of the road load so not pushing it too hard to help preserve barrel life, have been using cci 200 primers with it.
Recently i have started reloading for my .308 with a 20" barrel. Velocity is always going to be a problem. I am loading 175grain Berger OTM with lapua brass and cci-200 primer and h4895 ( ideally would like varget but non local). The load data is 37-41grains as per berger. grouping were improving as the load went up. at 40.5 group was .5" at 100yard, and slightly better at 40.7 grains but primer began to flatten so stopped there. Are they other primers that people find harder and less prone to flattening? Know i will have to start low again and work up with the change. Will the change form vigin brass to once fired make much difference?
Reason for pushing velocity is that i want to shoot longer ranges when given the opertunity and would like to have a load that can do 1000yard if given the chance wich willrequire as much velocit as i can get out of the 20" barrel.
Have recently got a chronograph so can see what velocity i am getting next time i am out.
I also have a 150grain load with 39.7grain of H4895 that shoots well with lowrecoil for shorter ranges and keep cost of the berger otms down.