gunnerb

now my problem is getting primers in USA ,stores can't get them with what is going on over seas

Large Rifle primers. I am experimenting with Federal 210M and CCI primers. What is the twist rate in your rifle? Asking because many people with a twist rate 12 and over have difficulty in getting heavy bullets to shoot through such a slow twist rate as 12:1 and 13:1 In my experience slow twist rifles favour the lighter bullet heads. If your twist rate is something like 10:1 then you should have no problem with the 107 gr heads H414 is a popular powder for the .243 Peter thank you that at least gets me in right direction.

I'm new at reloading rifle cartridges.what size primer for .243win. I'm using 107 sierra bthp for whitetail and not sure about powder.