Load Dev. w/ New Primer Brand

[bill123]

I'm shooting a .308 w/ 45.8gr Varget, fireformed Lapua brass & BR2 primers. I have gone as high as 46.8gr Varget w/o pressure signs but get great SD/ES with 45.8gr.

I would like to test Tula primers and understand that I should reduce my load to start out with new components. My question is, how much? Since I've never gone above 46.8gr, I have to assume that's my max load. Do I reduce by 7-10% from that and shoot one round each of increasing .1gr loads until I reach my 45.8 target load?

 

[g0rd0]

I would not loose sleep over reduceing a load because of a primer unless it is from a standard to a mag primer. And at that I would only educe by 5%

 

[bill123]

I would not loose sleep over reduceing a load because of a primer unless it is from a standard to a mag primer. And at that I would only educe by 5%

Thanks. You saved me a few rounds.

 

[JesseJames]

I personally wouldn't reduce it at all if you are just changing primers. If you were right to the nuts and were showing signs of pressure I would, but it sounds like you have a little safety margin in the load.

 

[BountyHunter]

Actual pressure tests (not QL guesstimates) show differences in standard primers can raise pressures up to 7k psi.
Be smart drop 5-10% and work up.