Brass Change/Charge Change?

[Brux]

Switching from Fed to Lapua.My fed weigh's around 176.5 and the Lapua weigh's around 173.5.Shooting 168's how much do you think my powder charge will change?

 

[Rprecision]

3 grains isn't too much to get worried about in a .308 class cartridge.

I would load up 3 .3 under, at and .3 over you current charge weight. Go shoot them in what ever method you subscribe too, I prefer the OCW method.

Take you results and apply it to your change. This usually works for me.

 

[Brux]

Thanks,my load is 42.7 varget with fed and it did not like that so I went .3 over and it did not like that.I have not gone under yet.

 

[TacticalBoltKnob]

Brux, the 3 grain difference in case weight is nearly nothing. After I have fired my Lapua cases about 5 times, the weight will often vary about 3 grains from the lightest to the heaviest, perhaps about 171 grains to 174 grains. You may need to up your charge weight by a tenth of a grain of powder, but likely your load will remain the same. Ammo temp and/or ambient temp may play a small role.