Lapua Brass capacity compared to Winchester brass? Reduce Powder?

[Losthwy]

I been told the Lapua has thicker brass thus holds less powder than the Winchester brass. Should I reduce the powder if so how much (%)? Loading .243 Win and .30-06.

 

[TheSnake]

I know this is not what the answer you are looking for but I would say reduce by 10% and work your load back up to where you are now looking for high pressure signs. Changing the case will change several things like case capacity and neck tension and that could change the pressure for the worse.

 

[bozo699]

I know this is not what the answer you are looking for but I would say reduce by 10% and work your load back up to where you are now looking for high pressure signs. Changing the case will change several things like case capacity and neck tension and that could change the pressure for the worse.

May not be the exact answer he wanted but very sound advice indeed!
Wayne.

 

[Losthwy]

thanks for the info.