50-70 advice

[acder]

I want to begin casting fro the 50-70 gvt. I have the lee 450 grain load and plan to use smokeless powder (unique) with a MV in the range of 1000-1200 fps. What kind of hardness am I looking for in an alloy-will straight wheel weights work? Thanks for the help.

[dubber123]

That boolit is very accurate for me. In fact it outshoots several other moulds costing much more. Air cooled WW's is likely all you need. That is all I have ever used, and my approx. 1,000 FPS. velocities were achieved in a 6-1/2" Contender barrel.

[Wayne Smith]

Straight air cooled ww are adequate. As long as you stay around 1000-1600fps you may even be able to go as soft as half ww and half lead. Although, with a boolit as big as a .50" you don't really need expansion!

[DonH]

For the velocity range given, you can go as soft as 30-1 lead/tin with no problem unless your particular barrel just doesn't like it.