243winxb
Member
The PSI & alloy BHN of your load determines when a Gas Check is needed. A fast burning powder can peak pressure to high at the start deforming the plain base bullet. A slower powder will give the same velocity but with less peak pressure. A gas check can just withstand more pressure. Lee's chart gives you an idea, but IMO is not totally correct. Lymans #2 alloy at a BHN of 15, would seem to handle all normal cast bullets loading, rifle and pistol when staying with in certain PSI ranges. With all this correct, you still need a good lube applyed correctly, that worksSo for a 100% hard lead (clip on wheel weight) projectile pushed to about 1600-2000fps I will need gas checks? I thought that they were only need with a softer lead composition.