Gas Check Boolits without Gas checks ???
If your bullet is sized properly for your gun,
and if the pressure is sufficient to obturate the bullet per the bullet hardness.
Is there a need for a gas check? Even at elevated velocities?
From what I have been reading, I suspect the answer is, or could be no.
Although I also suspect powder burn rates may play a role in determining whether a GC is needed. Maybe it is simpler to use a GC and not worry with all the variables.
Please help me understand.
Obturation is Not Wanted Or Needed
Lee wants the pressure below where Obturation would happen. http://www.realguns.com/archives/118.htm Compare the pressure listed here for Obturation to take place.http://en.wikipedia.org/wiki/Obturate If a cast lead alloy bullet Obturates, it will deform and break down, leading the barrel. The structure of the bullet will be changed when jumping for the cylinder to the forcing cone. Not so much change will take place in a auto fixed chamber firearm. Bullet's BHN x 1422 = Pounds per square inch.
Quote:
According to the chart, a very popular #2 alloy carries a 16 BHN, has a strength indictor of 22,703 PSI and should be limited to 20,000 PSI as maximum pressure. Wheel weight alloy with a BHN of 9 carries a strength of 12,748 PSI and a MAX pressure rating of 11,473 PSI." You will need a gas check if the pressure is to high for the lead alloy your using. If the bullet is designed for a gas check, use one.