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When cast bullets are fired at high velocity they tend to lead the barrel, several things can be done to help alleviate this leading, the most beneficial is to apply a gas check to the base of the bullet. A gas check is a small copper cup that is applied to the base of the bullet, preventing the hot gases from the burning powder from contacting the alloy of the bullet.
There are 2 general styles of gas checks; the first is a slip on style that relies on friction to keep it in place, this style often falls off prior to hitting the target and some believe this is detrimental to accuracy. The second is a crimp on style that is applied using the sizing die and has small burs that lock into the alloy and keep it attached to the bullet, often through impact.
It is important to note that the cast bullet must be designed to accept a gas check, as there must be a rebated section on the base of the bullet. Also, the base of the bullet must be perfectly flat in order for the gas check to seat properly and maintain accuracy.
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