These breech plug vent liners are meticulously crafted one at a time, featuring a vent hole size of .033". They are produced using the "step-hole" method, which yields more consistent results compared to a single-sized through hole. On the primer side, the vent liner hole is larger for the initial .120" of depth, then narrows down to a .033" diameter for the remainder. This "step-hole" technique creates a funnel action and an expansion chamber, enhancing flame delivery to the powder while simultaneously reducing pressure from the primer.

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