Pistelle X-68 Bore Size or Barrel Length… Which is more important?

In this video we test the Smasher projectile with a Pistelle X-68 with 3 different barrels. We want to see if bore match or barrel length is more important for muzzle velocity and energy generated (Joules).

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Ammunition Testing,
Upgrades & Modifications
Pistelle,
Pistelle X-68