You could loop a piece of rope around the rear of each wheel to prevent them from rotating. Then the friction with the ground would lessen the recoil distance. Or you could use the chains, although they would tend to scarf the wheels more.
What is the charge? Since you have the muzzle end of the barrel, the twist is going to be the greatest. Since the GAU-8 is designed for depleted uranium projectiles, the twist is going to be a little less than optimum for lead, but my guess is that the standard projectile is longer than yours so that may not be the problem.
ďIf you're not a liberal at 20, you have no heart; if you're not a conservative at 40, you have no brain.Ē--Winston Churchill
Last edited by GGaskill; 05-08-2019 at 02:03 AM.