I've patched for my buddy's Guide Gun and made it work. The crimp needs to be light so it doesn't cut the patch over the bullet. We've fired a magazine full and didn't see any evidence of bullets moving under recoil when we inspected the last cartridge. When working up our load and crimp, I started with two rounds in the tube and inspected after the first shot. Then, followed up with a few more rounds in the tube (memory fails me here). Good luck and let us know how you skin this cat.
