Don’t think less rounds in the tube means less force on the cartridge.
A factory gunsmith educating me on tube detonations explained to me that the initial recoil isn’t the problem. The bullets simply compress the spring “forward” (yeah, really the tube moves back and the bullet stands still...but...). The worst happens when the spring returns the bullet to the back of the tube and it hits hard metal.
He explained kabooms are most likely to happen with two in the tube. It can’t happen with one, and the spring dynamic is less with more rounds compressing the spring tighter. Made sense to me.
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