If the next ball in the stack is cracking when hit by bolt loading the ball that is currently in the breech, a softer bolt impulse may avoid cracking, explaining the difference between markers perhaps.
Thinking along those lines, with a lower setting on the loader, it may reduce the tension enough to allow the next ball to be pushed back in to the loader as the bolt moves forwards to chamber the currently loaded ball - it isn't being forced down hard against the bolt.
I can't say for sure that that is the difference here - just thinking out loud. Choosing a lower setting may do the trick though.
It's just like a battle zone, you got a bottle and you're on your own.
Gotta be a Scotch or a Kamikaze, none of those other weapons will faze me.
Hundred, hundred, hundred bottles on the wall, you wonder if you can drink them all.
Got to go home by 1am, the bottle wins the battle again.
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