The only issue I've had is the fletching, it's built with very fine thread, they get pinched and pulled by the probe on my Challenger breach -"messy". I started using these with better results ...I've even !!hunted!! with these: squirrels @ 15 yards.
I have some traditional style with the brush, quite loose fit in the bore... will need a dedicated barrel for shooting these! Is the plastic the largest diameter on those, these I have got is the metal touching the rifling-not good