Triple, my complaint is I could only get accuracy with 85-90gr of pyrodex and had to use 11 caps. I could get 2MOA accuracy. Anything pushed beyond that or with winchester 209's, and accuracy would go to crap. I just don't like a bullet with limitations like that and especially with that cost.
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That's not the fault of the Powerbelt copper hollow-point. That's not a performance issue with the bullet itself either. Powerbelts were designed prior to 3-pellet use in muzzleloaders. 120-150 grains was never Powerbelt-intended due to the integrity of the plastic cup/base. Many folks using 110-120 grains with Powerbelts load the cup with Bore Butter to substantially reduce blowby & maintain accuracy.
Also... depends on the rifle bore diameter too! Knight Rifles are overbore.... not a good choice for Powerbelts in those rifles unless you slow the bullet down first. Using 348 & 405 gr Powerbelts in Knights seems to work best.