Not sure about those but give them a try and see. I have used some Powerbelts with good results and I like the No Excuses and Bull Shops conicals with good results. The 1:28 twist works very well with medium to larger conicals. The tighter fitting ones may give you trouble if they don't line up straight when started into the bore. The slip fit conicals like the NE and BS line up easily and, for me, shoot well. Good luck with it.
I have a cva with a 1in32 twist that I shoot lee real bullets with. This bullet is cast from pure lead and drops at about 325gr. I use 100 gr of loose pyrodex rs and it performs well. I have lubed with liquid alox and also with natural lube 1000 with good results.
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