awhile back I bought an optima v2. and then I bought a bunch of bullets, from a forum member from here,, mostly with sabots but some other sabots. I also bought some bullets and sabots of my own. all to do some load development. been shooting several different times. on my last shooting I tried a blister pack of powerboats. 348 gr. (green plastic). i loaded it the same as i have any other but this time after squeezing trigger there is a hesitation then bang. so i thought the flash channel needed cleaned with the drill bit. so i did. loaded another one up. did the exact same thing. I have shot probably about 80 shots all with different combos of bullets and sabots and have had NO other problems with any other bullets or sabot combos. any ideas why there was a problem shooting the powerbelts and no problems with any others? thanks for your time.