There's a reason Powerbelty remains #1 after multiple decades. There's no need to say anything more, for if they didn't work, they wouldn't be #1 / #10, or probably still in business.
Last December I sold my last CVA sidelock to a pawn shop for $45. Bass Pro had a massive sale on this ML around 2003 for something like $39.95.
I got choked-up when handing over the ML to the Pawn Shop owner. For that cheapest out-of-of-pocket and cheapest quality ML was the most accurate ML I ever owned.
I began toying with Powerbelts last month..... got them for 90 cents a-piece. Using the bigger ones-only..... 405s and 348s. Put a fiber-wad behind them and 70-80gr of Blackhorn delivers superb accuracy. The soft pine tree imprints are no worse than with my SSTs, XTPs and Expander sabots. I plan on using 348 copper HPs and 405 lead HPs next hunting season.
We don't need el-primos to harvest deer.