Nope. They shoot well in my Genesis. Load is 100 gr loose Pyrodex RS. Works great on deer.

Does your rifle have a standard 50 cal bore? These bullets are supposed to work in "tight" and "loose" 50 cal bores. Let us know how they fly.

Here's some info - if you can get them moving around 1500 fps, you can sight in for 2.5 high at 75 and be about 3 - 3.5 low at 150. Zero is at 125.