I shoot them out of a couple of my rifles. Normally with 80 grains of 2f and a wad under them. They do have some impressive down range power to them. Another bullet you might want to try since it seems conicals will be working in your rifle are the 460 grain or 495 grain No Excuse Conicals. They are still under the legal measurements for any out west hunting, they are very well made, very accurate in my rifles, and even with small powder charges of say 70 grains have tremendous power down range.

I shoot them out of my T/C Black Diamond XR and of course my White Ultra Mag. I have also shot them out of my Knight Wolverine LK-II. I never took the time to try them out of the Knight at long distances but at shorter ranges the accuracy was very good. They are a .503 diameter so they should load good. Of course no one can guarantee that out of your rifle they will shoot good, but they might be another option to try.