I will add it here again for those new to reloading the 460.

Extraction is the best guide to operating under the the design pressure of this cartridge.

Do your load development with clean chambers and extraction should never be sticky unless you are near over pressure condition.

The max load data you see printed is not an absolute but a guide line. The tolerances of firearms vary widely. I have several 460s with tight throats and max loads are 2 full grains lower (depending on powder) than the average in my collection.

Always work your way up.

be safe and good luck
Ruggy