Let me start by saying I am not a fan of pellets. I like fine tuning a load and like the flexibility of loose powder. I obtained some white hots as part of a good powder deal. I have shot them in an NEF Huntsman using the Metrics Unlimited breech plug. I had no problems igniting them using a Remington STS 209 primer. I wanted to see how many shots I could take without swabbing. The seventh load would not seat due to the heavy crud ring. It did not even come close to the accuracy I get with 90 gr FFg T7, 250 gr .452 XTP using a Harvester smooth black sabot. Not a glowing recommendation but that is my experience so far with them.