Grouse45

No, I did not try any .459/277's - did not have any with me but they will load just fine in this gun. It will tighten the sabot up a bit also.

The sabots that i was using were the old (very old) TC Red Mag Express. They were from back in the days when Harvester had the contract and they were the old style plastic. I am sure the HPH-24 or the Harvester Short Black will be a little tighter in the bore.