TNHagies
Should check with Sabot loader on this but if I remember correctly he uses a small mag rifle primer in a 2520 case on the adapted breach plug that Precision Rifle sells which also eliminates blow back.
I am interested in this myself as they have come up with a set up that uses large rifle primers, I may try that in my Omega my Triumph has no blow back any way so it is not needed there. Must make a choice between selling the Omega and buying an other Triumph for a back up or going to the case in breach plug method which is illegal here. Lee