Thank you for the responses! I note that both "bonanza" & "500Nitro" cautioned me about loading a BPE with nito powder. In the Double Gun Journal they have a chap by the name of Sherman Bell who regularly writes articles on nitro for black conversitons for shotguns and rifles. It is this chap who recomended this load for a H&H Dominion BPE .577. This would be a "sister gun" to the one I am consdering. I have followed this chaps advise in the past and still have most of my fingers and one good eye (ha, ha). Comments gentlemen?