Safe loads for 'improved' Gahendras and Brit MHs?

Hello all. Posted a few pics of my 'improved' Gahendras a while back, and would like some imput on this. Would really like to shoot these rifles a few times, (not repeatedly, just to say I did!) and was wondering what a safe load would be after having the bores slugged. Powder wise and all that. I understand that if one is contemplating firing these rifles, it's best to shoot the improved versions rather than the original ones. Also, what would be a safe load for British MHs? I have a 1887 Mk IV, and two Mk IIs. All from the Nepalese cache, and all in very good condition, so my gunsmith says. I'm a bit of a newbie inasfar as these rifles go, and would really like to put some rounds through them. Was wondering if anyone out there had a recommendation for me, particularly the Gahendras. Thanks a lot.

For the all the rifles use the LoC load. 85 grains of Fg use a card wad at the bottom of the neck, add a 1/2 in beeswax scrubber and two card wads, the 480 grain bullet.

For the Original British rifles you can use a.468 diameter paper patched or grease groove bullet. for the MKIV you will get even better results with a .470 diameter bullet

For the Gahendra you should slug the bore and see what you have and use bullets of that appropriate size.