Glad to hear of your success, Yogi000. While I prefer solid round balls with BP load duplications in smokeless, the Brenneke loads do sound most interesting.
; While I used undersized .684" balls in my 12 bore double (.725" bores) I have a .722" mould by Jeff Tanner and some ammmo loaded for testing. I think a .730" mould would cast about .728" and they would be better yet, and breech the 600 gr. weight.
: Thanks for noting the shot-cups as they sure smartened up my ammo. I was able to hold in 10" at 100 yards (offhand) which makes for easy moose and elk taking and perhaps 80 yards easily for deer.
; Sights are mot important - you need good sights for sure. I had mounted a 2-1/2x to 8x scope on the rib for testing purposes at well. Having a good sighting system eliminates most sighting errors.
; When I get around to 'sighting' another shotgun, I'll 'google' Express Sights and pick a single leaf sight with point blank standing sight. That will give 2 ranges, 50 yards (point blank) and 100 yards as max. Another method is to have the wide "V" of the rear sight with the 'ears' the proper height for 100 yard elevation. This then uses only a single Express sight for both ranges.
; I do not agree with the idea of greatly reducing one's power by shooting .50 cal. bullets from a .73 calibre gun. Even in the rifled bores, one should experiment with elongated full size projectiles as well as round ball loads. The ball, if of WW metal, will smash both shoulders of a moose - good enough for me.
: Check Lyman #2 or #3 shotshell book for loading data. Anything over about 1,520fps duplicates the heaviest African load for the 12 bore - a full 7 dram (191gr.) charge of black powder. 1,350fps replicates the lighter loads used in Cape guns and lighter shotguns.
; These loads make the very best camp-gun loads for grizzly - better than ANY centrefire of smaller bore. This is for solid projectiles only, be they slug or round ball as hollow projectiles have reduced penetration.
: Enjoy real power.