The BRI Winchesters and Federals are plenty accurate from my USH and 870 rifled, 1" at 75 yards.
I've shot four deer with them, three dropped at the shot because the spine/neck was broken.
One small doe was hit three times, ran a hundred yards, all shots were solid hits, blood trail was quite good, but recovered slugs showed no expansion at all.
It's an accurate but rather slow bullet and quite hard and not really designed to expand.
Frankly I've not seen any better performer on game under 100 yards than the reliable 1 oz. foster.
I have recovered fosters that were flattened to over an inch.
But even the foster can be problematic.
I've had two failures to penetrate after striking large bones.
I think those shooting full bore slugs would do no better than the Dixie loads in smooth or rifled bores and Hammerheads
(hand loaded) in rifled bores.
I'm new to the Hammerhead so have no field experience with them but range results are solid with groups running 1" at 75 for 5 shots from a USH and velocities of over 1500 for the 1 1/4 oz powerhouse.
No leading from the Hammerhead, dead nuts accurate, more power than needed and the thing should not break up on bone.
My tests reveal that they should even expand well. Not that you would need expansion with a .73 cailber 1 1/4 oz bullet.
Sabots still leave a lot to be desired in my humble opinion.
The accuracy is not there in my 870 rifled or USH. I can get three shots out of five touching but two almost always group outside and leave me with 3" to 5" groups at 75 yards.
So why would I pay 3 bucks a shot for groups like that?
The Hammerheads can be loaded for about 1/3rd the cost and performance at the target is stellar.
The Dixie can be purchased for half the price of wonder sabots and you get the benefits of a .73 caliber bullet that will not break up on bone.
Contrary to some claims the high speed wonder sabots do not make the average 12 bore a 200 yard game getter.
So if we must stay within reasonable ranges of up to 125 to 150 yards and you want solid accuracy, what is wrong with a full bore bullet at respectable speeds with more slap'em down gee-whiz than required for the biggest buck in the woods?
If we are shooting a 12 bore then why not take advantage of the fact that we are shooting a .73 caliber RIFLE
capable of hurling even gregs giant 880 grain solid at over 1100 f.p.s.?
DO NOT shoot the 880 grainer unless:
1) you are very experience at handling a heavy hitter
2) you have someone with you at all times to render first aid
3) your medical insurance is up to date
4) you are not suspectable to concussion
5) you LIKE great bit bullets!
I really, really, want a 550 to 600 grain hollow base, hard cast, .734" bullet to handload.
The Hammerhead comes real close to this but in a plastic wrapper called a one piece, non-discarding sabot.
I've read that some good bolt action s.g.s shoot the hi-speed sabots really well but have yet to see any posted, repeatable, good groups at the fabled 200 yard mark.