Hello, I've had some troubles recently regarding slug accuracy. I have a benelli Supernova with a muzzleloader bushnell trophy scope. I can only seem to get at best 5" groups at 100 yards (shot from a lead sled). Even though I am using 2 3/4" Federal premium sabot slugs, the Supernova also comes with a rifled barrel (ofc). Are there any better suggestions to improve these results? I also saw a Savage 212, a bolt action 12ga slug gun. I want to know if anyone has any answers on the accuracy that gun has with what loads. Thanks!
I may be a little confused, are you saying your Benelli has a rifled barrel, or has one available? If the barrel isn't rifled, or has a rifled choke, a sabot isn't going to get any spin to stabilize. By the same token as some others have mentioned, you may need to try some other offerings, as far as different brand or type of sabot. Just as rifling twists rates can have an effect on which weight or bearing surface length is more accurate in a rifle, can also influence a rifled shotgun bore, or even a rifled choke. With the use of a scope, for a consistent aiming point, a 5" group at 100 yards seems a little poor to me. That's more what you would expect from a smooth bore with a Forster style slug.
If your shotgun HAS a rifled bore, try some other offerings, if smooth bore, get Forster style slugs.
Good Luck, in getting it figured out before next hunting season!