Gents,

What max velocity level could I get to in a 3" shotgun shell?
It would contain a 458, 500 grain slug. It would be loaded in a sabot.
The gun would would be the 870 Remington, with a rifled barrel.

Not sure if this post should have been posted in the shotgun forum, if so, feel free to move it.

Roger QSL

Where do you get the sabots to load
458 into?? I've can't find them.

Max Velocity about 15-1600 in a
regular weight 870 barrel. If a heavy
barrel like on NEF, 2000 with our slower
powder loads shown in 12GA FH thread.Ed

Ed,

Don't have them yet. Will pursue later if something better than 1600 can be done.
Have been looking at some of the new offerings by the ammo makers, and some of the loads are really hot. Don't know how there keeping the guns together.
If something in the 2k to 2150 could be done, and the 870 stays together, would make for a very interesting project.
Apparently, the new rifled shotgun barrels are quite strong.
I read quite a bit of what you have been doing and was curious as to the strength of the plastic hulls with heavy loadings.

Roger QSL

The plastic cases will take anything
the barrels will . We got 600gr over 1900
average in 3" and almost 2100 average in
3.5". Thats in thick barrels like NEf.
They are better than the balloonhead magtech
brass cases. The speed limit so to speak is
the thickness of the muzzle with our slower powder loads. If yours has a medium
alloy barrel you could get 1800.Ed

Ed,

These must be with the Savage, correct?
What's your knowledge of the 870?

Roger QSL

The plastic case loads were with NEF heavy
barrel. I don't know much about 870s,
or the alloys used in the barrels.Ed