AQUATECH

Wellll, that is a difficult question, because it depends on the sabot and the sabot manufacturer.

It use to be that Barnes bullets came with a Hornady sabot or what might be an MMP HPH-12 sabot. The bore diameter that this was designed to fit is .507 to .508 with a .452 bullet. With a .451 reduce that .001.

The Harvester, if it isn't a TC Mag express, is designed to accept a .451 or .452 bullet. With a .452 bullet it will go down a .505/.506 bore and with a .451 bullet again subtract that .001.

The "crush rib" is thinner yet and will go down a .504/.505 barrel.

If you measure the outside of the sabot with the bullet insterted, not at the cup but at the petals it will measure something greater than these bore sizes because you need to squeeze the petals across and down the lands and down into the grooves to create rotation. Another thing that makes a difference, what type of plastic or polymere is the sabot and how plyable is the material.Of course the warer the sabot or the barrel the more plyable the sabot becomes, which is OK if the sabot does not skip by the grooves getting little or no rotation. That is why it can not be to loose but it does not have to be as tight as some are.

hope this means something to you - but this is my understanding...