Non-gas checked bullets are usually very soft, meant for black powder shooting.

The size is smaller than I like - but they've all done well with .459".

A full case of trailboss should run about 15 to 17gr. The pressure will most likely be up around 30,000psi, but the velocity, below 1,200fps. Trail Boss's presure production is out of line with the velocity it produces, btw.

At that pressure you can easily be driving the bullets to 2,000fps using other powders, which may give better overall results.

You could try putting a .45 cal wad between powder and bullet to take the place of the gas check. I have alsop used plain based bullets, with a gas check seated cup-down on the powder, then the bullet, with perfect high speed results.