Just saw this on the Lehigh website

[GM54-120]

The 260gr 45cal sabotless bullet is now available for sale. When i checked out the prototype samples i had to rezsize the barbs with a cheap Lee sizer but the bullet body did fit in my tight .450 land to land bores no problem. Sized to .454 they need a nice wack on the short starter then they load pretty easy. The barbs/bands are .458 as shipped. A .454 die is a standard Lee sizing die, not a special order. They can be found for under $25 usually.
https://www.lehighdefense.com/all/458-controlled-fracturing-260gr-muzzleloader-bullet

 

[gle3105]

Glad you posted this info.
I bought a 25 pack to try. Ba jesus' do they shoot!
Just ordered 75 more.
Shot a rounded two inch 3 shot group at 200 yds. ( 7x max pwr scope) . With my astigmatism I'm happy!
Knight 45 1/20 , 120 grn BH029 Cheddite. bare priming.
Will be my hunting pill this year.