Yup, I remember reading that. My .448" swaging die is on the way so I'll make up some 270 gr, PP bullets and I'll shoot from a standing rest and see what happens.
When I first got the gun a month ago I loaded two cartridges with 300 gr, .458", grease groove bullets. One wad between powder and bullet and crimped. I needed 126 grains of Swiss to make it to the base of the bullet. Now, I have to confess that one cartridge I loaded with 1 1/2 Swiss and the other with 3F Swiss. This was before I found and read some original instructions for loading an A Henry 450 BPE 3 1/4 that said DO NOT USE THE FINE POWDER. Oh well. At 20 yards the bullets almost touched but again it was off hand so who knows. I do know the 3F kicked more. The lands got leaded towards the muzzle end. Nothing in the grooves.
I'll patch some 270s and see what depth I can seat them and still keep them from working out of the case from recoil. I love this.....
