I could not he the hornady hornet to chamber in my contender barrel. The hornady is a little bigger around at the case head area I believe. Just suggesting that you might check that before you buy a bunch of ammo.
I have formed a bunch of ai brass lately out of the ppu brass. It firms great with a little titegroup and a piece of paper.
Gunner were you trying to use loaded ammo or factory brass? Case head diameters should be the same for both PPU and Hornady. Shoulder Diameters may vary by .006" though with the 17HH being the larger offering.
If the PPU is working for you Great! Your OAL won't suffer any with the PPU and you should have a great false shoulder to help insure your fire forming brass stretches the brass in all the right places.
