In new doubles it is fine but I would never do it in an older one. A william Evans .470 that I have, the only bullets that I use are woodleighs and I don't even use federal factory ammo through it because my experience of chronographing and pulling heads on federals is that they are hotter than Ross Seyfrieds conversion to the origional cordite loads. Back to the TSX bullets, Butch okays them and he actually told me that Barnes had just come out with the TSX for .577. In fact, he gave me a box of .500 TSX's to try on buffalo two years ago and since then, I have never looked back. Their penetration and perfomance as of yet have been superb for me.

wadeb