Good Price!!
I would go with a sizer that is .448 A friend of mine has that one and it is a little tighter than mine is. He says it is still pretty loose.
I have hunted with that bullet at .446 for a very long time. When I am carrying it I try no to carry it a lot muzzle down. I also don't ride with it in the truck or ATV muzzle down. When on the ATV I have a pack that I lay on the rack. Then I lay the gun on the pack and the muzzle is slightly up. Every once and a while I check it. I have never had the bullet off the powder. But I know it could so I watch for it.