Originally Posted by
browningautorifle
So...with all that, a better choice for the sub cal chambering would be either .460 S&W or even .500 S&W to engage the rifling. They would still have lots of power and still be tame for that rifle. The problem however is wanting to shoot lead bullets and the OP doesn't want to reload his ammo...no factory lead loads are available that I'm aware of, although there are companies that do custom loading in the US aplenty... I would do it for him if I was even in the same country. Having a sub cal made and chambered would still be cheaper in the long run that laying out for dies, brass, bullet molds...or buying from someone that custom loads 577/450...
This gets more complex...