375 winchster reloading 240 grain lead

Anyone reloading cast bullets in their 375 Winchester ?

I put a few pure lead through my G2 Contender 375 Win a month ago and it was hopeless.
Pure lead was being pushed hard. Very poor accuracy and heaps of lead in the bore.

Now I'm all set to feed it some decent lino type projectiles.
They have cast nicely and are 240 grains.
I will probably go with Win 748 and magnum primers.
Drop well back from the max data I have and see how things go
Won't need to crimp because its for a single shot.
Will probably push them reasonably hard because its going to be an every day carry pussuming in the winter rifle, but don't expect to fire it very often.
Only when something tasty or carrying a decent head on it pops up

Does anyone have any solid experience with reloading the 375 Winchester ?
Probably for a 94 Big Bore