I built the 450#2 myself on a Spanish action. There is a long thread regarding its construction in the Building DR forum in 2007.

I'm the hansome fellow in the photos, the ugly bearded one is my mate Jaco (S A Hunt)

Regardt Du Plessis is the young pin up boy on the right

Also a friend and both are damm good hunters.
The loads are 480 Grain Woodleigh softs and solids over 112.5 of H4831 (long cut) for 2160 fps.

She has acounted for 2 Wildebeest and 2 Warthog. The performance on the WB I would rate as excellent. Though they have a reputation for being tough and in the same trip 2 were lost to other hunters, neither of mine travelled further than their own length with heart/lung shots. It simpley knocked their legs out from under them.The expanded bullet photo was the only one recovered. WB was facing slightly quatering. It entered the chest at the front and was cut out of the rear hip area.
I rate it as a great caliber, never a sign of pressure and very accurate. The first WH was taken at 70-90 yards in fading light off sticks and the second at 90ish offhand,

What do you have ??

Regards