For me the standard weight for the 300H&H Flanged has always been the 220 grainer.
I have a single shot and I use it as a stalking rifle. I can tell you, the Woodleigh Weldcore is a hammer on hogs...
All of my loadings from my 26 inch tube slightly excess the speed of the 220 grainer in 30-06. I am not a reloader so I get these ready from W. Romey.

CZ