Have 3-.300 magnums also. The H&H/Winchester/Weatherby.
Got four and love em, two Win Mags, an H&H and a RUM, they are stone killers for damn sure.
Had a RUM and decided that it was no better than the .300 Wby. This was just after the cartridge was introduced.
The RUM burns a bit more powder than the Wby, so it's gotta be mo better...
And, it could make more noise than the Wby, maybe kick more...?
That would make it, more likely than not, Gunner's favorite .300...
Just guessing, of course...
DF