Pretty sure he had a lot to do with promoting the 243/6mm bore size. I had a pre-64 featherweight 243 that was 'improved' to 240 PSP (Page Super Pooper). Essentially a 6 Rem improved or more likely a 6mm-257 at the time he made it. He had another 240 that was an improved 243...this was before the 243 winchester.
I remember reading about him going to NZ and killing a bunch of critters with the 240 PSP.
