I think a 240 Weatherby would be an ideal open country deer and antelope round. I have used the 243 & 6 Rem. for as long as I have been hunting with no complaints. I just built a fast twist 6mm AI which is close to the Weatherby and it is shooting really well out to 500 with just the CDS rectacle.
Weatherby increased the twist to 9 or 9.25 so should be good for bullets up to 105 grains.
I thought they changed the twist as well but apparently after visiting their website it is still 1-10. Oh Well
My 10 twist .240 does very well with 100 NPT, won’t stabilize 105’s. In fact the 100 NPT is sub MOA over MRP.
I wish my .240 was 9 twist.
DF