Kenny Jarret says the 300 jarrett with 180 will do 3150-3250 and that is off his own website. Most reloading manuals will list 300 weatherby with 180 from 3050 to 3150 and we know that is probably on the low end.
Do your own research on Kenny Jarretts site and look up the weatherby or other cartidges. However, if it is strictly hunting gun, would be nice to be able to walk into a store and buy cartridges.
If you want fast, go to Tooley custom rifles
and look at his 30 HV, puts a 180 gr bullet at 3500 fps out of 26" barrel.
Speedy builds some good hunting and LR guns.