If you are going to buy a new rifle (for whitetail only) that .270 will work as good as any.I have had one almost my whole 29 year deer hunting experence.I now have a .270wsm and it is doing a good job to.If you are just wanting to hunt that .300 H&H will be ok to,I here it all the time about my .300wm it is to big ,it will blow them up.I just like that cartridge it works in all situations.