Yes, but you can only push so much burning gas down that itsy-bitsy teeny little hole. Try to push more through that tiny hole and the metal in the throat starts to evaporate. Hence the 6.5 Creedmore rather than the 264 Win Mag.There have been numerous attempts to develop a really fast 6.5 over the years.
Yes. I had a 6.5-06 30 years ago. It would launch 140s at 3,000, 130s at 3,100. But it had as much recoil as a 270 Win ( Well Duh! Same bullet weight at the same velocity out of the same case!).Take a look at the 6.5-06. I had mine throated for 140 Sierras seated to base of neck. I get 2935 from 24" with a lot less powder.
Shooters today seem to be looking for a cartridge that defies the laws of physics: super fast, shoots as flat as a string, no recoil, never misses. And they want to split hairs: yes, cartridge X starts out faster and shoots flatter, but mine is still supersonic at a mile and passes cartridge X at 2 miles. Or even better: my BC is .641, yours is only .639.
I think the problem with the 6.5 Rem mag was the rifle they put it in. 660 mag was a laminate stock with a action that wouldn't allow bullet's longer than 120gr to be loaded out. I think the only commercial bullet's loaded for it were all 120gr. Kind of tied it's hands! The 600 was a short or standard action but the long action was just a bit to long! But the long action would have been much better, get those bullet's out of the powder space! That standard action usually find's the 6mm Rem also I think. The 6mm I had was not much as because of the magazine length I couldn't get bullet's out where I wanted them. If I was going to build something like that, there's a european company that make's five different action lengths and I'd bet one on them might work. Other wise an older Savage. The Savage was a longer action but to accomidate shorter cartridge's it had the magazine well and the action designed to work better. Then to it might need opened bit to allow you to seat out the bullet's.
I agree! The 600/660 rifle killed several cartridges, the 6.5 Rem Mag, the 350 Rem Mag, and the 6mm Rem. The rifle was too light for the 6.5 Rem Mag and the 350 Rem Mag, and the action was not quite long enough for the 6mm Rem. I remember the first time I fired a 350 Rem Mag, it was a WOW! experience! Didn't want to try again, that was for sure!I think the problem with the 6.5 Rem mag was the rifle they put it in.