Hi guys, just bought a 270 and I also have a 30-06 I am going to buy some powder soon and want to use the same powder for both cals.
Witch would be best Vit 140, Vit 150, or Vit 160. The 270 will be running 130 grain heads and the 30-06 150 grain.
Many thanks in advance, Tusker.
The trouble comes with the bullet weights you are shooting, the .270 suits heavy charges of slow burning powders and the light for calibre 30 cal bullet could do with something a bit faster to get the velocity.
Your choice seems to me to be optimise one calibre at the expense of some velocity loss in the other, use different bullet weights in the two cartridges to suit the powder picked or accept a small trade off on both and go for a compromise.
In the case of the latter, H4350 could do very well in the role you describe as a compromise, a compressed load with a 150 grain bullet gives me 3000fps give or take from a 22" barrel and I believe the .270 was loaded with various versions of 4350 for years before the 4831 burn rate became available. I have had good success. I have no experience with RL19 or N150 but understand that they are of a similar burn rate, reloading data is available on the respective manufacturers' websites and show similar results.
If you are prepared to explore different bullet weights the if you were to say dedicate the .30-06 to shooting 180 grain bullets, you could use H4831 or N160 successfully for both at optimum velocity. I had a great load of 60 grains of H4831 under a Hornady 180gr interlock for about 2650fps that I've hunted South Africa with. The classic .270 load is 62 grains of H4831, with top velocity, so this may be an approach worth considering. This shoots plenty flat, by the way.
The last option is to compromise one for the other, in that case you need to decide which you will be using more and then just forget about it. A difference of even a couple of hundred feet per second from factory spec won't make that much difference on UK deer and would have less recoil.
Personally, I would go for the second option.