Re: 270 win load ?
With 140's I use cci 250 and 60-61 grains of R-22. work up to it and it will probably get you the highest velocity without case damage.
Using a tall drop tube I can get @ 62 grains of long rod powder in a standard 270 win case. These are very compressed loads.
I did allot of chrono work and powders slower than 7828 or faster than r-22 could not attain the same high speeds in my rifles with the 140 & 150 SBT's
.270 Ackley improved 29 inch 1.250 dia. target barrel 7mm STW 28 inch 1.250 target barrel. I also love my .458 mag for varmints and the biggest game in the world.