I have reloaded several thousand rounds using different components and powders. Not for the 270, but for a few other calibres. I am, at best, a pragmatist and a cheap one at that. Through all of this experimentation I have discovered that, for my purposes, none of this matters. I hunt. Period.
I have settled on ONE powder, and ONE primer this makes it easier to buy in bulk and still produce satisfactory results in all of my meager store of firearms. I use lots of range brass picked up when we have hunter sight-in days at the range (I know it is once fired, because it is still in the original 10yr old boxes). I no longer worry about lot numbers or specific water weights and volumes, but I do try to keep the headstamps separate, makes it easier to know which rifle it is loaded for.
The rifles themselves, in conjunction with the cartridge, must perform to specific standards and fairly rigid criteria to be selected as a hunting partner each time. Long shooters must group Sub-MOA from the bench. Those that don't fall into other categories, bush guns; open, short range (under 200yds) light carry; type of game, etc.
Don't worry quite so much about the strict rules of reloading and simply reload so that you can shoot. I do play with the case itself more now than I ever did and I believe that it has contributed to greater accuracy. Each case, no matter the headstamp, age, or source (even new) gets trimmed to length, primer pocket uniformed, flash hole de-burred, and FL re-sized twice (once, then turn 180 degrees) the first time I load them, that helps keep the cases even. When I change to subsequent loadings, they are neck sized using the same method. I do not turn the inside or the outside of the necks, do not check for acceptable runout, or any of the professional long-range shooter practices that can make cartridges so super accurate. Again, I hunt. I get the best performance I can out of fairly generic parts.
I hope you enjoy this hobby, it is as fascinating and time consuming as you want to make it.