Yup, you shouldn't absolutely need a magnum primer, but if you can't find any standard-strength ones, then ANY primer'll do.

270 win load
 

I have found that the 140 grain Hornady over RL-22 w/mag primer is absolutely devistating at any range on deer from Sask. to Tex., black bear and caribou too. I would love to try it on elk someday. I shoot a Winchester. FWIW

H4895
 

GoodOlBoy

I wouldn't give up on your idea to use H4895.Darn good powder in the 270.That and 4064 in the 270 will fall just a tad shy of the slower powders in the velocity department but both deliver top accuracy.2900+ is easy to attain.

H4895 is my go to powder in my hunter silohouette rifle.That's out to 500 meters and I buy it in the 8 pound jugs.

Don't sell it short. Give it a try. JMHO