My guns have always liked IMR 4350 and H414 with light bullets. There is a very accurate varmint load I got from Ed Matunas many years ago that has shot well in many .270's - 90 grain Sierra Hollowpoint with 55 gr. of IMR 4350 - have used it for lots of varmint hunting applications. It shoots to the same spot as the 140 grain big game hunting loads, so it gives you the opportunity to use one rifle for a little varmint hunting during the big game season. Recoil is as mild as a .243.