Re: .270 win help
Well, your rifle simply may not like Speer bullets, end of story. Some rifles are finicky. Mine do not shoot Hornady bullets well, no matter what kind of time I put into the loads.
I suggest, if you insist on working with the Speer bullets, you try Re19, IMR4831, IMR4350 as well and vary the seating depth. I'd find out what the max of each powder is first. Then load up 3 of each at your rifles max, then compare. Whichever one shoots best, go load more test rounds with varying seating depths.