I picked up some sierra 85 gr hp's today and was wanting to load some up to try out, but I don't know how much powder I should start out with. I am wanting to use IMR3031. I have been shooting around 39 grains with some 100 grain nosler bt's. I was wondering if the same amount would be alright.
I have a Remington Classic in 6.5x55 and use IMR4064 48grs. with the Sierra 85gr. HP. It has a velocity of 3200fps and prints .4" (5 shots/100yds) Because of bullet length I only load it out to 2.895". You'd be hard pressed to beat IMR4064 in this caliber. Most rifles seem to do well with it. Best wishes.
The 6.5x57 which I load for is pretty close to a 6.5x55. I have excellent results with the combination 85 grains Sierra and H4227: 28 grains and Fed 210M gives some 2780 fps, hardly any recoil and sub MOA (5 shot) accuracy. Ideal for target shooting, killing foxes etc.