Re: 6.5x47
RL-15 was ambient temperature sensitive. Although exciting at first, RL-17 velocities varied across a broader range from morning to afternoon firings than did RL-15. I wish 17 had worked well, but it did not in my gun in NW Louisiana this Summer. One may consider using a different powder for every season, or every 10F change, or a morning load and an afternoon load, but that's dang sure more than I want to do though benchresters may find that way smart.
H4350 has been the SECOND most stable powder across various ambient temperatures among the favorite propellants I tried for this round - in my test experience, in this case: 6.5x47L with 120 and 130's. Note Matchking's VV test too.
HVarget has been THE most stable powder across various ambient temperatures, in my tests here, and at matches in Stephenville, Waco, and Kingsville, TX. Don't know about "no where else cause I ain't shot it no where else."
Your bullet choice will depend on your barrel twist. Ours are 8's. They shoot all the bullets well (120, 30, 40 grainers). Having about 2 grains less capacity than 260Rem., some believe 6.5x47 case capacity tends to favor 120-30 grain bullets. The gun will shoot these bullets well if its built right. Flip a coin among the top performing bullets and develop a load with it, or get ChadTRG to do that for you.
We don't know your atmospheric variables or altitude. CCI#41 primers are what I use. Rem 7 1/2 Benchrests, and WLR shot good too.
COAL will be around 2.7" but the bullet choice and chamber dimension will determine that measurement. Start at the lands and go back on the seating after finding your accurate powder charge starting at 36.0 Varget and going up to the node of around 2850 and another at 2950mvfps firing either a 120(123) or 130 bullet. To me, upon Rich Emmons' suggestion, the 130 is the more versatile tactical sport bullet due to its superior long range exterior ballistic performance and ogive geometry making it less finicky.
37.5 grains of Vargetor RL 15 with the 130 will shoot.
