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Go to 6mmBR website. There are loads listed there. Lists just over 30 grains with the 106CR bullet, so similar loads with 105-107 will do if worked up to carefully. Should make an excellent 6BR powder. I am sure going to try some in my own. Eagleye.
Do a search here in the reload forum or possibly the Precision Rifle forum.... Ice-Pick was doing some work with this powder in his 6BR with good results but I can't remember where his post was....he actually had the exact same thread title as yours.
Check www.6mmbr.com I am not sure if they have any load data on their site with the RL 15
My only advice is to watch pressures in warmer weather if you build a load in the winter. RL 15 is not as Temperature Stable as Varget so any load made up in the winter may have to backed off come spring/summer.