300 BLK Powder Question

[Ed_Shot]

Just starting out with a new 300 BLK AR. I'm using the Lee 312-155-2R with both IMR 4227 and RL-7. Would like to try Alliant 300-MP. Done a lot of reading but data is scarce. My COAL with the 155 gr. is 2.00" sized .310. Would appreciate words of wisdom on a start and max charge of 300-MP with this 155 gr. boolit.

[popper]

Sierra shows loads for their 150GD, 17.2=1786,19=1960max. Should be very close.

[Gunnut 45/454]

Haven't used RL7 so no help there. My powder for this bullet is Lil Gun 15.5 gr under the Lee 155gr runs about 1875 fps. And gives 1-1.5" groups at 100 yards.

[arjacobson]

Haven't used RL7 so no help there. My powder for this bullet is Lil Gun 15.5 gr under the Lee 155gr runs about 1875 fps. And gives 1-1.5" groups at 100 yards.
Same here.. LIL gun has worked great for me..

[Stuckcase]

I cannot help as I am brainwashed by the 1680 bug