Posted by Joe Duke on Dec 11, 2018; 1:19am
URL: http://oldforum.flyshooter.com.au/6mm-Grendel-Improved-6mm-ProCal-tp5709226p5710255.html

as I mentioned before, H4895 and Varget are probably the two most used powders.  But, the 4895 can behave a little erratically at times.
Two other powders I have tried are IMR 8208XBR and Alliant AR-Comp.  They will both shoot very well and I believe the edge goes to AR-Comp.  It seems to shoot a little better over a wide range of temperatures.  It does seem to burn a little dirty and leaves lots of black in the barrel.  However, it held up over the entire match for me. I do need to shoot a few more matches with it.
Is my IMR 8208XBR the same as the 8208 yall have mentioned?
Joe