I have 6.5 Grendel Ar-15 but with 16 inch barrel. I buy online Lapua brass. It seems to hold very well for few shots. About powder I use AA2520 or BLC-2. Bullets 120 BT, 120 TSX or 123 A-max. For hunting and overall shooting 120 BT are great. Speed 2350 fps, 16 inch tube.
Accuracy on good day...
With Sako 85 22.5 inch tube I shoot about 1.5 inch at 200 yards. I would like to get to 1 inch at this distance.
This was with 150 Partition bullet.
At 100 yards 3 shoots I could get in less than and inch.
When I shot 200 yards the day was cold about 17 F, when I shot 100 yards another day was...
If you need more speed RL-22 58 gr with Winchester Large Rifle primer produces about 2850 fps from 22.5 barrel.
150 Partition or Hornady Interbond. Max for me is 58.5 gr charge no pressure signs will add another 20 fps.
2850 fps with 150 grain bullet it is very nice energy set up for 270 win.
My load for 150 Partition is H4831 58 grain, Winchester Large Rifle Primer and 3.45 coal.
They fly 2800 from my 22.5 barrel and very accurate. Less the 1 inch from my Sako 85.
Great st up.
It works for 130 grain ab 54 grain and 3.345 col. cci 200 Br2 or Federal Large Rifle Match primers.
Out of 22.5 barrel it was 3030 FPS. I did not try this powder with 140's or 150's.
Be save and be careful before you shoot this load.