123 Nosler CC/Sierra HPBT/Scenars, 120 Scenar L
31.5-31.7 CFE, CCI 41/RP 7 1/2
2.26-2.285, depending on distance to lands and variable magazine length and feeding reliability.
2525 in 18” Lilja or JP, 2550-2575 in 20” Bartlein, 2650-2675 in 24” Satern.
All quite accurate and generally low ES/SD, depending on brass and brass prep. Very forgiving to load for.
Great numbers, but would agree that load is about .3gr above what is generally considered max over on Grendel forum. Betting brass and primer pockets don’’t hold for long either. Of course, everyone’s barrel and chamber are different. To those unfamiliar with Grendel, certainly wouldn’’t recommend that as a starting load, and suggest slow work up from 28.0, paying attention to distance to lands along the way.
18" JP light contour rifle gas= 2440 SD-5 ES-17
20" Precision Rifles (bartlien barrel) rifle gas = 2460ish and the SD/ES were good but I'm unable to find my notes right now.
No case head deformation. Primers are slightly flattened, still rounded on the edges. I've seen a handful or so of loads at the same charge as mine give or take a bit, posted on various forums. So I didn't think anything of it. I have no idea what max "book" pressure is. I start low and work up till I find a good accurate load that the rifle likes.
Not worried about brass life. My buddy shoots this round in factory Hornady and gives me his brass. I already have about 800 pieces between what I bought and what he gives me. Plus I'm just not seeing any signs that these rounds are over-pressured. Every rifle is different.
I haven't had any issues with it. I haven't tried running it with my can though.
While i suspect not many will play with 100 grain Amax, I have a box and decided to burn some imr8208 today in my 18" JP barrel.
POI and velocity, there definitely appears to be a node at 30.0 grains and possibly a step or two above where I stopped at, 30.8
If you can't see the velocity readings they are as follows:
30.0= 2712 SD-3 ES-7
30.2= 2733 5/10
30.4= 2742 9/19
30.6= 2775 14/26
30.8= 2782 15/28
If OCW theory holds, +3% of 30.0 = 30.9 so next time out I may try 31 grains, but given the numbers and group at 30.0... thats very tempting to remain there.
I am not sure how far the 100 A-max is from the lands, I just loaded them to what was printed in the hornady manual, 2.245-2.250. The 123 ELD is jumping about .030" and the Lapua Scenar 123 is jumping about .060".
20" Proof Research carbon fiber barrel
Hornady once fired brass
CCI #41 primer
123gr Lapua Scenar loaded to 2.260 COAL (1.721 off Hornady ogive gauge)
27.6gr AR COMP
2485-fps ES:10 SD: 4.5 over 10 shots
10 shot groups are around .6 consistently for me at 100 yards.