Those are great velocities for a 22" 280 AI. I was able to get 2930 without pressure signs using 58.8 grains of RL-23 and 162 ELD-M's. With it being so hot right now, I'm still in the break in phase. I'll report my results soon. I may try some N565 too. I have noticed that the throat is very short.Range report 20220723
Temps: 85*
Wind: zero
Ten round ladder
Peterson Virgin brass, neck tension set with .283 mandrel, chamfered and de-burred
Powder charge: RL26 @ 61.2-63 grains in .2 increments.
Projectile: Berger 168 vld hunting
Primer: CCI BR2
COAL 3.330
CBTO 2.535
61.2 - 2947
61.4 - 2969
61.6 - 2989
61.8 - 3023
62 - 3012
62.2 - 3012
62.4 - 3020
62.6 - 3030
62.8 - 3037
63 - 3079 slight ejector mark
I was very impressed (shocked) at the velocities I was seeing today. Other than the 63gr load there seems to be no pressure signs. These charges are what I got speaking with Berger. Looks like at max I was ~120 fps faster which seems very high to me considering I'm also shooting a barrel 22" v. Their 24" test barrel.
I'm gonna play with that 61.9-62.3 range next
JDJ: are those loads compressed quite a bit? I was starting to crunch powder at about 58.2 grains of RL-23 and the 162 eld was just off of the lands…