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Hmmm - Quickload says that at 61.5 of N560 with the other data you've provided that you'll be getting 3072 fps - at at predicted 69750 psi - as the velocity predicted is pretty close to actual I'd say the pressure is too . . . . when I first started reloading 65,000 was the limit of what primers and brass would take but they seem to have improved - however its not territory for the faint hearted! Case capacity of H2O would be interesting to see if it got QL a bit closer to actuals
Nosler reload website gives case capacity for 280ai at 65.0 H20 with 160 gn projectiles
got to run some groups with the AMAX & N560 combo in the 280ai. Top loads around 61.5 gn gave slightly sticky bolt lift on 2nd & 3rd rounds. First rounds with "cool" barrel were fine.
Dropping back 0.5 gn = no pressure signs, nice 0.7 moa group with a bit of cross wind to contend with & 2980 fps. That will do me nicely - you beautie !
Figured I might up date this, I've shifted a swarvo Z6i 2x12x50 on to this rifle, and been shooting it a bit, of late,
Have settled on a load, with 154gr SST, over 60 gr R26 in Lapua brass, Gold primer. this gives me 2900fps, Dissapointly the 154gr interbond, is two inches left and three inch low, @200m, with the same load. May readjust sights, to the interbond, as bought 3 boxes (300) for $40 each at the last gun show.
I am yet to try the 162gr, with lapua brass, or R26.
I gave up on the Remington brass, lots of case stretch, S&B brass, has lots of variance, in capacity, but rifle loves the 173gr S&B ammo.