What rifle? Note that Hornady's load data was developed with an M96
My T3X has a very long throat, and in my load development, I used a max pressure of 60k psi.
At 3.175" COAL and 44.5 gr IMR4831 (very close to S365), I'm getting about 2500 fps with ELD-X 143 gr
If you're kissing the lands, which I very much doubt with a COAL of 79 mm, 45 gr of somchem 365 shows just under 58k psi and MV of 2698 fps using Gordon's Reloading Tool. I'd expect that load to probably come in at about the same MV as my load using IMR 4831 given you likely have a very long jump.
I show a max load for S335 of 39 gr, MV 2620 fps and a little over 58K psi. Again, given the long jump, I'd expect a chrony to show that one at 2450 to maybe 2500 fps as well.
I wouldn't worry a lot about chasing velocity. Assuming a 200 yard zero, even if you could get your loads to 2650 or 2700 fps, it doesn't improve the ballistic arc or energy enough to be worth the effort, at least not for me.
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