So was that 50 between chronys or the 'known' speed Mac?
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That is exactly my load and it was precise 3050 from my 22” barrel and 3120 from the 24”, same speed shooting 72.6gr out of a Browning Hells Canyon 26”... @Boaraxa own the Hells Canyon, you can ask him, crhonographed with my magnetospeed with pressure sign been not a word in the process, just the accuracy node.
Good load it is to , accurate & fast mac tried a bunch of different loads but the one above is best in the browning .
The chronograph will be out I had exactly the same problem with it, I used Applied ballistics (with a custom curve) to do a Ballistic Calibration and the speed given from the Chrony was 105fps too slow.
Sorry I forgot to mention that when I dropped it off.