First time out with my first 6GT barrel yesterday...
I was surprised by how much softer it shot than the already soft 6CM I've been running for the last ~2 years (at a slow-ish ~2900fps). The 6GT recoil impulse has a totally different character than the 6CM had for me with my rig, softer, but also kind of snappier/quicker. I didn't expect it to be so noticeable. Seemed almost like going from a .45ACP to a 9mm lol, I dig it I think.
After my usual barrel break-in ritual (3 dry patches lol), I shot 100rds over the course of the afternoon, and it sped up from ~2750ish to ~2880fps.
I've still got 200 more rounds in virgin brass loaded up that I will put through it before I do any load development, but the "generic load" I guessed on shot great, so looks like load development will be a piece of cake (or maybe not even really necessary).
Barrel: Proof SS Origin prefit 26" 7.5T SKU133484
Generic guess/first-firing/virgin brass load:
Alpha OCD Gay Tiger headstamp
CCI450
32gn Shooter's World Precision Rifle
112gn Barnes Match Burner
1.96" BTO 2.61" COAL
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Shot #100 at 1000 yards:
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I just load for speed at this point. No real load development since the first round of load development. I check SDs/EDs and that's about it.