I shot this barrel for the first time a few weeks ago. No cleaning or break in routine. Boresight, 100yd zero, then ragged hole group in typical AI fashion. after about 40 rounds the barrel sped up and settled in at 2480fps with 175gr FGMM factory ammo. I'll say it shoots pretty dang good for such a shorty. We built a dope chart out to 1k. The drops followed my charts out to 700, then it started to fall off needing 12.5 mils at 1k.
Also note this is not a Proof prefit, It was a 16.5" blank that I had chambered by Accurate Ordnance.