Cartridge is from Ammo Manufacture: Hornady Custom(#9126) 180 gr XTP (Redline 8/19)
Ballistics Information: 10mm Auto
Muzzle Velocity: 1275 fps
Muzzle Energy: 650 ft. lbs
Brass Make/Headstamp: HORNADY - Brass
Bullet Make/Weight/Construction/Info; Length 0. 6210"/Dia. 0.4000": 180gr Hornady XTP
Actual weight 180.0 / 180.2 / 180.0 grains  Crimp Diameter 0.3975" 
HP depth  HP 0.1625" / HP dia. 0.1975" (tapered) / mouth 0.2275"
C.O.A.L.: 1.2540" / 1.2505" / 1.2560"   (flat base) six segments
Primer: Large Pistol Brass color
Case: Diameter 0.4215" Crimp Diameter 0.4190" (tight crimp)Length 0.9880"
Powder Description/Positive ID/Type/Charge Weight: ? AA#7 ?  11.0 / 11.0 / 11.0 grains
Cartridge weight: 267.4 / 266.0 / 268.2
Real consistent...
Lot #3190821

In a bone stock G20 GEN3, using a 180XTP, with #7 powder, I needed 12 grains to average 1231 fps, and 12.5 grains to average 1283 fps.

This Hornady factory load in my 5.25" barrel XDM averaged 1299 fps.

All that said, for the powder to be #7, I believe it would have to be at least a 12 grain powder charge. So I don't think the powder is #7.

I understand that, It is why I left question marks?.  My older #7 is different than the newer formulations.  Its had to say it could be a special blend slightly faster than AA#7

Quote from: The_Shadow on August 14 2019 04:17:12 PM MDT
I understand that, It is why I left question marks?.

Yup, saw that. Was just throwing some thoughts out.

Maybe it's Shooters World Major Pistol (Lovex D037.1)?

In my G20-SF 11.6grs of AA #7 yields roughly 1170 fps with Hornady 180gr bullets.  12.0grs produces roughly 1200 fps, but I get smileys every time.  11.6 is as far as I can take AA #7, where case expansion is at its max allowable. So I don't believe this could be 'canister grade' AA #7 either, at least delivering the advertised 1275 fps. 
Some actual field chronograph data would shed some light on this..

Good job on the latest breakdowns!

It's not the LOVEX DO37.01 and I had tested it based on UW's use of 13.0 grains to match that load.  I'll keep studying this one with hopes of finding what's being used.