I've been meaning to get to this for some time now and finally had the chance today. Plenty of people have asked and now it's here. I will say there were no surprises and it performed very well as one would expect. The test gun was a Sig P229 with a 3.9 inch barrel. The short barrel test was with a S&W Shield with a 3 inch barrel. Fired at a distance of 10 feet into two 16 inch blocks of Clear Ballistics gel. Velocity was measured using a PACT infrared chronograph. Here is a link to my earlier test with the standard pressure 124gr HST.    

https://generalcartridge.wordpress.com/2017/06/12/federal-9mm-124gr-hst-in-clear-ballistics-gel/



The first round into the bare gel hit with a velocity of 1174fps  penetrated to 16 inches and expanded to .65 inches. round two had a speed of 1130fps expanded to .63 inches and went through 16.5 inches.



The first round into heavy clothing didn't register on the chrony but penetrated to 17.5 inches and expanded to .61 inches.  The second round had a velocity of 1154fps but hit so low in the gel that it hit the table the gel was sitting on so I'm not going to report the penetration or expansion.



Finally, the two rounds fired from the Shield. Round one, into the bare gel, hit at 1106fps penetrated to 15.5 inches and expanded to .61 inches. The second round had a velocity of 1099fps penetrated to 15 inches and expanded to .63 inches.

that is awesome especially from short barrel.

Great work OP, have you done any tests with Hornady XTP's?

Yes.
American Gunner 9MM 124gr +P XTP in Clear Ballistics gel.

Thanks for posting OP. Good work.

Great test OP, thank you!

I like the penetration and expansion out of the shorter barrel.

Thank you. Love the results.  It's what I'm carrying in my G43.

I decided to do a quick comparison of the 124gr HST +P and standard for velocity, penetration, and expansion. After looking at it I'm not sure if you really gain anything using the +P in this case.

With the 4-inch barrel,  you get an average velocity increase of 45fps.  Average penetration is the same at 16.5 inches and expansion is only .04 inch greater.

With the short barrel, the standard load actually penetrates deeper at 16.5 inches compared to the +P at 15.25 in bare gel. unfortunately, I only had one round of the +P from the clothing test but the comparison of the two show that there is not much difference. The standard had an average penetration of  17.5 inches. The same as the one +P round tested. The standard velocity also had an average expansion of .59 inches and the +P at .61 inches for a difference of .02 inches.

Good work, op.

Just for reference, I average 1069fps with the 124g standard pressure out of my 3.1" Shield and 1101fps out of my 3.3" XDS9.

Have yet to chrono the 124g +p.