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115gr feel too snappy for me. The recoil is sharp and blatant. You may be happier with 124gr. But as far as loads go, 231 and 115gr do very well together.
231/hp38 is a good powder for that load. It's been mentioned, but I'll second it, go with the upper midrange of the load data. Lower than that, for me, stovepiped once, and burns a little dirtier. My most recent batch was 115 FMJ over 4.9gr. I think the loadbook max I was working with was 5.1, so that's getting up there, but it shoots great in my sigma.
Back in the late '80's thru the late '90's Precision Delta Cartridge of Ruleville, MS pretty much "owned" the market for factory ammo in NRA PPC competition. Many matches were won, and many National Records were shot with their 9mm ammo.
Their load was:
-Starline Brass (headstamped P-D) for Precision Delta
-Winchester Primers (Federal can be too soft for the 9mm pressures and give cratered/sheared primer metal in the firing pin hole. (ask me how I know!)
-Remington 115gr JHP from bulk packaging.
-5.0gr of Win.#231.
-Seated to 1.125"oal. (This is important to reduce pressure and improve accuracy and feeding reliability)
Nominal Velocity is/was 1,175fps from 4" bbl. My 5" S&W PPC-9 gives 1,200fps.
Accuracy is unbelievable. I was called full of "Green Garden fertilizer" by a former moderator of TFL. But have targets, trophies, guns won- to prove it........
Precision Delta for economic reasons has discontinued using the Remington bullet and Win#231 powder. Accuracy has suffered greatly too!
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