As I mentioned previously... I had to redline the W244 data to get anywhere near advertised velocity; it was the slowest of the 4 powders I worked with. 4.5grn W244 (max load from Hodgdon data...) barely gave me 1000fps with the 124grn RMR PRN, out of my 3.9" Kahr. Everything else was 50+ fps faster. I found the same, generally, in the .45ACP as well.
If you used Hodgdons data and loaded to 1.150 I can see that. I can't get their velocities with their data either.
I load all my 9mm at 1.100" and adjust my loads to be where the velocity in the recipe says it should be. Their OAL is 1.150"
About 50% of my 9mm loads I have found, don't have to be adjusted to stay in the velocities posted by powder maker, with my shorter OAL. In fact the shorter OAL actually brings the velocities up to where the company claims it should be to start with, and I good with that.
I'm using a 4.5" Walther PDP SD Pro with polygonal riflings and stepped chamber. That may have something to do with why my loads are reading higher than yours. Don't know but maybe.
Oddly enough, Titegroup is one of my best behaving powders for my shorter OAL in 9mm. Maximum load with it was around 1120 avg with loading it to 4.1gr with 124gr plated bullet, at .040" shorter than Hodgdon's data says.
That's one reason I like it so much. Seems very stable and I've gone through about 12lbs of it and it's always been the same for me.
I think some our powders have a lot more variations, then we think they do. We may just blame the variations on something we did wrong like a little different OAL, not the same exact bullet, or the weather messing with the Chono or something.
I'm using a doplar unit from Garmin.
I have found in my last 50 years not to trust anyone's powder data to be what they say it supposed to be. I'll start low and work up as we are supposed to. It may be slow or maybe really fast, hardly ever right on.
I have some powder being tested right now that is giving me over maximum load data velocity at what is claimed to be the minimum charge load by the company that made it, with their OAL.
I haven't heard back from them yet, but it's only been a week. When I told them what velocity I was getting and what I used to get the velocity with, they wanted me to send some of it in for testing.
Haven't heard back yet but it's only been a week.
My data for Win 244 is as follows for 15 shot string with my OAL.
1146.6 * cold barrel
1119.7
1145.2
1134.9
1139.3
1130.5
1123.5
1123.1
1108.7
1105.8
1130.5
1101.3
1108.7
1148.8 * May have been someone next to me. Garmin will pick up shots in indoor range that aren't mine. I try to shoot when no one else is.
1128.3
I need to test these in my Shield with it's shorter barrel (3.1") to see what the velocity drop will be.