Questions RE: loading 9mm minor w/ .380 bullets


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The Wiry Irishman
January 14, 2013, 03:07 PM
CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.

I'm building up compensated gun for steel challenge and am getting to the point in the project where I need to think about loading. I don't need to meet any power factor for this, but I would like to have the option of doing USPSA/IPSC Open, so I'm going to shoot for minor power factor (125,000 bullet weight times velocity) Its pretty common for the USPSA/IPSC Open guys to make minor loads just by dropping a 95gr. .380 hollowpoint on their regular 9mm major load, typically somewhere between 6 and 7 grains of Winchester Auto-Comp. (I've seen a few guys running compressed charges over 7 grains, too) With that tiny little bullet and all that high pressure gas to run the comp, I've decided this is the way I want to go.

Reminder, 9mm major is way, WAY over SAAMI spec, and the 95gr load I am talking about likely is as well. Be VERY cautious working with loads like these.

What I can't find, however, is good data on OAL using .380 bullets in 9mm. This is where I would like some insight. Has anyone done any loads like this before? What OAL did you use? Are you seating with a minimum of bullet inside the case to get closer to regular 9mm OAL and allow more case volume for powder, seating to the same depth you would in a regular .380, or playing around with OAL until you find the one that feeds best in your gun? Does anyone happen to have a copy of QuickLoad they could run a few of these scenarios on? If not, I've got a feeling that considering the pressures involved here, I should probably invest in a copy before starting the physical process.

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jwrowland77
January 14, 2013, 03:17 PM
I believe the Speer and Lyman manuals have sub 115gr bullets under the 9mm section. I want to say that the Sierra manual does as well. I would start with the Speer and Lyman manual first though.

I your using Auto Comp, the imrpowder.com site might have the info your looking for as well.

Sorry I couldn't be anymore help. I'm at work and don't have them memorized yet. :D

The Wiry Irishman
January 14, 2013, 03:25 PM
Hmmm... I'll have to recheck my Lyman manual when I get home. I could swear there wasn't any 95gr. 9mm data in there.

jwrowland77
January 14, 2013, 03:31 PM
It may be my Speer or Sierra, but could have sworn there was some in the Lyman. Of course I could be mistaken to since I've been loading for my .380 here lately. :)

GT1
January 14, 2013, 03:35 PM
The Lee book lists a few loads for 90 and 95 gr bullets.

The Wiry Irishman
January 14, 2013, 04:04 PM
Well, silly me, when starting this project, I never thought to just go to powder manufacturer's site to see if they had had data. "This is far too weird a combination of powder and bullet," I said. "Manufacturer data is usually pretty limited comapred to manuals," I said.

http://data.hodgdon.com/main_menu.asp (http://data.hodgdon.com/main_menu.asp)

Everything I need is available online, don't even need to order the physical manual. I now have OAL, and a good starting load. Also it appears the load I'm going to be working up to is only over published maximums by a few tenths.

gamestalker
January 14, 2013, 09:12 PM
I load 90 gr. XTP HP's in 9mm all the time and there is actually data that Hornady has for these in 9mm. I use a stout charge of HS6 or Longshot for these and it works great. Nosler and Sierra also have 90 gr and 95 gr. data for 9mm as well.

I don't know if this helps or not?

GS

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