9mm major


Jason Mack
August 4, 2007, 08:44 AM
hi has any one used 9mm major or hurd of it ?

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August 4, 2007, 08:50 AM
9mm major is not a caliber.
It's 9mm, loaded to major power factor.
Loaded with HS-6, loaded LONG, and in stout guns.
Not for the new reloader.
The power floor for major power factor has been dropping for some time, in an effort to stop people from blowing themselves up.
I think it's 160 now, IIRC it was 185 at one point.
I may be way off on this, I haven't done run N gun games for a long time.

Jason Mack
August 4, 2007, 08:53 AM
have you tried 9mm major is it ok to use in practical shooting in the US yet i know they didnt like it some years back it was inventer by a british gunsmith Garry Clark

August 4, 2007, 09:00 AM
AFAIK you need a gun that's made for it, really tight barrel, new brass, tight lockup, etc.
It's cheaper to use a stock glock in another caliber than a tweaked out 9mm 1911.....

Jason Mack
August 4, 2007, 09:04 AM
Mr Clark was the man to see about a 9mm major gun he tried to sell the idea to the US shooters but the round wasnt liked

August 4, 2007, 09:08 AM
Well, I don't know a lot about it, but I would assume they had the major power floor to PREVENT 9mm from becoming a major caliber.
Plus, there were all sorts of other calibers, like 9x21, 9x25, 10mm, and the .40 and glock pistol came out in timeframe that was most unfortunate for Mr. Clark.
Didn't they actually introduce a bore size limitation as well??

Jason Mack
August 4, 2007, 09:12 AM
isnt 38super just a hot 9mm?

August 4, 2007, 09:14 AM
No, different case, and looonger.

August 4, 2007, 11:24 AM
PF is 165 and loading 9mm Major is extremely specific. The pistol used must allow very long OACLs. Powder selection has a very narrow window. HS-6 is probably the most used powder. V-V 3N37 is another, Vectan SP-2 when it was available. Ramshot Silhouette and True Blue are also used.

Years ago when power factor was 175, 9mm Major was allowed in IPSC for a time. Many shooters did not understand the load dynamics. Inappropriate fast burning powders and short OACLs found their way into competition. Ruptured cases were the result.

9mm Major is an Open Class competition load and shouldn't be considered for any other use. Recoil is more than brisk and there isn't any real application outside of competition where a larger/more powerful cartridge wouldn't serve you better. Looking at the data though, can be enlighteneing on what powders are most appropriate for +P 9mm loads. The topic is covered at Brian Enos' Forum.;)

August 4, 2007, 11:42 AM

August 4, 2007, 11:32 PM
Different Clark here.

I see that the Vihtavuori load book lists a major load with the 9x19mm, 3N37, and 147 gr.

There is no published load for Power Pistol that makes major, but I happen to know that Power Pistol can make 9mm major much easier than 3N37.

I have made major in a 100 year old .380 with Power Pistol [1.090" is a little long for a .380].

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