Playing with 9mm major

[1slow]

I seem to remember an old article Colonel Cooper did where they were using cut down rifle brass, (.556 x 45 / .223 brass I think), to get a hot 9mm. Greater case web strength was the gain with rifle brass.
Cut down .308 was used in the early days of the .45 Win Mag as well for similar reasons.

[Tokarev]

I seem to remember an old article Colonel Cooper did where they were using cut down rifle brass, (.556 x 45 / .223 brass I think), to get a hot 9mm. Greater case web strength was the gain with rifle brass.
Cut down .308 was used in the early days of the .45 Win Mag as well for similar reasons.

Wasn't the 308 based 45 called the 45 Detonics? Maybe I'm getting some of these old Wildcats confused.

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[1slow]

.45 win Mag was a longer case, 230gr @ 1460. LAR Grizzlys shot these . Think 1911 on steroids.

[Tokarev]

.45 win Mag was a longer case, 230gr @ 1460. LAR Grizzlys shot these . Think 1911 on steroids.

451 Detonics Magnum

http://www.z3bigdaddy.com/site8/page44.html

[1986s4]

I seem to remember an old article Colonel Cooper did where they were using cut down rifle brass, (.556 x 45 / .223 brass I think), to get a hot 9mm. Greater case web strength was the gain with rifle brass.
Cut down .308 was used in the early days of the .45 Win Mag as well for similar reasons.

I recall an article in the American Rifleman regarding the 9 x 23 Winchester derived from cut down .223 brass for the case web strength you mention.

[MAXX]

I've done some pretty extensive testing and competition shooting with the new NAS3 steel cases. These are really great for added safety margin and also running heavy bullets. I've loaded 125s to 1600fps and the way up to 180gr @ 1150fps. The thing with 9mm major is having a good chamber, a comp to slow the slide speed down (or heavy 24lb recoil spring), and methodical handloading procedure. It's fun to play with, but you will eventually start breaking thing like locking blocks, lugs etc etc. Most of this madness has been directed toward bowling pin competition. I have had some very good success with heavy 9. Longshot and Autocomp rock for 9mm major.

[HCM]

I seem to remember an old article Colonel Cooper did where they were using cut down rifle brass, (.556 x 45 / .223 brass I think), to get a hot 9mm. Greater case web strength was the gain with rifle brass.
Cut down .308 was used in the early days of the .45 Win Mag as well for similar reasons.

9mm Super Cooper - it was cut long than standard 9mm though. I think it was an early 9x23 wildcat.

[JAD]

9mm Super Cooper - it was cut long than standard 9mm though. I think it was an early 9x23 wildcat.

It was .223 cut to super length and reamed. Juuuuust a little tedious.

[Hambo]

It was .223 cut to super length and reamed. Juuuuust a little tedious.

There are usually good reasons why some things don't catch on.

[bfoosh006]

https://atlantaarms.com/products/9mm...jhp-elite.html

BTW, Atlanta Arms sells a 147gr JHP "Major" load as well.

Out of my 16" Colt pattern carbine it chrono'd at 1348... and you could tell it was pushing considerably more pressure.

160fps faster then the next closed round, the 147gr HST +P