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9MM Major Load Data Questions


czebin

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1 hour ago, Sarge said:

Add to that, most Open guns feel better at 172+

 

Ya know, that was true of my last three Open guns.  This one is different.  A 115 under 10.2gr SWMP for 169 PF is the perfect match for the 3-chamber, 2 3/16" poppel comp with a 10 lb. recoil spring, 19 lb. mainspring and a Cheely Open FPS.  172 definitely feels harsher.  If I was shooting 124s I'd definitely go to 172 or higher, just because I want the extra gas.

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i shoot whole last year with VV 3n38 8,5g and 123g FMJ.PF on CM was 171-173,it was very flat shooting.much better is with 115g and same 8,5g of powder,but it is forrbiden in IPSC Open(min 120g bullet)

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  • 2 years later...
On 1/1/2021 at 9:40 AM, grujo said:

i shoot whole last year with VV 3n38 8,5g and 123g FMJ.PF on CM was 171-173,it was very flat shooting.much better is with 115g and same 8,5g of powder,but it is forrbiden in IPSC Open(min 120g bullet)

I am having problems with bullet profile fitting the CM barrels.  What type of bullet are you using for this load and do you mean that the bullet wait is max 120g or min?  I am loading the CMJ 124gr Montana gold bullets but will need to find a different bullet for the CM or get the barrels reamed to fit this bullet profile. 

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4 hours ago, Banacek said:

I am loading the CMJ 124gr Montana gold bullets but will need to find a different bullet for the CM or get the barrels reamed to fit this bullet profile. 

Why don't you seat the bullet a little deeper?  My 9mm CZs require OAL to be in the 1.08 to 1.09 range for most bullet profiles.

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24 minutes ago, muncie21 said:

Why don't you seat the bullet a little deeper?  My 9mm CZs require OAL to be in the 1.08 to 1.09 range for most bullet profiles.

He's likely talking about major, in which a bullet that short would probably lead to boom when you're expecting bang.

 

In my experience, the Precision Delta FMJs have worked well for my Czechmate. I'm able to load about 1.16~ for a good plunk and spin.

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Here's some examples of what I tried during load development for my CZ.  As always, work up loads yourself, don't just blindly use what some yo-yo on the internet says will work.

 

OAL Bullet Powder Charge PF
1.1 124 RMR #7 9.3 175.14
1.125 124 PD  #7 9.3 174.94
1.13 124 PD Lovex 9.5 175.31
1.09 124 RMR Lovex 9.5 174.94
1.11 124 PD #7 9.2 177.17
1.11 124 Bayou #7 9.2 177.07
1.12 124 Bayou Lovex 9.3 175.6
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On 12/24/2020 at 10:03 PM, Sarge said:

If I recall you’ll have to load kind of short if it’s a stock gun. Keep the 125’s and try Autocomp. It takes up very little space in 9mm

2nd for AutoComp. I'm using 5.2 gr with 147 brass monkey coated bullets out of a 4" barrel and getting 170PF (1.125" OAL). Plenty of room left in the case if you were lightening up the bullet and increasing the charge.

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On 3/24/2023 at 5:17 PM, Banacek said:

... do you mean that the bullet wait is max 120g or min?  ...

 

IPSC rules has this for Open:

"Minimum bullet weight: 120 grain for Major"

 

I seem to recall that it was justified with something about keeping chamber pressures in check.

Edited by perttime
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  • 2 weeks later...
On 3/26/2023 at 3:03 AM, perttime said:

 

IPSC rules has this for Open:

"Minimum bullet weight: 120 grain for Major"

 

I seem to recall that it was justified with something about keeping chamber pressures in check.

 

Years ago Angus said the cause was because he was destroying crappy steel all across Europe shooting light bullet loads (T1 was as good as it got and not all steel was even that).

 

Back in those days it was twitchy to make 175+ PF in a 38 Super with very light bullets so not many did (case ruptures weren't uncommon in unsupported barrels) but once 9x25s and 9x23s and the like came along the damage got a lot worse. 

 

USPSA settled on 112gr, IPSC on 120gr minimums probably because of the prevalence of 115 and 124 gr bullets in the respective places.  Not long after they also dropped Major PF down to where it is now.

 

 

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