MAJOR recipe for Czechmate

[jjdurso]

I'm surprised you could load that long in the CM, no rounds binding in the mag?

Thank you for the info.

[1SOW]

1.161" will run  and within SAAMI stds.

If those were 124 HBR-TP,  it likely could be loaded shorter if preferred.  The standard Berry's124RN is pushing the envelope a little at that speed.
Wish I had a gun to join in on the fun. (Gun and Fun DO rhyme.  )

[gianmarko]

no problem at all. according to push test we could load even longer, but of course we must stay within standards

1SOW, what do you mean about the Berry RN?

I'm surprised you could load that long in the CM, no rounds binding in the mag?

Thank you for the info.

[CeeZeeNiner]

A little off topic.

I was looking around on that BrianEnos website and found a post where some guy (philg80) said he got over 1500 fps with a 115 grain bullet in 9mm major. I am guessing that 9mm major uses a standard 9x19 Luger brass case.

here is his load:

9 Major
8.4 grs HS6 or 8.0 grs Ramshot Silhouette
115 gr MG HP
1.1 OAL
Win SP Primer
Both shot around 1500 FPS


I plugged this data into Quickloads and it showed a pressure of over 75,000 psi. That is more than twice the SAAMI specs.

Do people actually shoot 2x max pressure loads out of their CZ pistols?



post #12 here:  http://www.brianenos.com/forums/index.php?showtopic=114549

[jjdurso]

Do people actually shoot 2x max

Yes, but 1.1" OAL and 8.4 grains of HS6 sounds like a VERY compressed load...  There was a time when Major power factor for USPSA was 175 (weight of the bullet in grains divided by velocity in feet per second, divided by 1000) and people did some crazy stuff with 9Major, but today the 165PF is much safer.

Some people do build 9Major guns from standard service pistols like the CZ75 and the Glocks, but they tend to wear out faster than those designed to handle the Major PF of USPSA like the Tactical Sport and the Czechmate.  I'm making generalizations and yes, I have shot a 124 grain bullet at 1350 feet per second out of a $300 small frame Tanfoglio, but I would expect a cracked frame, barrel or slide within a few thousand rounds if I made a habit of it.

[1SOW]

no problem at all. according to push test we could load even longer, but of course we must stay within standards

1SOW, what do you mean about the Berry RN?

I'm surprised you could load that long in the CM, no rounds binding in the mag?

Thank you for the info.

Berry's sells a standard 124gr RN plated bullet, rated up to 1200 feet/second.  They also sell the 124gr Hollow Base Round nose -Thick Plated bullet (HBRN-TP) that is rated up to 1450 feet/second

[gianmarko]

im resuscitating this thread as i got delivery of a czechmate. tested it on saturday during a club competition.

i reloaded a few rounds using 6.8 grains of a locally produced powder that STI owners use a lot for major reloads.

tested the loads (6.8 grs behind LOS 124 grs copper plated RN bullets magtech primers and assorted cases) and clocked around 1380fps

however, with this loads the compensator works very little, if at all. the barrel flip is the same i get in my stock shadow. i honestly expected more from this expensive gun. a friend STI owner tested it and advised me to get rid of the CM ASAP...

any suggestions? perhaps i should use different powders, producing more gases?  i tested my friend STI, using 7.5 grains of the same powder and same bullet, and there was NO flip.

[painter]

Did you try the same loads that worked in the STI in your Czechmate?

[gianmarko]

yes, slighly decreased to account for the shorter OAL. load in the STI is around 7.5 grains, i loaded 6.9

Did you try the same loads that worked in the STI in your Czechmate?

[jameslovesjammie]

yes, slighly decreased to account for the shorter OAL. load in the STI is around 7.5 grains, i loaded 6.9

You just answered your question.  The STI guys are getting more gas volume, which in turn is making their comps more effective.  You can't run the same powder they do because you won't build the same gas volume for the pressure built. 

If you can find Hodgdon HS-6 or Ramshot Silhouette, you will be much better served.  Those two are noted powders in the U.S. for short loaded 9mm major loads. 

I'd also suggest switching to 115 grain bullets, as the shorter bullet will have more powder space, which leaves more room for powder.  More powder equals more gas.

[painter]

yes, slighly decreased to account for the shorter OAL. load in the STI is around 7.5 grains, i loaded 6.9

Did you try the same loads that worked in the STI in your Czechmate?

How much shorter is the load? You reduced the charge 8%.

James knows more than I about this, but since you're overseas and might not have access to those powders you might need to get a bit more creative with what's available.

[gianmarko]

oal was 28.8 mm

i first tested on a chrono and saw around 1380 fps, same value my STI friends sees using 7.5 on a 30 mm OAL

yes, slighly decreased to account for the shorter OAL. load in the STI is around 7.5 grains, i loaded 6.9

Did you try the same loads that worked in the STI in your Czechmate?

How much shorter is the load? You reduced the charge 8%.

James knows more than I about this, but since you're overseas and might not have access to those powders you might need to get a bit more creative with what's available.

[1SOW]

Different powder/load likely.  Comp. is the driver , not speed.

 A friend shoots 9mm major with different pistols, Brazos, STI and another.  He shoots 124grMG,  Zero and some other bullets.  For HIS comp and pistols,  Silhuoette generates enough gas to keep the red-dot steady when shooting.  I know some who use HS-6 and n350.

Check on benos and look for "cocobolo" (and some others) and 9 major loads.  The comp. issues and powders used are discussed often.
When I win the lottery, I WANT to shoot 9 major.  Old guys especially, like good red-dots.

[jameslovesjammie]

oal was 28.8 mm

i first tested on a chrono and saw around 1380 fps, same value my STI friends sees using 7.5 on a 30 mm OAL

You are seeing the same speed because they are generating the same pressure.  What they are NOT generating is the same gas volume.  What makes a comp work is the gas created from the burning cartridge hitting the baffles in the compensator and forcing the gun forward (and downward, typically).  6.9 grains of powder does not generate as much gas as 7.5 grains do.  You need more gas.

[gianmarko]

i have been advised to use Vectan SP2, will source some and test it. will also test the N350, a colleague uses it.

thanks for all the suggestions. i am a total newbie in the field of major loads and compensators.

"Comp. is the driver , not speed."

im taking it easy PFwise, dont want to blow up a brand new, expensive gun....