Reduce loads with Ammoload and IMT brass?

[918v]

FC brass is not looser to begin with.

But primers do vary in diameter. WSP seems loose in a FC case. That does not mean the FC case is loose or that it loosens easily.

I find that brass and primers like one another, meaning FC likes FC and Win likes WSP. Mixing and matching often results in ignorant comments. Using mixed brass further reinforces my point.

I have approximately 100K 9mm cases. U name it, I have it. I have different generations of stuff. I have the whole evolution of the FC 9mm case. I have the original, the FCdot, the dotFCdot, and the post-dotFCdot non-dot. I can even talk about the different casehead diameters over the years.

You're wrong.

 

[higgite]

Gentlemen, enough of the p*ssing contest, please. Back to my original topic, curiosity got the best of me and I had some spare time to waste , so I spent it measuring and weighing some 9mm brass. I used 20 count samples of resized brass with spent primers still intact. I won't bore you with all the numbers, but here are average capacities for FC and Ammoload brass.

FC brass: 13.9 gr H2O
Ammoload brass: 12.8 gr H2O

I ran my current favorite load for range plinking through Quickload and got some interesting results. I don't have a copy of the standard CYA disclaimer handy so I'm not going to post my recipe other than to say it includes FC brass, W231, Hornady HAP and CCI #500. Running it through Quickload yields a calculated peak chamber pressure of 28,800 psi. If I substitute the Ammoload average case capacity with the same recipe, the peak chamber pressure jumps up to 34,950 psi, a 21% increase and much a higher average than I'm comfortable with.

I could decrease the charge with Ammoload brass to get the pressure back down to FC level, but at the expense of muzzle velocity. Or, I could match the FC pressure and MV by seating the bullet farther out, but it would be too long to chamber in my CZ.

I know Quickload isn't exact, especially with straight walled cartridges, and I have no intention of taking its output numbers as gospel and running with them. But it does confirm that any brass with an internal step built in is brass that I don't want to bother with unless I get desperate. Thankfully, I don't have enough of it to lose sleep over. It looks right at home in my recycle bin. ymmv

Thanks to all who responded to my OP.

 

[Mad Chemist]

You are obviously more concerned with winning an argument than contributing to the thread.

Go play with your brass. I will continue load and shoot and I will not bother majoring in the minor ****e. Regardless, my groups with a tiny CCW pistol will continue to be smaller than the all the other weekend warriors with 5'' slabsides at the range. And they will stay that way because I spend much more of my free time actually shooting rather than talking about it.

And I will continue to load my mixed headstamp range brass along with the ammoload stuff. And the slight variation in components will continue to not make any discernible difference on the targets at 50'.

 

[Mad Chemist]

Higgite,

Your QL data is still below mean avg P for std 9x19 and well below MAP for 9x19+P.
http://www.saami.org/specifications_and_information/VelocityPressureData.pdf

But if you're not comfortable with it you shouldn't do it.

I still stand by my contention that the brass is safe to use with reasonable loadings.

 

[higgite]

Never said Ammoload brass isn't safe. Just passing along information about the magnitude of the jump in peak pressure with the same recipe in the smaller capacity Ammoload case. Of the 10 different headstamps of 9mm brass that I have personally measured, Ammoload is the only one with an average resized capacity of less than 13 gr of water. Just passing on my observations to anyone interested. As always, one should start with a low charge and work their way up with Ammoload brass, just like with any other brass.

 

[918v]

You are obviously more concerned with winning an argument than contributing to the thread.

How amusing it is when people's true colors come out when confronted with facts.

 

[918v]

As always, one should start with a low charge and work their way up with Ammoload brass, just like with any other brass.

I think you're doing the right thing.

You'd be amazed how case capacity and OAL affects a load when you fire each and every shot through a chronograph.