5.7 x 28mm brass coating

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Rule3 said:
As you are the resident expert, how many reloads do YOU get from a piece of brass??
What bullets do you use?
What Powder
Dies?? Do you have a case gauge??
FN pistol or a Ruger??

I considered loading for it some time ago but read how difficult it was and expensive, Now with ammo so high priced I may consider it .
Click to expand...

I found an ammo checker for the 5.7x28mm at https://sheridanengineering.com/ I got the slotted version which arrived today. Tried it on factory ammo and resized cases. Works great.
 
I added this to the other 5.7x28 thread also.

My Lee dies wouldn’t push the shoulder back enough compared to factory FN ammo so I took 0.005” off the bottom of the sizing die.
I use a Hornady #5 (.260) comparator bushing as a headspace gauge.

These images are before and after modifying the sizing die.
Factory FN ammo was right at 0.9470” headspace when using my comparator.YMMV.
D7EAD46E-F8CA-42DF-B5BE-783F97EAFB45.jpeg AD067F04-F871-49BC-BDFD-32C6E11BE035.jpeg
 
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thump_rrr said:
I added this to the other 5.7x28 thread also.

My Lee dies wouldn’t push the shoulder back enough compared to factory FN ammo so I took 0.005” off the bottom of the sizing die.
I use a Hornady #5 (.260) comparator bushing as a headspace gauge.

These images are before and after modifying the sizing die.
Factory FN ammo was right at 0.970” headspace when using my comparator.YMMV.
View attachment 1059349 View attachment 1059350
Click to expand...

In my experience, the coating does not “grip the chamber”. The shoulder is going to blow forward, a lot, whether there is coating or not. This makes sizing and trimming essential for this cartridge. The Lee dies don’t set the shoulder back enough and may need to be ground. For these reasons the chamber gauge is not helpful either. You need to adjust the die to size the brass to fit your barrel. And trim!
The 5.7x28 is a tricky cartridge to load because neither FN nor Ruger got the blowback timing exactly right.
 
twarr1 said:
In my experience, the coating does not “grip the chamber”. The shoulder is going to blow forward, a lot, whether there is coating or not. This makes sizing and trimming essential for this cartridge. The Lee dies don’t set the shoulder back enough and may need to be ground. For these reasons the chamber gauge is not helpful either. You need to adjust the die to size the brass to fit your barrel. And trim!
The 5.7x28 is a tricky cartridge to load because neither FN nor Ruger got the blowback timing exactly right.
Click to expand...
got the Ruger, got the trimer, got the RCBS small base, and use the barrel as a gauge…

WIN WIN 4 Me. it’s really not that hard. But don’t think your gonna be cranking them out by the hundreds. this little bugger demands respect and gives back .22mag results. Very boring ballistics.
 
mstreddy said:
Mark, can you post a pic of that P90? I take it it's a dealer sample? Or do you have it through an agency?
So, taking the coating off isn't affecting the feeding out your P90/PS90 mags?
Click to expand...
My P90 is imaginary so yes, removing the coating doesn’t effect it
 
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mstreddy said:
I have both the FN 5-7 and the PS90. So far, I've only loaded a few and tried them in the pistol.
I'll have to get some loaded and try in the carbine.
Click to expand...
I was touristing the White house during the Obama days, the guys at the doors had P90, was cool to chat with them
 
mstreddy said:
I have both the FN 5-7 and the PS90. So far, I've only loaded a few and tried them in the pistol.
I'll have to get some loaded and try in the carbine.
Click to expand...
I also have both the Five-seveN and the PS90.
I’ve fired close to 500 through the PS90 and at least 300 through the pistol.
 
thump_rrr said:
I also have both the Five-seveN and the PS90.
I’ve fired close to 500 through the PS90 and at least 300 through the pistol.
Click to expand...
Thump,
Was that factory ammo or reloads? I have a very low round count through both, factory round probably 150-200 through the PS90 and around 50 through the pistol. I reloaded around 40 rounds and tested them in my FN pistol and my buddy's. They were a little light. And I need to work it up a little more.

Rule3 said:
I let that original post slide as I figured it was BS.
Click to expand...
Rule,
Yeah, it's hard to get good info sometimes.

For those with experience in loading for a PS90:
What I'm trying to figure out is how the coating loss will affect, or not, the feeding, chambering, extracting, etc, out of the PS90. Walkalong's experience with the AR57, is helpful. Trent's treatise on his journey reloading for it was a great read. But, then you have the various posts on why the coating exists and that it needs to remain in place.
In my very brief exercise with this cartridge, the coating was frequently damaged by the sizing die. Hence, my concerns.
 
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mstreddy said:
Thump,
Was that factory ammo or reloads? I have a very low round count through both, factory round probably 150-200 through the PS90 and around 50 through the pistol. I reloaded around 40 rounds and tested them in my FN pistol and my buddy's. They were a little light. And I need to work it up a little more.
Click to expand...
I put 200 factory through the PS90 and 100 factory through the Five-seveN.
The rest were reloads.
All were loaded with 40gr. Hornady V-Max, CCI Small rifle primers over Accurate No.7.
 
mstreddy said:
5 rounds only! Oh man, I'm sorry to hear that. Part of the allure of the PS90 is that wicked 50 round mag. If you make it down to SE Fla, look me up. We can plink with my carbine.
And load all 50 in it.
Click to expand...
can I come over too? I love vacationing in South Florida
 
Blue68f100 said:
Can the coating be reapplied?
Click to expand...
I don't believe it can be reliably reapplied. The folks at fivesevenforum have some info on it.

I don't worry about a little coating scraping off when sizing. I only reload once or twice so not a huge issue unless you are the shiny brass type of loader.
 
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