5.7x28......

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bluerev

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I have just acquired a Ruger 57. I hope to start reloading in a few days. I have heard this cartridge can be finicky to reload. The load data that I have found is far from consistent. Some data uses small rifle mag primers, some std small rifle, and some use small pistol magnum.....I find that odd. Why would you need a magnum primer to set off 5 - 6g of powder?...... This is just one of the issues I have found.... Any info from you guys would be appreciated.

Cheers.
 
Just sold my PS90 and came across a bunch of once fired casings. If you're interested, send me a PM. I never reloaded for it but kept them in case I ever did. I did hear there were "issues" with reloading it though.
 
mbogo3 said:
Mag primers were likely in conjunction with ball powder H-110/Win 296
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Some powders just work better with a hotter primer. In such a small capacity case substitution of primers might make quite a bit of difference in pressure.

I've also got about 40 cases if you are near Okotoks and would like them. Not something I ever expect to use.
 
vagrantviking said:
Some powders just work better with a hotter primer. In such a small capacity case substitution of primers might make quite a bit of difference in pressure.

I've also got about 40 cases if you are near Okotoks and would like them. Not something I ever expect to use.
Click to expand...

Pressure is my biggest concern. I think I will start with the recipes that call for std rifle primers first.
 
Well, I have fired my Ruger 57. Kinda noisy, but nice to shoot other than an atrocious trigger. I hope the aftermarket can come to my rescue....
Anyways, after shooting, I measured the empty Brass. This gun must have a huge amount of Headspace. The shoulder got pushed forward approx 0.040". For me, that is a tremendous amount, especially for such a small case. This may take "fire forming' to a whole new level. I will start the reloading process and chime back in later.
Cheers.
 
There was something I read about a coating on the brass that you are supposed to protect by not SS tumbling, or something like that. Be sure to read up on that as it sounded kind of important?
 
Paul_1982 said:
There was something I read about a coating on the brass that you are supposed to protect by not SS tumbling, or something like that. Be sure to read up on that as it sounded kind of important?
Click to expand...

I heard that too. I was shooting Americam Eagle ammo. According to what I have heard, they are not coated.... But lots are.
 
G_Alan said:
Was that too help feeding with the PS90 mags?
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The only thing I could find was a reference to the coating delaying the blowback action for a micro second to allow for pressures to drop before the action opened. How much truth there is in that, I have no idea.
 
I looked into a 5.7x28. Seemed like a fun little gun. Then I started to look into reloading it and found some interesting articles. Most were saying how finicky it is. Brass issues with the coating mentioned.

Since reloading for me is just about as much fun as the shooting I changed my mind and stuck to the 45 instead.

Good reads:

https://www.shootingillustrated.com/articles/2020/7/6/tip-handloading-the-57x28-mm-cartridge/

http://www.dayattherange.com/?page_id=3297
 
Ok...... So I shot my first reloaded 5.7 today. The sun was just going down so it wasn't full sun. The factory ammo has a decent amount of flash.
Well, my reloads are Blue Dot powder. 5.8 grains to 6.4 grains. I loaded 6.0 grains. My manual calls for magnum rifle primers. I used Std primers.....
Tremendous Fireball! Very bright and the size of a Volleyball!

The 4 rounds I fired showed interesting results. The firing pin strikes didnt seem terribly deep, but cratered. One of them have a hole blown thru the firing pin mark. I have only ever seen photos of that. I have been reloading for 35 and I have never seen that before. Could the std primer cups be softer than the magnum cups? I used the std ones to be conservative on this first loading.

Thoughts?
 
bluerev said:
I used CCI. Not at max load but showing pressure signs..... This is an interesting cartridge...
Click to expand...

When I was looking to load my own I was put off by all the issues others apparently had including blowing up their guns while working with published data. Pierced primer in this case is bad news since your firearm is likely not the cause.
 
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