I want to Reload 5.7x28mm

[jhs27275]

We're hanging our hats on different hooks.

You stated the pistol can fire "more powerful rounds than the PS90", and looking at chronograph data, the opposite is true. The PS90 fires the same projectile at higher velocity than the P90 and FsN, without blowing primers or unlocking the magazine.

It boils down to the burn rate on the powder, primer choice, and finally bullet weight and style (geometric shape - more specifically, the bearing surface).

[ninthinning]

"I am also finding that a load developed for the SBR or PS90 can destroy your FiveseveN. If you base your load development solely on the FiveseveN then you are OK in the SBR or PS90. But if you develop a load in the SBR or PS90 and try it in the FiveseveN, you may get some pieces of a firearm spread out over the place even though the load was fine in the SBR or PS90. I have collected data that supports this theory of mine. Here is a pic of what I mean:"

Huh? I am saying rounds that are safe in the 5.7 can be dangerous in the PS90.

[jhs27275]

I am saying rounds that are safe in the 5.7 can be dangerous in the PS90.

You're allowed to have your opinion.

It seems you're a majority of one.

[SgtStrykerUSMC43]

"I am also finding that a load developed for the SBR or PS90 can destroy your FiveseveN. If you base your load development solely on the FiveseveN then you are OK in the SBR or PS90. But if you develop a load in the SBR or PS90 and try it in the FiveseveN, you may get some pieces of a firearm spread out over the place even though the load was fine in the SBR or PS90. I have collected data that supports this theory of mine. Here is a pic of what I mean:"

Huh? I am saying rounds that are safe in the 5.7 can be dangerous in the PS90.

Okay. I'll leave it at that.



PEACE THROUGH STRENGTH

[QB 45]

So, one theory here is that a FsN can handle certain loads, and P90's/PS90's can handle slightly hotter/higher pressure rounds... making me wonder if the AR57 would be able to handle even hotter loads. I'm actually betting not; I haven't compared them side-by-side, but if I remember correctly, the PS90 has a heavier bolt..... hm, maybe I'll look and see tonight!

I'm very interested in reloading this caliber... my troubles seem to parallel most others here, determining powder weight and charge. EA seems to be the best place to get proper bullets (I might be wrong), and I'd like to be able to find a very clean-burning powder for my rifles.

[mrchew]

okay, we all know the internet is full of experts, so i'll throw in my two cents

There is some great info in this thread, i'm amazed at the amount of time some of you have devoted to this round (and really grateful that you're sharing your experience).

I can't see the graph anymore, but it would make sense that the pistol velocities would flatten out sooner than the rifle because of the shorter barrel. any extra pressure beyond a certain point is wasted when the bullet exits the barrel. thinking out loud here, but it would be interesting to see if a *slightly* slower burning powder would perform better in the rifle. each rifle variant will probably have it's own favorite too.

As far as the controversy with the pistol taking hotter rounds, I doubt that either gun was designed for anything spicy! I have absolutely no data or experience to back this up, but my reasoning is this: P90 has large heavy slide with straight blowback operation, Pistol is using a delayed opening mechanism. Each design has it's strengths, simplicity with the blowback and weight conservation for the pistol. BUT when we get right down to it each one was designed for the same ammunition, and i would anticipate both being sensitive to pressures above that design. each one will react differently, as the pictures of scrap metal show!

one of the advantages (and dangers!) of the blowback design is that anything overpressure is just going to make the bolt open early, possibly venting gas and shrapnel in your face!

I just bought an AR57, looking forward to working up some loads for it! Thanks for the helpful hints on where to start! :P

[SONYtec]

okay, we all know the internet is full of experts, so i'll throw in my two cents

There is some great info in this thread, i'm amazed at the amount of time some of you have devoted to this round (and really grateful that you're sharing your experience).

one of the advantages (and dangers!) of the blowback design is that anything overpressure is just going to make the bolt open early, possibly venting gas and shrapnel in your face!

I just bought an AR57, looking forward to working up some loads for it! Thanks for the helpful hints on where to start! :P

I'll see your .02, and raise you .02.

The AR57 is blowback also, watch out!

[QB 45]

On a partially related note, it seems the slower action of the two rifles allows for less shoulder movement in the cases. My PS90 and AR57 don't allow the shoulder to move up too much, whereas the brass I collect from a FsN shooter at my range has higher shoulders and cratered primers. I've had lots of trouble getting these cratered-primer cases to fit in my Lee shellholder...

[KingLamoni]

This has been some very interesting reading. I've never reloaded before and so I'm planning on sitting with a local reloader with 42 years experience and I'm letting him guide me thru the process in a one on one setting and this data will come in handy when he and I sit down together. He has zero experience reloading the 5.7.

The purpose I have in learning is to save money on what I throw down line at targets. I'm going to use the Hornaday V-Max 40gr boat tail as my bullet for that. From what I've read here the cci 400 seems to be the general primer to use and for powder, True Blue if the data on FN loads is reliable, which I have no reason to doubt. Since the primer was the only thing not verified in the data, I might try experimenting with primers. But I'm just looking to find a load to match what FN makes and be repeatable with duplicating it.

For Personal Defense I still like my Glock but maybe I'll try some of EA stock for the PS90.

KL