Are you thinking of this chart? https://commons.wikimedia.org/wiki/F...ballistics.gifOriginally Posted by Nightvisionary
The 5.7x28mm is a flat shooting pistol cartridge, but the bullet drop from an iron-sighted handgun will likely be 2-3 times greater. Still pretty good, though.
Nope, all those are the PC super neutered eunich loads FN came out with when the PS90/5.7 was originally released to the public. It's what gave some the impression that the 5.7 is a centerfire 22 Magnum. I got these numbers directly from the article linked on page 8 of this thread. In that test they are using currently available S198LF which has a velocity similar to that of the original S190 FN 5.7 load.
https://www.realguns.com/articles/1159.htm
Here's the chart for factory blue tip SS197 40gr VMAX from the Five Seven / Ruger 57, zero'd at 25yd:
5.7 chart:
9mm NATO chart:
Thanks for the clarification - 27 grain bullet @ 2159 fps and a red dot sight.
The ballistic coefficient must be very low for that bullet to only have .22 Short energy at 200 yards.
G1 ballistic coefficient of .101 would equate to 24.5 inches of wind drift at 200 yards in 10 mph wind.
https://www.federalpremium.com/ballistics-calculator
Last edited by Velo Dog; 01-06-2020 at 11:16 PM.
The aerodynamic form factor of the SS198 projectile is actually pretty good; it's a 0.815" long OTM with a good shape and boat tail.
The reason retained energy is low at 200yd is that the projectile only weighs 27gr, as its an aluminum core. So at 1000fps, a 27gr projectile only has 60 ft/lbs of energy.
In general, I view the 27gr as attractive for close range (5-50yd) due to the high velocity effects.
But for the longer range, 40gr is more advantageous; SS197 at 200yd is 40gr @ 1175fps, equivalent to a .22lr CCI Mini Mag from a 10/22 at the muzzle. Not setting the world afire, but nothing to sneeze at either for a 200yd handgun, especially when the drop is factored in.
Not bad for a pistol round. Just being able to put holes in a target at that range with almost a point blank zero is impressive even if it doesn't have much energy left.
What kind of penetration does the 27gr bullet have?
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The case design is interesting. I do wonder if the issue of bimetalic corrosion was addressed as some stainless steels react poorly when in contact with aluminum. I assume it was as the bases are nickel-plated aluminum alloy while the body is a stainless steel. I am going to try some of the 9x19 cases in my Grand Power X-Calibur set up for USPSA Production.I agree, brass availability is ultimately the make or break factor for 5.7 succeeding. With an alternate source of brass, other companies can start loading 5.7 target ammo.
And companies like Underwood and Buffalo Bore can work on developing high performance offerings, similar to the loads currently offered by Elite / Vanguard/ R&R.
One company that could be a promising option for brass is Shell Shock, maker of these innovative hybrid aluminum / steel cases. The base is aluminum, while the body is a thin wall stainless steel:
A couple advantages:
-Shell shock cases are cheaper then brass
-They are rated for 65-70kpsi - ideal for the higher end 5.7 loads / increased safety margin
-The thin wall case offers slightly higher case capacity
The 27gr typically gets 9-10" penetration, while completing one large, nasty yaw cycle. Its essentially a micro 5.45x39.
Here it is in the tougher, 20% ballistic gel:
https://www.youtube.com/watch?v=vA6wf41ze9U
Due to its aluminum core, its very penetrative, capable of going through a surprisingly thick chunk of bulletproof glass:
https://youtu.be/_teY8vwwXvA?t=50
All in all its a mixed bag. Gel penetration is low, but is also displays the most rifle like velocity, tumbling, and barrier penetration.
It seems like from other tests, at 32gr and above is where we see 12" of penetration.
This is exciting!
I was always interested in the 5.7, but high price tag, reported crappy trigger, and high ammo cost has always made it nothing more than justification for a .22tcm.
If this thing sells (or Ruger was smart enough to effect it preemptively) more manufacturer’s may get involved and bring the ammo cost down. If that happens, game on.
What do you suppose they follow this up with an AR-57 or a PC Carbine sharing 57 mags?
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