EA FsN Heavy Duty 20 pound Recoil Spring.

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bobapunk
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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by bobapunk » 23 Jun 2011, 03:24

Isn't a slight escalation in FPS somewhat normal as the chamber and barrel heat up?
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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by panzermk2 » 23 Jun 2011, 06:16

Not like that.
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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by spartacus » 07 Jul 2011, 05:10

I got my new recoil spring in a couple weeks ago and brought it for a test run last week... I'm sorry to say that I was very disappointed. I have never had a failure to feed in that gun even after thousands of rounds without cleaning it. I put the new spring on easy enough, gave the gun a good cleaning, and went out to the hills to shoot. I went through 60 rounds with the new recoil spring and had it jam 3 times. Any suggestions to fixing the problem? I was using some fairly light loads, 40 grain v-max with 6.8 grains of AA7, are the loads too light for the new spring?

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by panzermk2 » 07 Jul 2011, 06:06

Your loads are too light.

It is a Heavy Duty 20 pound spring instead of 18. What made you think it would work with light loads?

HD springs aren't for light target loads.

I can make light duty target springs just like there are for other guns but I do not think the demand is there.

You also should think about cleaning your gun more often.
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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Grantness » 07 Jul 2011, 08:21

Shot mine all weekend and it functioned flawlessly....even with blue box ss195.

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by spartacus » 07 Jul 2011, 08:26

Correct me if I'm wrong but that light load should be slightly hotter than factory loads, does this recoil spring not work with factory loads? I knew the spring wouldn't work with light loads but I assumed it would at least cycle with the standard factory loads. I typically shoot hotter loads anyway so it's not a huge deal, but it may be something that should be addressed on this little thread if that is the case. I'll be reloading some hotter rounds soon and see how it does.

It also seems like the new spring has a slightly larger outside diameter than the factory spring, the barrel now sits off center in the slide and there is a small gap in between the slide and frame, is this normal? I dont think it's anything more than a cosmetic issue but just making sure.

One more question: Shouldn't the heavier recoil spring increase the life of the brass? The spring should hold the slide in place longer causing less stretching of the neck... right? Just curious.

I typically dont go that many rounds without cleaning my gun, I did shoot a couple thousand without cleaning it one time and was quite impressed that even then the gun functions flawlessly.

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by spartacus » 07 Jul 2011, 08:33

Grantness, you mentioned that yours jammed the first few rounds with it, what did you do to fix it?

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Grantness » 07 Jul 2011, 08:46

I've chalked it up to the particular 30rnd magazine I was using. I've had problems with it before. That being said, only the first two or three rounds had problems. If it had something to do with the spring, it worked itself out in a hurry. I agree with Jay: clean up again, and try a stronger load. Western Powders lists 7.0gr of Acc#7 for their minimum load on a 40gr Sierra. Like I said, I had no problems all weekend with even the weakest of factory ammo. ...But I didn't buy the HD spring to see how it handles weak ammo. I intend to explore the other end of the spectrum and find out how much max loads may or may not increase.
Last edited by Grantness on 07 Jul 2011, 08:57, edited 1 time in total.

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by spartacus » 07 Jul 2011, 08:57

That's what I'm planning on doing, but will be slightly disappointed if I cant use target loads with it. On Accurate's website they list 6.8 as the max load, I do acknowledge that it is no where near a heavy load but it should still be hotter than a factory one (should be going just over 1800fps according to data).

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Grantness » 07 Jul 2011, 09:02

I dont see where you're getting this. Im looking at their load tables right now. They list 6.5gr for the Max load for 40gr using Acc #5. For Acc#7 they list 7.7gr as the max load....7.0gr is the MIN. I happen to know that you can go even higher than 7.7gr. I've also found out that the velocity figures they put out are significantly faster than my own results.

Think back... did 6.8gr FEEL like a max load to you?

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by spartacus » 07 Jul 2011, 09:19

Look a little bit lower on their data, they have a specific load for the hornady v-max, for some reason they say it creates a lot higher pressure than the other 40 grain you are looking at (45,100 PSI with 7.7 gr vs 48200 PSI with 6.8 gr):
5.7x28 FN
Barrel: 5" ■ Twist: 1-9" ■ Primer: WIN WSR or WSP ■ Bullet Diameter .224"
No.5 35 HDY V-MAX FB 6.0 1,955 6.7 2,100 45,500 1.491
No.5 40 SIE SPH 5.8 1,850 6.5 1,975 45,200 1.456
No.5 45 SIE SPH 5.7 1,740 6.4 1,875 45,400 1.490
No.7 35 HDY V-MAX FB 7.4 2,041 8.2 2,197 45,200 1.491
No.7 40 SIE SPH 7.0 1,896 7.7 2,044 45,100 1.456
No.7 45 SIE SPH 6.7 1,782 7.4 1,913 45,400 1.490
No.5 40 HDY V-MAX 5.1 1,657 5.7 1,875 48,000 1.580
No.5 45 SIE SPT 5.0 1,558 5.6 1,746 47,800 1.580
No.7 40 HDY V-MAX 6.1 1,679 6.8 1,880 48,200 1.580
No.7 45 SIE SPT 5.9 1,568 6.5 1,782 48,300 1.580


I'm not even trying to argue that 6.8gr is a max load, I'm just saying it should be at least comparable to a factory load so I would have assumed that the spring would cycle with it. I agree that the velocity probably isn't what they publish but from what I have seen the factory ss195 doesn't pass 1700fps so even if accurate embellished the data by 200 fps (they publish it at 1880fps) then the two rounds should be pretty comparable. I haven't chrony'ed those loads or anything so I guess it is possible...

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Grantness » 07 Jul 2011, 09:34

My print-out doesn't have any of that, but I cut off the "special notes" because they were either obvious, irrelavant, or just plain wrong. *Want to see just plain wrong? Check out that Lyman manual :lmao:* Ignore what they wrote. If anything, the VMax will do better. Clean it, lube it, try it out with something closer to 7.0gr or greater (if you aren't interested in stronger loads) and see if you get the same problems. I've personally gone a bit over 8gr w/ Nosler Ballistic Tips. Or better yet, get some SS195 blue box (the weakest round they sell thats not subsonic) or SS197 and try that out. Do you own a chronograph?

As Jay pointed out...the whole reason for an HD spring is to increase velocity and handle stronger loads (not to mention the shorter brass ejection distance). If you want to shoot min or less than min target loads, just swap the springs out...doesnt take long w/ the right tools and techniques.

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by spartacus » 07 Jul 2011, 09:48

Thanks for the help Grantness. I typically shoot stronger loads but do load up some target loads once in a while for plinking, I'll test it out with some ss195 and some stronger loads to see how it does. I might just have to go with a little hotter load for plinking.

Did you start to see any signs of pressure when you loaded the v-max past 7.7 grains? I'm kind of scared to push this round from all of the stories of the round being so finicky, I've gotten it around 7.4gr with no pressure signs but haven't dared go much higher.

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Grantness » 07 Jul 2011, 09:55

Well, first of all there are ways of detecting overpressure-signs. I wrote an article easily found in the reloading section of the Wiki. But common sense it the main thing. If there's too much kick and freaky black smoke coming out the back (along with pierced primers and such)...then you're pushing it. Second, iFire recently described a difference between "new" and "old" acc#7, which might explain the discrepancies i've seen between their posted loads and my own results. If you're powder is relatively new (within 3-4 years or so) then its probably the new manufacturer...and you can use higher max loads. Third, loads posted by major companies usually err on the safe side for legal reasons. Fourth, don't quote me on this, but I doubt you could fit enough powder in the case (uncompressed) to cause problems :D Fifth, the HD spring theoretically ought to allow for a higher max load.

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by panzermk2 » 07 Jul 2011, 13:21

Grant thanks for covering, what you said is spot on. I was very busy today.
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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Grantness » 07 Jul 2011, 15:33

NP :thumb:

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Grantness » 20 Jul 2011, 09:18

Can;t find the instillation vid here or on youtube :?: mainly looking for the size (metric or otherwisP snap ring pliers... In my case Im trying to put a new one on. That one the guy at lowes took off w/ his knife flew off twice. Second time lost it, but its warped anyways. Definitely dont take shortcuts installing/reinstalling!

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Buffman » 20 Jul 2011, 09:23


Grantness
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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Grantness » 20 Jul 2011, 09:24

Thanks man!

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Re: EA FsN Heavy Duty 20 pound Recoil Spring.

Post by Rapier1772 » 30 Jul 2011, 17:12

On the light load topic - I installed the new spring (very easy procedure if you can manage that smeggin' snap ring) and feed lip thingies this week & took it all for a drive today for subsonic testing.

Out of 105 low power rounds, I only had 3 failures to eject & I think 2 were because the brass didn't get the case lube cleaned off well enough & it was just too dirty to eject. There was one feed jam but that was because the feed lip thing didn't stay put.
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