Spring Swap Numbers for IRENE

[brent]

This is meant to be a resource for anyone who will be switch springs out for IRENE.

Measurements with .25 KSC bb's

My ICS M4 (stock spring, m120)
380, 375, 380, 385, 380, 380, 380
AVERAGE=380fps <-To Hot For IRENE

Put in a Guarder m100 spring
AVERAGE=320fps (97.8 meters/sec)

Barrel is the stock ICS barrel. Advertised is a 6.05. Going to try and recover some fps with a tightbore.

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IRENE CORE RULE SET (with .25s) for non-sniper weapons

Anything up to 366 fps is ok
Caution Zone 366-376 fps <-subject to spot checking
Anything above 376 fps is NO GO.

Make sure you all take appropriate actions to be legal.

[DOc]

IMPORTANT NOTE!!!!

If you switch out any mechanical parts of any gun you are using for irene then you have to re-chrono your gun after fixxing it. So just be prepared if you break you r gun open. But yeah, I will post info later. DOc

[brent]

yeah, i plan on getting everything ready to go before we get to KY.

[brent]

NEW INFO

Ok I just chrono'ed with the G&G .25 Earth Friendly rounds. Since they are not near as high quality as the KSC Perfects it will bring your speed down a bit.


Data. I am using the setup in bold
KSC .25's m120 ICS 6.05mm barrel 380fps
KSC .25's m100 ICS 6.05mm barrel 320fps
G&G .25's m120 ICS 6.05mm barrel 357fps
G&G .25's m120 Prometheus 6.03mm 366fps

*NOTE: the m100 is a Guarder. So with the rule of thumb, it can basically be regarded as an m110.

So as you can see from test 1 and 3; the only change was between the KSC and G&G ammo and there was 23fps difference. Good news is that it let me put the m120 back in. After I took the tightbore back out I was much closer to the target speed.

Test 4 is actually right on the money with 366 being the HIGHEST non-caution speed allowed with .25's. But that is an average speed so there were several rounds that flew a few fps over the limit. I would rather give up about 10 fps and play it safe.