Author Topic: Marauder tune made easier (Read 23536 times))

npunk42 · « **Reply #60 on:** November 25, 2014, 08:22:11 PM »

I have been reading this thread, impressed with what results some folks are getting. I wonder how two persons with the same starting parameters can result in different setting recommendations. Both Wimpanzie and Marty specified an 850fps tune with 18.13gr pellets, with the ES at 30, yet the setting given by your program are different for each. These are the parameters I would have sent you, so I expect to try them both this long weekend. Im not being critical, just quizzing.

shorty · « **Reply #61 on:** November 25, 2014, 09:09:42 PM »

Everyone's gun is different. Even though they might be the same caliber and make, the settings could be different.

I think the difference here was that one was a gen 1 and one was a gen 2. I could be wrong though.

npunk42 · « **Reply #62 on:** November 25, 2014, 09:18:36 PM »

okay thanks, I didn't consider that. That's something you have to input in your program?

shorty · « **Reply #63 on:** November 25, 2014, 09:50:42 PM »

The statistical software doesn't matter what kind of gun or machine it is.

PlanB · « **Reply #64 on:** November 26, 2014, 09:51:15 AM »

I need help please

22 synrod
790 fps
3000 to 2000 psi
Small spread as possible
18.13 jsb
Thanks

npunk42 · « **Reply #65 on:** November 26, 2014, 01:01:51 PM »

Quote from: shorty on November 25, 2014, 09:50:42 PM

The statistical software doesn't matter what kind of gun or machine it is.

Which makes me wonder again how the same numbers output different settings. I'll test them both its no big deal, just wondering.

wimpanzee · « **Reply #66 on:** November 26, 2014, 03:24:47 PM »

I never submitted test shot data to properly model the air used in my gun.

I did take the 850 tune provided for someone else, Marty? i didn't read back, and made that a starting point to perform my tune.

I am getting 835-850-835 over 30 shots from 3000 psi to about 1900 psi. I am really happy with those numbers. A full reservoir and 3 magazines and I am ready for a day in the woods.

marty2 · « **Reply #67 on:** November 26, 2014, 04:05:02 PM »

I'll chime in here also.

I just shot 30 pellets over the chrony. Haven't messed with the tune since the last string I posted and have shot approx 700 pellets. Did replace the barrel with another from Crosman somewhere in between. Cleaned, deburred and polished the leade on the new barrel before installing.

Here is what I got:
Start 3000psi
854
855
824---no idea what happened here
862
863
861
863
860
866
865
863
858
863
860
864
863
862
865
862
856
859
857
855
856
852
853
853
848
845
840
End 2000psi

Take out #3 (824), not a bad string. The curve flattened out a little but I'm still happy the tune.

BTW it's a Gen 2 Synrod..

shorty · « **Reply #68 on:** November 26, 2014, 05:23:16 PM »

PlanB,

Charge to 2800 psi and do the 4 tests. No need to recharge between shots. Only need to do one shot per test. Give me the FPS for each shot.

shorty · « **Reply #69 on:** November 26, 2014, 05:37:14 PM »

Marty2,
I am happy to hear you still like the tune. Have you seen any of my posts on the custom hammer spring ? Recently I have got a 20fpe tune with 18.13 jsb's running a little over 20fpe with a 60 shot count with less than a 3% ES. 50 shots were 2.2% ES.

Great tune for within 30 yards and take out just about anything under a raccoon.

Still working on the springs but unfortunately my benji pump failed for the last time so I can't do anymore testing. I need air.....uuuggg

npunk42 · « **Reply #70 on:** November 26, 2014, 09:23:38 PM »

What is the extended tune?

shorty · « **Reply #71 on:** November 27, 2014, 08:45:37 AM »

extended tune is just the tune you asked for plus additional tunes at different FPS and spreads.

marty2 · « **Reply #72 on:** November 27, 2014, 10:29:59 AM »

Quote from: shorty on November 26, 2014, 05:37:14 PM

Marty2,
I am happy to hear you still like the tune. Have you seen any of my posts on the custom hammer spring ? Recently I have got a 20fpe tune with 18.13 jsb's running a little over 20fpe with a 60 shot count with less than a 3% ES. 50 shots were 2.2% ES.

Great tune for within 30 yards and take out just about anything under a raccoon.

Still working on the springs but unfortunately my benji pump failed for the last time so I can't do anymore testing. I need air.....uuuggg

I'd be interested. Keep us posted.

Busta Cap · « **Reply #73 on:** November 29, 2014, 08:46:07 PM »

Shorty:

.22 synrod. Fill beginning at 2500 desired fps 825-850 (bstaley mod)

.25 gen I Mrod fill 2500 desired fps 825-850 (extended air tube)

I have a 3000psi fill so I rarely get that. Many 2500psi fills

Thanks
Carlos

rdhj · « **Reply #74 on:** November 29, 2014, 10:11:52 PM »

Shorty:

I could use some help as i'm not really sure where to start with tuning. Have a stock Gen 2 .22 M-Rod, going to try shooting JSB express 14.35 for field target and get 790 fps to keep me under 20 foot pounds of energy. I have been feeling to 3000 PSI( is there an advantage to filling to a lower PSI?) For spread, I am assuming the lowest spread I can get is what I want for field target.

Right now the gun is set to stock settings per an email I got from crosman and i'm shooting 18.13 grains...12 shots gave me an avg of 840 and a spread of 13 fps...Does that sound good for hunting purposes?

shorty · « **Reply #75 on:** November 30, 2014, 08:35:16 AM »

Busta Cap,
I am not having luck with the Bstaley tune for the .22 due to not knowing the travel of the hammer to the valve. We can do the .25 though.

Here's a tune sheet for the 25.

Fill to 2200 and do the 4 tests. One shot for each test. No need to recharge between shots. I will need those numbers. You did not give me a pellet weight so whatever you do for the tune criteria, make sure you use it for the first shot string.

shorty · « **Reply #76 on:** November 30, 2014, 08:53:39 AM »

RDHJ,
Write down your stock settings before changing them so that you have them if you ever need to go back to them. It also sounds like you do not need to be charging to 3000 psi for the 20 fpe tune either. What I have noticed when running a 20 fpe tune, you never get enough hammer energy between 2750 to 3000 psi to get a low ES through the rest of the string with a stock gun.

If you do want that super low ES and shot from 3000 to say 1750 psi, I highly suggest you look into a regulator.

Here's your tune criteria for what your asking for right now. Just charge to the test psi and record the fps for each test. No need to recharge between shots and only need one shot for each test.

rdhj · « **Reply #77 on:** November 30, 2014, 02:49:51 PM »

Quote from: shorty on November 30, 2014, 08:53:39 AM

RDHJ,
Write down your stock settings before changing them so that you have them if you ever need to go back to them. It also sounds like you do not need to be charging to 3000 psi for the 20 fpe tune either. What I have noticed when running a 20 fpe tune, you never get enough hammer energy between 2750 to 3000 psi to get a low ES through the rest of the string with a stock gun.

If you do want that super low ES and shot from 3000 to say 1750 psi, I highly suggest you look into a regulator.

Here's your tune criteria for what your asking for right now. Just charge to the test psi and record the fps for each test. No need to recharge between shots and only need one shot for each test.

OK, I shot the four test and got some varied numbers

Test 1 = 403.8
Test 2 = 817.7
Test 3 = 828.8
Test 4 = 279.7

This is a new pellet for my gun and after doing the test i left it on test 2 settings but with 3 turns on the spring instead of 4 to see if it would drop the velocity ( got 804.5) , I filled to 2500 psi, sighted in at 25 yards and started shooting field targets at 40 yards....hit it the first time and then i started missing....finally shot for a group on paper (at 40 yards) and it did not come out too good...Guessing 805 fps is not a good speed for this pellet for accuracy?

shorty · « **Reply #78 on:** November 30, 2014, 03:20:07 PM »

RDHJ,
I have 3 tunes for you from the numbers you gave me. These are for a 2500 to 2700 psi charge and should be under a 4% ES from a charge from 2500 to 1800 psi.

700fps tune
VAS = 2.5
HS 1/4" = 2.25
HT 1/8" = 2.75

790 FPS tune
VAS = 3
HS 1/4" = 2.5
HT 1/8" = 1.5

850 FPS tune
VAS = 3.25
HS 1/4" = 2.75
HT 1/8" = .6

Choose one of the tunes and shoot a full string from 2500 or 2700 psi down to 1500 to 1800 psi. From there you will know where you will get the lowest ES%.

Post some numbers when you get a string.

rdhj · « **Reply #79 on:** November 30, 2014, 03:59:32 PM »

Shorty:

something may be way off....i just set the gun to the 790 fps tune, filled to 2500 psi and took the first shot and ended up with 865.2 fps.....pretty far off

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Marauder tune made easier

Author Topic: Marauder tune made easier (Read 23536 times))