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Modded mac-1 1322 chronograph results

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StockClassDD68:
So I finally got around to buying an FX radar chronograph, and wanted to test it out on my 1322, mods are as follows

14" mac-1 barrel with all preps and TKO
Mac-1 delrin transfer port
Mac-1 extended probe
Magnum Air adjustable cup seal/valve
Solid roll pin
.038 hammer spring with adjuster (for the rare over pump situations, and to make for a light trigger at 4-6 pumps)
Fluted hammer

That's it for power mods.

Pellet used AA 15.89 diabolo:
6 pumps - 422 = 6.3 fpe
8 pumps - 489 = 8.4 fpe
10 pump - 535 = 10.1 fpe
12 pumps - 575 = 11.7 fpe
15 pumps - 625 =  13.8 fpe

I was going to push it up to 18, 21 and finally 25 pumps but did not see the point at this time  ;)

Very pleased by these figures and wanted to share.

Simplemann:
That's pretty good FPS/FPE. The best Ive gotten out of a 2289 (no mods) 6pumps 425-5.73  8pumps 475-7.16 10pumps 502-8.0 12pumps 525-8.73.

StockClassDD68:
Thanks, that was just to see what she could do, for the pistols I do like speed over slower heavy pellets, so I have settled on the jsb rs 13.43 @ 7 pumps for 7.5 fpe @ 502 fps average. Should be good out to 15 yards, 20 max for chippers and yard vermin (my current comfortable iron sight range for .75-1" kill zones).

Guess it's nice to know a 15.89 @ 20+ pumps with the hammer spring tension up should drop a trash panda or groundhog with a brain shot from the correct angle and 15 yard max.

2A Georgia:

--- Quote from: StockClassDD68 on April 29, 2023, 09:25:14 AM ---So I finally got around to buying an FX radar chronograph, and wanted to test it out on my 1322, mods are as follows

14" mac-1 barrel with all preps and TKO
Mac-1 delrin transfer port
Mac-1 extended probe
Magnum Air adjustable cup seal/valve
Solid roll pin
.038 hammer spring with adjuster (for the rare over pump situations, and to make for a light trigger at 4-6 pumps)
Fluted hammer

That's it for power mods.

Pellet used AA 15.89 diabolo:
6 pumps - 422 = 6.3 fpe
8 pumps - 489 = 8.4 fpe
10 pump - 535 = 10.1 fpe
12 pumps - 575 = 11.7 fpe
15 pumps - 625 =  13.8 fpe

I was going to push it up to 18, 21 and finally 25 pumps but did not see the point at this time  ;)

Very pleased by these figures and wanted to share.

--- End quote ---
There's hope for my project 1322 FTP getting to 10fpe...hmmm
Thanks for sharing

StockClassDD68:
I believe there is hope indeed. I'm just happy that I'm basically getting 1 fpe per pump up to 12ish. That's cool with me, I have a HW44 if I need 18 fpe in a pistol. But there is just something nice about the multipump guns.

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