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All Springer/NP/PCP Air Gun Discussion General > Turkish AirGun Gate

Hatsan 135 25 cal fitted with 125 barrel equals more power?

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Dan Jefferies:
Like my mama said I'm dumb as a box-o-rocks so bear with me. If this is the wrong section see my previous statement.

The 135 in all configurations (177-30 cal) has a 10.9 inch barrel MUCH shorter than the 125. It also has a greater swept volume. I believe the barrel length was chosen to accommodate the 30 caliber version and with its greater swept volume the smaller calibers kept their fps ratings. So while the .30 caliber uses all the air available the smaller calibers are wasting a LOT of air.

My proposal is to use a .25 caliber 125 barrel on a .25 caliber 135. It should fit no problem. Sounds like a major power boost to me.

Good, Bad, Ugly? All comments welcome ...)

Privateer:
I'd say put an H&N 19.91 .25 over a chrony and see what the 135 does.
I know I got near 750 FPS in the 125 Sniper.
Will Chrony the 135 with that same pellet in a few days when I get home.

grimeszee:
My 135 springer shoots H&N FTT 19.91g @ 827 fps for 30.1 fpe.

Dan Jefferies:

--- Quote from: Jeff aka Privateer on October 23, 2017, 08:03:37 PM ---I'd say put an H&N 19.91 .25 over a chrony and see what the 135 does.
I know I got near 750 FPS in the 125 Sniper.
Will Chrony the 135 with that same pellet in a few days when I get home.

--- End quote ---
Please do...19.91? So you have the .22 caliber 135? *edit* My reading comprehension skills seem to be lacking....

Dan Jefferies:

--- Quote from: grimeszee on October 23, 2017, 08:17:04 PM ---My 135 springer shoots H&N FTT 19.91g @ 827 fps for 30.1 fpe.

--- End quote ---
At your speed you're getting 30.24 fpe...If a simple barrel change ups it to 1000 fps (just 173 fps) that would come out to 44 fpe ...wow... that's why I'm so interested ... 2 extra inches just might add, just, add the 173 fps needed...*edit* at 950 fps,  just 123 fps more your power would be a solid 40 fpe... still wow....

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