Tuning Fx crown .25 mk1
- Thread starter wolfie
- Start date
Install the larger 6.35 MM valve seat, add a hammer weight and port the brass barrel transfer port along with the pellet probe.
You may or may not need a different valve pin to use the larger valve seat depending on which Crown you have. The first Gen. Crowns have two different diameter valve pins in them. The early smaller diameter valve pin will not work with the larger valve seat.
You may or may not need a different valve pin to use the larger valve seat depending on which Crown you have. The first Gen. Crowns have two different diameter valve pins in them. The early smaller diameter valve pin will not work with the larger valve seat.
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Either mod it like this 
or get a 600mm or 700mm barrel .22 caliber change kit and shoot .22 cal slugs.
or get a 600mm or 700mm barrel .22 caliber change kit and shoot .22 cal slugs.
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What velocity are you getting now, and with which slugs?
Do not discount the performance at say 850 FPS or so for accuracy until you actually try it. If you need big power for critter hunting, then by all means turn that thing up.
Try Ghosts advice, and you should be able to get .22 slugs sizzling along proper like.
My method will cost you around 100 bones max, and you will most likely top out around 900 to 925 depending on slug used. You may hit the high 900s with lighter .25 slugs like the Hybrids.
Do not discount the performance at say 850 FPS or so for accuracy until you actually try it. If you need big power for critter hunting, then by all means turn that thing up.
Try Ghosts advice, and you should be able to get .22 slugs sizzling along proper like.
My method will cost you around 100 bones max, and you will most likely top out around 900 to 925 depending on slug used. You may hit the high 900s with lighter .25 slugs like the Hybrids.
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