Tuning 12fpe FX Boss?

Glem.Chally · Dec 10, 2020

I was thinking I need a 12fpe .177 and was shopping around a bit.

But then I got to thinking why? Why not use something more quality that I already own. I also don't want to adjust the reg down in it so it does need a bit of hammer weight to overcome it being set at 150-155.

This is a .22 Boss with a 600mm LW polygon, I can also put the 500mm STX from the impact on there with the slug liner. Tried using no hammer weight but was valve locking, but the R500 one would be too much. So I tried the older 4 gram HW from the impact and it slid right in the hammer, perfect!

Shot strings nice and stable at around 610fps with crosman domes.

Love these guns!

Odoyle · Dec 10, 2020

FX guns tend to shoot really smoother and docile when power is backed down from what I noticed and some shoot the cheap Crosman Premier Hollowpoints very well too when power backed down.

Healthservices · Dec 10, 2020

Just curious if your impact barrel had two transfer ports. And whether you tried the smaller one.

Glem.Chally · Dec 10, 2020

Just curious if your impact barrel had two transfer ports. And whether you tried the smaller one.

No I dont have those new transfer ports.

Odoyle · Dec 10, 2020

Probably easy enough to drill a hole on the opposite side of the brass and put the notch. I would definitely start small and work it up larger if needed. Can always make bigger hole but not smaller. Maybe even crazy idea 4 position index holes 12 and 3 and 6 and 9 o clock positions all with index notches all different diameter holes.

I get ROYALTIES!!!

Glem.Chally · Dec 10, 2020

Nah it's already done with 2 mins work and no drilling. Dial back HST and put in impact HW literally took 2 mins.

Also this is a .22 in a Boss so I have a stainless adapter that slides over the Royale (smaller) brass transfer port. Round stainless ain't so easy to drill.

* I'm not looking for tips just sharing what I did.

Healthservices · Dec 10, 2020

Sounds like you did good. Did shot count go up any?

Glem.Chally · Dec 10, 2020

Yeah I'm sure it will greatly, should be a few hundred forsure.

Hobbyman2007 · Dec 12, 2020

I’ve been playing with 12fpe tunes lately in a couple rifles , one is the HW100 in .22 and the other is a Disco Frankengun with 500cc bottle in .25 . Both are running at 70 bar reg pressure with very little hammer strike. The .25 trajectory is a little loopy as expected but I also shortened the stroke via extending the front of the hammer. Very fast lock time . Really fun to shoot both. And as expected the shot counts are triple what they were. Maybe the Brits are onto something .

Mrshosted · Dec 13, 2020

Why don't you turn the transfer port wheel down to low, close down the regulator to 70-80 bar and clip a ring off the hammer spring?

Glem.Chally · Dec 14, 2020

Why don't you turn the transfer port wheel down to low, close down the regulator to 70-80 bar and clip a ring off the hammer spring?

Because the Boss doesn't have a TP wheel, the reg doesn't go that low and I don't want to cut anything. None of these are necessary to get 12fpe in .22 with it.

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Tuning 12fpe FX Boss?

Glem.Chally

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Odoyle

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Healthservices

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Odoyle

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Hobbyman2007

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Glem.Chally

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