Tx200hc .177 to .25/.22/.20 calibre change

[Sir rocco]

As above, is it as uncomplicated as swapping the barrel or would the spring need changing and then tuning.
Thanks.

[robthedog]

Yes it is, i had mine done by Paul Short, swopped my HC from .22 to .25, makes a very good platform for the .25 cal

[Neil54]

You may find going from .177 to .25, the spring may needing shortening as .25 should make power more efficiently.

[MeHadger]

It may be just as simple as removing the piston weight when you change, but will almost definitely need detuning to some extent.
.25 HC sounds like a great rifle 👌🏽

[rapidresponse1]

sounds good in 25 cal

[Sir rocco]

Thanks for the replies,it was just a thought, i find a .177 pellet is quite tricky loading into the breech due to my old fingers so was thinking a .25 would be easier and i want to keep this gun.

[Waddy]

.25 pellets are way easier to manipulate & the calibre is a lot of fun, but I would think that the spring will either need shortening or swapping for a shorter one of the same dimensions, ie ; OD, ID & wire size.




.

[Shed tuner]

for the same spring/powerplant, roughly:

.177 baseline
.20 + 1.5 FP
.22 + 2 FP
.25 + 1 FP

In case you are wondering, .25 is air hungry, so loses bore pressure quickly unless you have a large swept volume... A mk3 has a medium volume, and a fairly short barrel so doesn't suffer terribly. A mk1/2 will show only a very small increase going from .177 to .25

[Daveo]

Can you buy an off the shelf .25 barrel for a TX?

[Shed tuner]

Can you buy an off the shelf .25 barrel for a TX?

nope, only .22 and .177. But it's not a tough machining job.

[Sir rocco]

Thats what i found out so i expect to keep struggling with .177 and wait for a gun swap to come up,
Thats what an old informative thread i found on here concluded when somebody wanted to go .22 to .177 a few years back.

[jonnyone]

Yes it is, i had mine done by Paul Short, swopped my HC from .22 to .25, makes a very good platform for the .25 cal

I can vouch for this. As the new owner i can say the gun shoots as sweet as a sweet thing in .25
Dave