Royale barrel/calibre question

Yep, no problem at all, a Royale action block can be fitted with the .177/.22 and .25 barrel, just install the barrel and probe and you are good to go.
Ofcourse there is also some tuning work involved, but that's pretty obvious.

I have transformed my .177 Royale FT in a CZ barreled 22cal. 44ft/lbs monster to shoot the heaviest 22 pellets

LOL, that made me laugh! Yeah, Yves' Boss .25 is a beauty for sure. Sweet gun and a absolute tackdriver.
I haven't been active here for a few months, because I simply didn't have the time and energy to respond. Too many projects.
The Royale/Boss based guns are still among my favorites, very easy to work on and very reliable. Very efficient and powerful as well.

I read you post regarding a possible barrel change to an STX barrel in the Royales, but that is not going to work because the X liner diameter is 10mm, and that's also the diameter of the brass transfer port of a R400/500. Good thing is, there are plenty of other barrel options that can be made to fit the Royale's action.
However, the Boss action can adapt the x barrels because the barrel diameter at the breech end is bigger.

"Glem.Chally"Yeah I did some more thinking about the STX and from some responses here, was a bit of a half baked idea. Couple questions if you don't mind.
I don't have a lathe personally or know how to use one, a good machine shop shouldn't have a problem cutting in the o-ring groove for the pellet probe at the muzzle end if I were to use a non-fx barrel blank?
The barrel inlet is brass on factory barrels how is it connected to the steel barrel? Is the brass a sleeve that goes over a thin steel section?
Did you use brass or just machine the barrel muzzle end to the size of the brass barrel inlet?
No rush, and thanks again for the advice.

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I always use a brass inlet as well, because it is easy to machine, and it is totally sufficient for PCP airguns. This brass fitting is threaded on to the steel barrel (M9x1 thread in case of the Royales) These brass TP pieces can be ordered at FX, and are not very expensive. 
Turning a barrel to fit is pretty straight forward for a machinist, just be sure that the bore is running true in relation to the axis of the lathe.
Same goes for the crown, the bore should be aligned to run true before crowning.
I'll post some images of the Impact barrel I did when I had one, just to give you an idea.

Kind regards, Gijs

weatherby. Great information. Quick question. I have been expirmenting with making some barrel changes on the Wildcat. Because I didn't have the brass FX end to thread on the barrel I just machined the end of the barrel to the same specs as the FX brass end. Is there an advantage, or disadvantage to what I've done? Thank you. Sylvan

"Kitplanenut"weatherby. Great information. Quick question. I have been expirmenting with making some barrel changes on the Wildcat. Because I didn't have the brass FX end to thread on the barrel I just machined the end of the barrel to the same specs as the FX brass end. Is there an advantage, or disadvantage to what I've done? Thank you. Sylvan

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Hi Sylvan, I did a few barrels the way like you did, but it is a bit more difficult because steel is harder to machine than brass.
Another downside, when you mess things up by accident (e.g. drilling the TP, making the internal o-ring groove), you have to cut the barrel and end up with a shorter barrel than intended
Some plusses of the brass piece, you can make a nice pellet entry in the barrel itself, you can actually see what you are machining because you are not working inside the bore itself.
When you are trying out different types of barrels in the same caliber, you can use the same brass TP piece and just thread in the new barrel.
And another advantage, although not a big one, the final finished length is around 12-15mm longer, because a small part of the barrel is formed by the brass piece.
Main reason for me, it makes life a lot easier if you are machining brass i.s.o. steel, especially when turning the internal o-ring groove for the probe.

kind regards,

Gijs.