FX Crown used to compeate against .25 and .30 calabers.

If i understand the FX X-twist concept correctly, the "X"stands for that exact variable that you (and many of us) would like to know. The twist rate. Until FX makes public the results of their testings for selected pellet brands/types to be used in their X-twist barrels we won't know which pellet is the most accurate in a certain barrel with a given twist rate. My understanding is that FX will release barrel liners of certain calibers and twist rates that are matched (and so labeled) to a selected pellet brand and model. For example, I would imagine: "FX 1:18 twist-rate liner for use with JSB 18gr in the 860-880fps velocity range"

How does/will FX arrive to those X-twist numbers? I am wondering, if they are testing a particular barrel liner and a particular pellet with various twist rates and velocities until finding the best combination for the best accuracy? if yes, is this something that can be replicated without further tests for each new barrel liner that was manufactured the same way (same twist-rate, caliber, port size, etc) so that it performs with the same accuracy for that same (previously selected) pellet? Or they would have to individually field-test each and every barrel to determine the required twist-rate for the best accuracy for a selected pellet?

we will have have to test each barrel. there really is no way around it

i would imagine fx will offer a certain level of specificity such as something like " our testing shows pellet x works best with the following barrel with these parameters..." otherwise people will whine if fx gives very specific data and someone has trouble getting good results with that data. i could be wrong though. 

Fx has already say that they will do pellet testing for each caliber barrel. I only hope they test the heavier pellets .22 cal 25 grain pellet, and the 25 cal 34 grain pellets (not just the classic 18.1 and 25.4 JSB)

From first hand experience I can tell you it's very hard to compete with a .22 against .25 and .30 caliber airguns, especially in outdoor competitions. Their BC values are better which means they have to do less effort bucking the wind in the same conditions. In indoor conditions a .22 can be just as good as a .25 and a .30. There are two things a .22 definitely wins from .25 and .30: air consumption (which leads to quieter muzzle report and more shots per fill) and ammo cost.

I'm currently shooting our 100 meter indoor competition (Netherlands) with a .22 and it can produce the same top scores as any other caliber. Last match was a semi-outdoor match which killed my score by almost 10 points. I also have to watch for who's next to me, some shoot a .45 caliber slug which causes enough turbulence to throw my .22 of it's path.


I'm not trying to say you have to choose a different caliber, pick the .22 for sure! But know that you have to put more effort in mastering the conditions than the higher calibers. But I think mastering the .22 will make you a better shooter overall Especially if you have to find the best twist rate etc. yourself. I think between 1:18 and 1:16 will be sufficient for 16 and 18 grain pellets. For higher masses a slightly faster twist rate will be better I guess.

The Crown will come in .177. .22, .25, and 30 Cal i believe.