FX STX Super light weight 700mm barrel on a FX Crown Question!

[sharkman]

I’m thinking about buying one for my Gen 2 .30 cal FX Crown to see if I can increase the speed of the pellets... in theory it’s a simple way to increase speed and then tune down to get the most accuracy. A couple of questions though that I haven’t seen answered :



1. If I’m sticking to the same cal do I need a new pellet probe? Do the new light weight 700mm barrels require a different probe? 




2. Has anyone done this on an “older” Crown... meaning Gen 1 or Gen 2? What kind of results have you seen? 

 

[Spray1Mark]

The Crown probe is the same regardless of barrel type, personally after trying a 600mm VS 700mm on the Crown the velocity difference is minimal and 700mm is extremely unwieldy, especially when you add an LDC or mod.

 

[Nathan]

I’d hold out for the 900mm barrel. (kidding)

 

[Long_Gun_Dallas]

Same probe will work. I'm getting a 600mm barrel for mine. I have a 700mm in 22 cal. It gets the job done (65fpe) but I think I could get nearly the same results in 600mm in 22 as well

 

[0akhonor]

To echo Spray1, 700 mm is loooong. Velocity is nice, but using a jousting lance - it takes some time to get used to.

They do add velocity tho...

 

[Spray1Mark]

To echo Spray1, 700 mm is loooong. Velocity is nice, but using a jousting lance - it takes some time to get used to.

They do add velocity tho...

Sorry maybe my post didn't make sense, I almost always find that I gain 40-50 Feet per second when going from 600-700mm regardless of caliber.

However what I also see is that a 50g .30 cal JSB pellet gives up almost nothing to a 44g .30 cal JSB in terms of speed in any of my .30 cal liners, hence I just plop for using the 50g, as it's almost like getting free energy.

However for some reason when going from 600-700 with the .30 cal CROWN and 50g JSB I gained almost nothing, I hope that makes sense? perhaps 84FPE with the Crown in .30 cal stock form, is as much as you can get without doing modifications regardless of barrel length over a certain point?

Maybe someone else can explain?

 

[scratchcoobster]

You will get a power jump from 600 to 700, but that barrel is very cumbersome. If you feel you need that length, it would be better in a Bullpup or Impact configuration.