FX Impact .30 cal barrel choked?

[ShootStr8]

I tried Googling found nothing useful.

I tried gently nudging a JSB Exact Diabolo 50.15gr .30 cal pellet down the barrel from breech to muzzle and was surprised that it was such a snug fit. However, as the pallet approached the muzzle, resistance greatly increased to a considerable amount of force to get the pellet through. I triple checked my barrel for irregularities before and after and it's flawless.

I thought they weren't choked?

I've not yet tried measuring the barrel with calipers since I don't want to remove my transfer port or the front threaded end cap.

I did measure the pellet cross section diameter at multiple points before and after nudging it down the barrel.

Before: The diameter measured at .307 to .308.

After: The diameter measured at .299 to .300.

So whether it's tapered at one end or not, my barrel took 8 thousands off the diameter. 



Are JSB .30 Cal too big or is this normal?



Thanks

 

[Glem.Chally]

All FX barrels are choked. 

 

[Patrick]

That’s normal, I’ve done it with the 44grains to check the marks on the pellet.

but as u say, till the end u have to put a serious amount of force.



do u shoot only the 50grainers?

 

[ShootStr8]

All FX barrels are choked.

Ah! Not sure where I got the idea they weren't. Good to know, thanks.

 

[ShootStr8]

That’s normal, I’ve done it with the 44grains to check the marks on the pellet.

but as u say, till the end u have to put a serious amount of force.



do u shoot only the 50grainers?

Actually, I've not used my .30 barrel yet. I only got the Impact a few weeks ago w/ the .22 barrel and I'm still enjoying that. I came from a .22 springer so switching to a PCP has been a pretty awesome upgrade by itself. Mostly backyard plinking -- keeping myself entertained during the pandemic.