Tuning FX Impact X MKII .30 700mm tuning

[mike8908]

I just picked up a FX Impact X MKII .30 with 700mm barrel and 44.75 grain JSB pellets I wanted to see if anyone knows a good sweet spot for FPS with those pellets for a good balance of power and accuracy up to 100 yards.

Thanks again!

 

[cfs916]

890-920fps

 

[mike8908]

Thanks! How about the JSB 50grain?

 

[Cliff_Allen]

Thanks! How about the JSB 50grain?

I think generally speaking, you're going to want to try to launch any diablo shaped pellet at speeds of no more than 920ish fps. You can go higher but generally will lose efficiency, stability and accuracy (not always, just a general guideline) The weight of the pellet will determine how much energy is being put out at those speeds. 

If you want to go much higher in fps to get more power you would want to look at airgun slugs I believe. There are many here that know a lot more about slugs than I do.

 

[mike8908]

Thanks! Yes, I’m going to get a slug liner later on so I can. Thanks for the help!

 

[Mrshosted]

50 grain = 825fps with a slug "A" liner