.25 jsb heavies and smooth twist barrels

[Guest]

Hey guys. Just wondering what everyone likes more , the mk1 or mk2 heavies in their fx guns? Which are more accurate for you? Thanks

 

[BitFrost]

Not tryin to thread-jack here but gotta shoot in a question very related to yours.
Has anyone tried the JSB .25 King Heavy in a FX Wildcat factory tuned? How was is and at what speed are they flyin at?

 

[chasdicapua]

Hi FastEddie, I just got a Royale 500 and will let you know once I shoot some. Need to bring up the umph on the gun though as it's only shooting the kings at around 881, so the heavies would be around 770 which is probably too slow for good accuracy.

 

[Guest]

My wildcat shoots the mk1 heavies at 810 fps and the mk2 at 825 fps as their skirt isn't as big as the mk1 heavies. Their both more accurate than the 25.4 kings and in my rifle their almost the same in accuracy, maybe the mk2 are a little more consistent. I'm going to try to up the fps a little and see if there's any more improvement but these 33.95 heavies are great. Right now all I shoot are the mk2 heavies. Very accurate.

 

[chasdicapua]

Great to know that the MK1 are shooting good at 810. I should be able to get the power up to that no problem.

 

[Ramvan8]

Bitfrost. I just chrony'd my FX Wildcat .25 caliber tonight.
The chrony was about 12" in front of the muzzle. 
Measured 10 shots each, took the average fps and calculated the ft lbs. 
The JSB 25 grain avg 790 fps (34.68 ft lbs energy)
The JSB Heavy 34 grain avg 706 fps(37.65 ft lbs energy)
I find that the 25gr are more accurate. But the 34gr are a sledgehammer for hunting.
Both pellets go right through a 2x4 at 18 yards (so be aware of your back stop)
Hope this helps. 

 

[Guest]

Hey Ramvan8. Those numbers seem to be about 100 fps too slow for both pellets. Did you tune it down or is that how it came?

 

[P.Shooter71]

I just ordered 4 tins to try out , should be here tomorrow and I'll give you my thoughts afterwards . They are the heavies MK ll.

 

[DrippinLead]

I have some heavies but not sure if they are MK1 or MK2's. How do you determine which is which. My impact is shooting the Heavies at 850-860 and can shoot the kings up to 960 on the max setting. Does anyone think that around 900 fps may be more accurate for the heavies?

 

[Guest]

On the cover of the tin it will say MKII. Otherwise they are MKI .

 

[DrippinLead]

Ok then mine are MK 1's, That may explain why they where harder to push into the barrel. I will get some MK 2's and see if they are more accurate and report back.

 

[DrippinLead]

Just tried MK 2's this weekend. Wow what a difference. They work much better than MK 1's in my FX Impact. One group was basically one small hole which was almost pellet on pellet at 50 yards. I could not be more happy with the performance! My .22 barrel will not come close to this!

 

[Guest]

Good to hear daystate!

 

[chasdicapua]

In my Royale 500 the regular heavies are grouping better than the MK2's at 60 yards. The heavies fit much more snugly in the barrel than the MK2's. It's very easy to feel the increased resistance when pushing the probe forward. Only shooting both pellets around 775 though, so need to bring that up to about 840 - 850 to get the full benefits of the pellets design. But I imagine, that due to my particular barrel liking the heavies fitting snugly, that at the faster FPS they will still be accurate than the MK2;s.... But, we shall see.

 

[chasdicapua]

Daystate, I would be curious how the kings shot at 900 compared to 960. I'm going to have my Royale 500 tuned and that info. would be helpful.

 

[FXSHOOTER]

I am going to get some next time. I was told that someone was getting 60fpe with them from aN FX BOBCAT and FX IMPACT

 

[fuznut]

Where you guys getting the JSB heavies MK2 s from? AOA said May MAYBE!

 

[Guest]

Pyramid air

 

[fuznut]

Fast Eddie THANK YOU will give em a call.

 

[Monkyshine]

SS also has them stocked.