Fx crown tune

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wolfie

Member
Apr 22, 2015
338
5
Pays de la Loire, France
Hi guys

Some advice please.

Think I have adjusted screw in adjustment to meet power wheel cam close to it's maximum.
What I am trying to achieve is consistent mk2 heavy results for longer range targets at 100 metres 
Previously fliers and inconsistent group 2.5 inch etc BEnch Rested.
Results at the moment
All at 130bar reg pressure, 
Jsb 33.95 mk 2
Power level (PL) 6
820/825/824/820/828/821

Jsb 25.39
PL 6
908/916/904/903/914 - think too fast
PL 4
903/907/907 also to fast

PL 3
891/893 think better

Ok should I increase reg to say 135.

Not looking for max power but good shot count and accuracy with mk2 plus ability to reduce PL down via wheel for consistent 25.39 shooting.

Do not want to tinker with belleville washers or go to close to max reg bar 150.

Your opinion would be valued. 
Happy to send longer strings of say 10-16 . All results were single loading no magazine
Normally fill to 220/230 bar and prior to tinkering was getting about 70 shots for 220 ish fill. No pellet sizing, no lube barrel cleaned about 100 shots ago. Gun shot about 1000 rounds.

safe shooting
 
My gun's reg. pressure is 140bar, hammer spring is adjusted almost to max. Shooting the 25.4 @ 940 and it's super accurate. Shoots the 33.95 @ 835 also super accurate. I don't mess with anything anymore, it's absolutely dialed!!! I bought my gun set at 130bar and it shot good, bumping it a bit made it a one hole gun. At 140bar I fill to 240bar and get around 65 shots. Every gun is different but it can't hurt trying 135-140bar. Stoti
 
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My Crown in 25 is as delivered 130 bar regulator, 940 fps with JSB 25.39 gr pellet without moderator and 900 fps with. The gun shoots much better than I do. I don't mess with it. Your numbers are pretty damn good as is. If you want more 100 yard accuracy a heavier pellet and a bit more twist in the barrel. I believe the new X barrel was developed around the JSB 25 grain pellet and it is 1 in 30". A longer, heavier pellet with a greater sectional density and BC. Then again, too long won't fit in the magazine, but I think 1-18" is the right answer. I wouldn't do anything until FX releases its slug barrel. Don't mess with what ain't broke!
 
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I thought I would add a bit more here ..

My Crown was not Tuned and those JSB 33.9 gr MK2s were shooting at 830 fps, Reg/120Bar..

Regulator is set now at 140 Bar when Tank is Full at 250 Bar..

Crank in on your Hammer Spring till you hit your sweet spot...

The Rifle Likes these shooting Hot...

Final Tune set at 140 Bar pushing those JSB MK2s at average 880fps....

Ballistics shows 58.35 foot pounds at the muzzle and maintaining around 60% of that energy at 100yrds...

I am shooting Dime size groups all day long at 93 yards as long as my Supply does not fall bellow 150 Bar or so..

So far with my Rifle all boasting claims appear to be true....

It is the most accurate Weapon I have every shot even compared to any of my Fire Arms...

So I am very happy with my Crown...




 
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