FX FX Crown .30 cal. tuning for slugs.

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No problem. The superior liners are designed to be used with lighter slug weights. I use a 500mm superior barrel in .22 to shoot slugs in my mk1 Crown. Normally shoot 25gr @950fps thru it. Use these same LDC slugs and they are extremely accurate and devastating. Bit on the lighter side for .22 slugs, but speed and accuracy is there.
 
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I've always heard, from forums to YouTube videos, that "superior" liners are fine for "lightweight" slugs. I have had no great success in shooting lightweight .22 23 gr slugs or .25 26gr slugs through a STX Superior liner. It wasn't until recently I said, F$#% it, I'm just going to get a heavy liner in .25 and retest all of these .25 slugs I have piled up on my shelf. I saw immediate improvement in consistent groups AND I wasn't fouling my barrel after a few mags. So with that being said, I have a firm belief that if you want to shoot slugs with the best results, just get a heavy "slug" liner. That is just my experience through.

I never tried shooting slugs through my .30 STX superior liner. The twist rate is 1:40 and I'm not even going to bother making the attempt. My guess is your Crown has the same twist rate.

30 STX Superior Liner.jpg
 
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To counter that, I would say try the superior first. I've had a slug A liner for my .22 and it fouled up pretty badly. The superior is much much better. Also not ammo picky at all and accurate with a wide range of slug weights and styles. The slug A liner was VERY picky. But I also have the superior liners in my 22 and 30 barrels reinforced with the carbon liner tube from Ernest Rowe. I think this helped the .22 at least in terms of ammo pickiness and tune sensativity. Both of which it exhibits very little of.
 
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Long_Gun_Dallas said:
To counter that, I would say try the superior first. I've had a slug A liner for my .22 and it fouled up pretty badly. The superior is much much better. Also not ammo picky at all and accurate with a wide range of slug weights and styles. The slug A liner was VERY picky. But I also have the superior liners in my 22 and 30 barrels reinforced with the carbon liner tube from Ernest Rowe. I think this helped the .22 at least in terms of ammo pickiness and tune sensativity. Both of which it exhibits very little of.
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I agree with this approach. Try what you have first, then try a different liner If you cannot get satisfactory results.
My experience with a 500mm barrel and slugs was not a positive one. I never tried a different liner and just stuck with pellets. But, I have several other guns to shoot slugs out of.
My wife’s M3 did not want to shoot slugs, even light ones with the original liner. Out of frustration I bought a heavy slug liner and things improved dramatically Even with light slugs like 23 and 24.8 gr ones.
 
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I would've suggested to go ahead and try the superior first too but as soon as I saw it was a 30 500mm with a 1:40 twist I knew he was doomed. It's just too slow of a twist to stabilize a slug.

My .30 500mm shoots JSB 44gr pellets so good I'll never mess up it's mojo by contaminating and/or cursing it with a slug. :LOL: Gonna keep that thing a slug virgin forever. :ROFLMAO:
 
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ok, still need help and some kind of direction, I am loosing hope here.
Gun specs again:
Crown MK2, 30 cal, 600mm barrel SXT Superior 1:22 liner.

I got me NSA Slugs boxes of each caliber from 44.8gn to 60gn and all in between, tried them all with stock hammer, playing with hammer adjustment and best I was able to do is 140BAR on reg 830FPS with 44.8GN slugs, accuracy was not there, at 40 yards I get get few shots in one hole them bunch of flyers, was not happy with 2-3" spread.

SO I figured I need heavier hammer to get me faster speed to balance slug better.

Upgraded hammer, got me to 150BAR after testing all hammer spring settings settled on #16 getting them 44gn going 920FPS, tried all of them slug weights and same thing, few good groups and again all over the paper, 40 yards with 2-3" flyers.

Kind of lost at this point, what am I doing wrong here.

I can shoot gun very well, I shoot my rifles 100-600 yards with sub MOA results all day long and I can't stack 40 yards, what?

If anyone can point me in the right direction, please help.

I chronoed my shots, the groups with flyers and I get extream spread of 15-20 on avarage and SD is usually single digits.
 
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Discovered something.
Took my liner out for cleaning, is this gap normal?
O-rings are fine, they are covered in silicone, but they are perfectly fine.
I tried tightening up and it was not going, so I took that brass part off and measured depth of the threads and what you see here is max I can screw it in, that is it, it bottoms out on inside.
I was looking at photos online and I don't see any space on the photos I see, this puzzles me
Thank you

IMG_1305.jpg


IMG_1306.jpg
 
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Bigragu said:
On a 30 that gap is normal and one o ring(furthest from the transfer port) is a different size than the one closest to the TP. On other calibers, both o rings are the same in size. Just the FX 30 cal STX barrels the two o rings differ.
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Appreciate your post.
Any input on my post above this with slugs grouping issue?
Thank you
 
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Took a part regulator.
I have about year old FX Crown MK2
Regulator has 11 washers, single paired, last stack towards the end is 3 washers two inward one opposite like this: ()()()()(()

Going to re-stack it, should I get rid of 11th washer and double stack 10 like this: (())(())() ???
or keep 11th and stack like this: (())(())(() ?
Not sure if 11th was a mistake and I need to get rid of it or keep it.
Please advise.

Also brack housing has 4 holes as you see in the threads, all 4 had some magor bur on them, almost half of the hole was blocked on all 4 of them, I cleaned them off and they are perfect now.

thank you.

IMG_1309.JPG


IMG_1313.jpg
 
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