Tuning Crown Continuum MKII Tuning settings

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Cliff_Allen

Member
Jul 14, 2015
625
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maine, United States
Hey all,

Started playing with the new Crown the other day, put the 700mm barrel on it and have been shooting the JSB 25 grain. I've watched all the Crown tuning vids 2 or 3 times and I feel like I have a pretty good idea of how to adjust the gun. That being said, I can't seem to find that sweet spot for the harmonic tuning. I have about 700 rounds through it now trying different settings, etc and have had a little luck but just can't get to that euphoric spot with the gun where I know it can be.

Best results I've had was with the reg pressure at 125 and 4 clicks to the left with the hammer spring from Max toward Min, transfer port at Max. I'm attaching a pic of the target I've been using and the 4 ten shot groups that were shot at this setting have a dime over them for visual reference. I know these groups look pretty good but I've done a little better with a previous FX 500. My attempt to tighten these up with tiny adjustments failed and I've been unable to reproduce the results. I've turned the reg up or down as little as 1/16 of a turn, dry fire five shots and then try several groups. I feel like I've been up and down the reg and the hammer spring. Mostly trying to keep velocities in the 850 to 890 range.

Does anyone know a good starting point to get the best results? I know all guns are different, just looking for ideas. Also, I have not altered the internal factory hammer spring setting yet.

Lastly, what does it mean if I turn my reg pressure down but the velocity goes up?

Thanks so much! Cliff



All groups shot at exactly 50 yards. Some sighters. The dime covered groups look pretty good here but just not quite good enough I think to hold up at 100 yards, trying to squeeze a little more out. Regardless, have not been able to reproduce those results after changing settings back. No wind when I've been shooting.

20210104_125214.1609786860.jpg


20210104_124842-picsay.1609787085.jpg


20210104_124858-picsay.1609787108.jpg

 
most look good to me ,700 rounds not many for new gun...imo
Click to expand...

You're probably right, I went back and looked at old pics of what my Royale 500 did and it was basically those 4 10 shot groups that are covered with a dime. I think I'm just going to keep trying to replicate that setting and see if I can get back to it. I know what the hammer spring was set to so only need to get the reg adjusted back.



Do you know what pellet it was tuned for at the factory, weight wise that is not mfg. If it was 18 gr you might want to consider doing this.








https://youtu.be/xxrDZmB5egU





Click to expand...

Thank you for the suggestion, that video is super informative. The barrel I have was tuned for 25 grain JSB Exacts. That is what I am shooting. I believe I'll be able to get there, it's just going to take some trial and error I think. 
 
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Cliff_Allen, 

Your groups look pretty good for outdoors at 50 yards.

I've tried so many different "wild" tunes on my Crowns, but I have always come back to, and settled in on, this method which works best for me: 

Remove 700mm barrel and install 380mm barrel. Remove stock and increase hammer spring tensioner to within 3 to 4 quarter-turns away from max. Replace power wheel and turn it to max. Load magazine and fire over chronograph watching fps. Increase regulator a quarter turn and fire over chrono again. Fps should increase. Repeat until chrono fps starts to decrease. Then decrease regulator 1 quarter turn. Fire several more shots over chronograph to verify consistent fps. This is your (nearly)max power(should be over 900fps with the 380mm barrel). Record the final reg pressure for future reference.

Replace stock and shoot on different power wheel/transfer port settings to determine most accurate setting for 380mm barrel. Record settings. Then switch out 380mm for the 700mm barrel(and I would recommend indexing it in the upward direction) and repeat to determine most consistently accurate settings for your prefered ammo. 

This is results in a tune that will give you the ability to use the 380mm barrel, shoot heavy pellets and/or slugs, and help reduce variance in extreme spreads over your shot string.

If you wanna try to dial that 700mm barrel in further, get to the setting that give the best accuracy and then increase or decrease the reg pressure just a bit and see if it make a difference.

Good luck




 
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Quick update. I'm slowly but surely learning the tuning process. Watching the Ernest Rowe master class video a few times has been a great help. I watched Ted's recent video where he says his current .30 Impact is the best shooter he's ever had and what his settings are on it. I was surprised to hear him say his reg is only set to 90 bar. This seems to match AEAC / Steve Chally (spelling?) philosophy that lowering the reg pressure means the hammer spring can strike with less force and the shot cycle is less violent resulting in better consistency or at least easier to achive. 

Anyway, I dropped my reg pressure to just below 110 and adjusted the hammer spring and have played with and tweaked it a few times. The following target is again, almost all10 shot groups with dimes put next to the best groups for reference. It's getting there, but the target that is in the OP still has 4, ten shot groups back to back with no fliers that can all easily be covered with a dime and that is what I am trying to get back to. That is what I used to be able to do with my previous Royale. It's in this continuum somewhere, I just need to find it so will continue playing and tweaking and report back with any meaningful progress. 



All groups shot at exactly 51 yards from the muzzle. JSB 25 grain. ~895 to 900 fps average. Groups in the upper left were all shot yesterday. The upper right and bottom of target shot today after slight hammer spring adjustment. 

20210107_100414-picsay.1610032911.jpg


20210107_100442-picsay.1610032932.jpg

 
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Ghostranger,

I just received my Crown Continuum, but haven’t shot it yet. I understand most of what you suggested, but what reg pressure do you normally start at?

Also, when you said, “and I would recommend indexing it in the upward direction”, what does that mean?

Thanks!



Jason
Click to expand...

Start pressure depends on what you want out of the gun. If you watch the AEAC video breakdown of the Crown and tuning, Steve points out that he leaves the reg pressure at about 155 so the short barrel will have enough power if you turn the hammer spring up and you can still use the long barrel at that reg pressure but just turn the hammer spring all the way down. Technically, you can start the reg pressure where ever you want. The higher the reg pressure, the harder the hammer spring has to be set so that it can open the reg to let the appropriate amount of air out. The lower the reg pressure, the less force the hammer has to hit the reg with, but the reg stays open longer to again, let the appropriate amount of air out. 

I'm not sure what he meant about indexing upward other than if he were referring to the barrel but the barrel is notched so only one way to put it in, unless he was referring to indexing the barrel liner upwards, which just means rotating it up.

I think lol
 
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Jason,

The goal is to find your near max velocity. That will usually correspond to a higher regulator pressure. On the MK2(newest version), start about 140 bar and go up from there. On the MK1(older version of Crown) start about 120 bar. But if yours is already set a little higher than that, just start from where it is.

Note: A higher reg pressure will decrease the amount of shots you get per fill, but the capabilities that you have to shoot higher fps, heavier pellets/slugs, longer ranges, etc... wil increase. This tune will allow you to have the capability to shoot the most sizes(weights) of ammo to the (safe)limits of the gun AND you will have the power to use the 380mm barrel. This tune corresponds to Steve Scialli's(AEAC) "power tune". You can always dial back on the hammer spring(power wheel) and/or transfer port(low, med, high on MK2; or low, 177./.22, .25/.30on the MK1)settings to shoot as "light" or slow as you want too. If later on find yourself always shooting on lower settings(only shooting light ammo at slower speeds), and you don't want the capability of shooting heavier ammo fast/use the 380mm barrel; then you can always remove the stock, decrease the pre-tension screw and lower the reg pressure to get more shots per fill.

The key is to bring them up or down TOGETHER, so they aren't "fighting" each other. 

Indexing the barrel basically means rotating it.

Procedure: Set up a big clean target with a dot in the center to aim at about 25 yards. Fire a 3 shot group at the center dot. Unscrew and pull back the shroud to reveal the brass 15mm nut which holds the liner in place against the receiver. Use a 15mm wrench to loosen the brass nut that binds the liner to the receiver until you can twist the liner by hand. Twist it 1 quarter turn and tighten it back down(it may help to use a marker to make a line on the liner so yoy can tell how far you've rotated it. Make sure not to pull the liner away from the receiver, just twist it. Now tighten the 15mm nut, screw the shroud back on, and shoot another 3 shot group using the same point of aim. You should see a change in point of impact. Then unscrew the shroud, pull it back again, unloosen the 15mm brass nut again, twist the liner another quarter turn in the same direction. Retighten 15mm nut, rescrew on shroud and shoot another 3 shot group. You should be able to see your groups start looking like the face on a clock and be able to tell which way you need to twist your liner so that it is having the highest point of impact.

Best of luck, Phil
 
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What Ghostranger said.

Also, if your barrel is tossing pellets to the left or right, that means you will be able to zero your scope for windage at say, 50 yards, but still be off to the left or right at 100 yards or 25 yards or whatever. I had a gun that did that once, drove me nuts, never figured out the problem until after I sold it and then kicked myself in the pants.
 
Upvote 0
Jason,

The goal is to find your near max velocity. That will usually correspond to a higher regulator pressure. On the MK2(newest version), start about 140 bar and go up from there. On the MK1(older version of Crown) start about 120 bar. But if yours is already set a little higher than that, just start from where it is.

Note: A higher reg pressure will decrease the amount of shots you get per fill, but the capabilities that you have to shoot higher fps, heavier pellets/slugs, longer ranges, etc... wil increase. This tune will allow you to have the capability to shoot the most sizes(weights) of ammo to the (safe)limits of the gun AND you will have the power to use the 380mm barrel. This tune corresponds to Steve Scialli's(AEAC) "power tune". You can always dial back on the hammer spring(power wheel) and/or transfer port(low, med, high on MK2; or low, 177./.22, .25/.30on the MK1)settings to shoot as "light" or slow as you want too. If later on find yourself always shooting on lower settings(only shooting light ammo at slower speeds), and you don't want the capability of shooting heavier ammo fast/use the 380mm barrel; then you can always remove the stock, decrease the pre-tension screw and lower the reg pressure to get more shots per fill.

The key is to bring them up or down TOGETHER, so they aren't "fighting" each other. 

Indexing the barrel basically means rotating it.

Procedure: Set up a big clean target with a dot in the center to aim at about 25 yards. Fire a 3 shot group at the center dot. Unscrew and pull back the shroud to reveal the brass 15mm nut which holds the liner in place against the receiver. Use a 15mm wrench to loosen the brass nut that binds the liner to the receiver until you can twist the liner by hand. Twist it 1 quarter turn and tighten it back down(it may help to use a marker to make a line on the liner so yoy can tell how far you've rotated it. Make sure not to pull the liner away from the receiver, just twist it. Now tighten the 15mm nut, screw the shroud back on, and shoot another 3 shot group using the same point of aim. You should see a change in point of impact. Then unscrew the shroud, pull it back again, unloosen the 15mm brass nut again, twist the liner another quarter turn in the same direction. Retighten 15mm nut, rescrew on shroud and shoot another 3 shot group. You should be able to see your groups start looking like the face on a clock and be able to tell which way you need to twist your liner so that it is having the highest point of impact.

Best of luck, Phil
Click to expand...

Phil, if one (me) were to have no interest in using my 380mm barrel, and only wanted optimum efficiency and accuracy out of the 700mm barrel, where would you suggest one start for reg pressure?

Any thoughts on Ted Biers having his 30 cal Impact set up at a paltry 90 bar?



Thanks again,

Cliff
 
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Cliff,

I believe Ted's Impact is a good bit more powerful than a Crown MK1. I have tried lower reg pressures(below 105 bar) with my MK1(in .22) combined with a lower HS tension and just not been able to get enough speed with a JSB 18g out of a 700mm STX or slug A liner. 

I used to have a really good tune for shooting JSB 18g at 870fps through a 700mm slug A liner with reg set at 120bar which yielded excellent 100 yard accuracy(in calm conditions) and over 120 shots/per fill. I think a JSB .25 King out of a 700mm STX liner should be analogous, so maybe try around there?

Your 50 yard groups look like they've tighten up nicely! Keep fine tuning.

Regards, Phil






 
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