Does the crown mk2 have different hammer springs/weights for .177 compared to .22 and so on?
Fx crown hammer spring/hammer weight
- Thread starter madeintheuk
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99.9% certain they don't change the hammer weight between the four common calibers . It wouldn't make much sense to have all that adjustability via hammer tension and port size and then require a different hammer in differnet calibers- it would hamstring their .30 cal option if you bought the .177 and vice versa.
In other words, my understanding is that FX built the crown to work well with all 4 calibers without opening up the internals.
In other words, my understanding is that FX built the crown to work well with all 4 calibers without opening up the internals.
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Interesting. Thanks. Reason I asked is I’m tuning my .22 for mrd pellets, and can’t seem to get the speed above 880fps. My hammer is maxed, and my reg is a 120b. 600mm barrel, you would think I could get them faster. If I raise reg pressure, my speed drops. Seems like the hammer just isn’t enough. I’m open to other ideas.
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Ah, now that is a different story. There are many threads here about crown tuning and your situation has come up before.
The mk 2 can run reg pressures as high as 160 bar safely ( not that I do, but nice to know )
When you say your hammer is maxed, are you using the side wheell adjustment or have you adjusted the hammer tension by removing the stock and dialing in more preload via the grub screw?
The mk 2 can run reg pressures as high as 160 bar safely ( not that I do, but nice to know )
When you say your hammer is maxed, are you using the side wheell adjustment or have you adjusted the hammer tension by removing the stock and dialing in more preload via the grub screw?
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Have you tried to slowly lower the reg pressure while shooting over the chrony? It is possible that you are over pressure for the hammer spring. I don't completely trust the gauges that FX uses. Also, do what Oakhonor says and make sure you are really maxed out on your spring.
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Yes. Took srock off and maxed the adjuster to the point the wheel stopped moving, he’s backed it off quarter turn. It’s to the max! Lol
ill try lowering reg pressure and see whats happened. Thanks.
Augie (bigragu) already told me to do this in PM. I should have just listened to him.lol. Someti I just like to put something out here to see if he masses have come across it before.
thanks all!
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Hello MadeintheUK, I am a Brand New FX Ctown Mk II owner. After first weekend of Unbelievable Accuracy demonstrated b6 this rifle with Exact Heavies I had to start experimenting. I have been fiddling with the Dials & Reg Pressure a bit this past week with my Chronograph. My goal was to get .22 MDR‘s to fly at Over 900 and still have the Down Side power to shoot JSB Exact Hvy 18.1 between a range of speeds from 870 - 920.
Results are promising and I hope the incredible Accuracy is Still there when I shoot again at range tomorrow.
SETTINGS I Arrived to: REG.= 135bar / Hammer Spring as Yours Is - Max Possible Tension at #24 on Wheel / TX-Port MAX
MRD’s 25g. at 935 fps at #23 and down to 905 at 18 & 19 on Hammer Dial - MAX Port
FX Hybrid 22g. Slug Speeds SAME as MRD’s - MAX Port
Move to MED. TX PORT - JSB Exact Heavy 18.1s run from a Low of about 830 at #1 Hammer to 880 @ #4 and 900 @ #5… I can keep pushing them up over 1,050 fps Before reaching Top Tension, but Too fast I think. / Not interested in Speed.
Really Hoping the MRD’s fly true and still give me spectacular Tiny Groups with the Exact 18.1’s
This Crown II is like bringing my Reloading Bench to the Range…and it Looks Gorgeous in its Nordic Wolf Suit.. I LOVE IT!
Results are promising and I hope the incredible Accuracy is Still there when I shoot again at range tomorrow.
SETTINGS I Arrived to: REG.= 135bar / Hammer Spring as Yours Is - Max Possible Tension at #24 on Wheel / TX-Port MAX
MRD’s 25g. at 935 fps at #23 and down to 905 at 18 & 19 on Hammer Dial - MAX Port
FX Hybrid 22g. Slug Speeds SAME as MRD’s - MAX Port
Move to MED. TX PORT - JSB Exact Heavy 18.1s run from a Low of about 830 at #1 Hammer to 880 @ #4 and 900 @ #5… I can keep pushing them up over 1,050 fps Before reaching Top Tension, but Too fast I think. / Not interested in Speed.
Really Hoping the MRD’s fly true and still give me spectacular Tiny Groups with the Exact 18.1’s
This Crown II is like bringing my Reloading Bench to the Range…and it Looks Gorgeous in its Nordic Wolf Suit.. I LOVE IT!
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So I did some experimenting with your numbers, and I’m a little bummed to be honest. Firstly, I found my tin of redesigns to be junk. The SD was all over the place, so I tried some 18gn I had, and BINGO. sd was in the 2.1 range.
Next, I raised the reg to 135b from the 120b I had it at. My hammer is still maxed, and the velocity actually dropped. Leading me to beleive I don’t have enough hammer for that reg pressure. I dropped it back to 120b and it’s back at 880fps. Seems as high as it will go. At this same setup, it’s shooting the 18gn pellets at almost 1000fps. No idea of accuracy yet as I’m just trying to get my spreads a little tighter first.
The bummer is, I wanted to set this thing up for slugs (lighter 20.2 or 23gn variety), and without some aftermarket parts I don’t think I can get there. Wondering what the difference between our rifles is. Mine is also brand new 600mm standard superior barrel, transfer port all the way open, I’m stumped!
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I purchased the Crown slug kit for mine, comes with a weight, a modified spring guide and pin probe. I actually used a lighter hammer weight I got from eBay. I am shooting NSA 20.2 in the high 900’s. Feel free to pm me.
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Scotty1 is it accurate. How many different slug types did you play with before your got right one.
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I zeroed in pretty quickly on the 20.2, they work in mags and are light enough to not have to push the gun too hard. I’m using a 500mm barrel so I’m a bit hobbled there. I am not claiming any incredible 1/2 MOA all day long if I do my part nonsense, just that I have decent results so far, and think I’m on a possible good path. I’m using .2175 size, and have not tried .218 yet.
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I’ve had three new mk2 crowns open in the last few months and all three had slightly different configurations to the hammer spring internals from the factory.
Mine was similar to yours and wouldn’t push 23gr slugs beyond about 880fps and started getting a bit of valve lock beyond 120 bar or so. It had the spring and hammer only.
My friends was a little healthier on power output, so checking that one revealed two of those little washers you get in the impact power kit in there as well - inside the hammer and so acting like a little hammer weight.
Another friends gun, bought a month or two later but I think from the same shipment had the washers but one was in the hammer and the other between the spring and guide, adding to spring tension.
I have no idea why there was this variation. Maybe thanks to a couple of unsupervised factory trainees on a Friday afternoon?
I ended up putting ~10gr weights in all of them and they are now excellent with a very wide range of useable reg pressures and power levels.
I recently tried the crown slug power kit tungsten weight and that thing is just ridiculously heavy - I think 26-27gram. With the reg pressure at 140 and hst on absolute minimum the lowest velocity I could achieve was 930fps with 23gr Zan, but with a 30fps. Possibly due the huge amount of free flight with weak spring tension. Power level 2 on the wheel was already 970fps, about the max this reg pressure could achieve with a 600mm and the shot cycle was already feeling and sounding awful, with a nonexistent shot count. Anyway, something to maybe avoid using unless you’re really planning on dialling the crown up to 11.
Mine was similar to yours and wouldn’t push 23gr slugs beyond about 880fps and started getting a bit of valve lock beyond 120 bar or so. It had the spring and hammer only.
My friends was a little healthier on power output, so checking that one revealed two of those little washers you get in the impact power kit in there as well - inside the hammer and so acting like a little hammer weight.
Another friends gun, bought a month or two later but I think from the same shipment had the washers but one was in the hammer and the other between the spring and guide, adding to spring tension.
I have no idea why there was this variation. Maybe thanks to a couple of unsupervised factory trainees on a Friday afternoon?
I ended up putting ~10gr weights in all of them and they are now excellent with a very wide range of useable reg pressures and power levels.
I recently tried the crown slug power kit tungsten weight and that thing is just ridiculously heavy - I think 26-27gram. With the reg pressure at 140 and hst on absolute minimum the lowest velocity I could achieve was 930fps with 23gr Zan, but with a 30fps. Possibly due the huge amount of free flight with weak spring tension. Power level 2 on the wheel was already 970fps, about the max this reg pressure could achieve with a 600mm and the shot cycle was already feeling and sounding awful, with a nonexistent shot count. Anyway, something to maybe avoid using unless you’re really planning on dialling the crown up to 11.
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Where do I find these washers/spacers you speak of? I looked on the fx USA website for some enlightenment, but I see no washers or spacers. Just the hammer, spring, and guide.I’ve had three new mk2 crowns open in the last few months and all three had slightly different configurations to the hammer spring internals from the factory.
Mine was similar to yours and wouldn’t push 23gr slugs beyond about 880fps and started getting a bit of valve lock beyond 120 bar or so. It had the spring and hammer only.
My friends was a little healthier on power output, so checking that one revealed two of those little washers you get in the impact power kit in there as well - inside the hammer and so acting like a little hammer weight.
Another friends gun, bought a month or two later but I think from the same shipment had the washers but one was in the hammer and the other between the spring and guide, adding to spring tension.
I have no idea why there was this variation. Maybe thanks to a couple of unsupervised factory trainees on a Friday afternoon?
I ended up putting ~10gr weights in all of them and they are now excellent with a very wide range of useable reg pressures and power levels.
I recently tried the crown slug power kit tungsten weight and that thing is just ridiculously heavy - I think 26-27gram. With the reg pressure at 140 and hst on absolute minimum the lowest velocity I could achieve was 930fps with 23gr Zan, but with a 30fps. Possibly due the huge amount of free flight with weak spring tension. Power level 2 on the wheel was already 970fps, about the max this reg pressure could achieve with a 600mm and the shot cycle was already feeling and sounding awful, with a nonexistent shot count. Anyway, something to maybe avoid using unless you’re really planning on dialling the crown up to 11.
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No idea where to find them tbh, other than the fact they came included in the original impact slug power kit. I think that kit now just contains the tungsten hammer weight instead.
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Any of you Gentlemen know where there is a new laminate Crown mk2, 500mm, 22cal in stock, that will ship? I cannot find one. Please PM me if you can assist
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Hello Whyzee… Wait ‘til you find one and get you Hands on That Thing!! This dang rifle has got me Obsessed with it in no time flat.
This from someone who is usually Really into the ones that go Boom and use big, sexy Cartridges that I like to make.
Yahoo!!
This from someone who is usually Really into the ones that go Boom and use big, sexy Cartridges that I like to make.
Yahoo!!
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