2 Tuned spring guns will only put 5.54 H&N FTT hole in hole

One is a HW .22 & I just found out it was tuned for 5.53's. 
Other is a San Raphael R1. Now if it likes 5.53's great. 


Weird thing is 5.52 JSB 18.13's hit way higher in line with the 5.54 zero. Guess they're too tight. Hopefully 5.53 is magic in R1 also.

Here's something I have might help others. Good luck finding many of them though.

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I love my R1. With 5.54 14.66 I can keep them under a nickel at 40 yards refined iron sights. 
Now that I know the HW wants 5.53's it's gonna get a front globe insert with laser cut inverted V & Williams micro click rear notch sight. Don't like Diopter except for a white target with a colored bullseye. Target size & aperture all matter too much. With a rear notch I can find targets easy. 


Best iron sights I have tried are my own refined ones on RWS 48. Make a very fine V notch in front blade. Depth depends on your tune, your near & far zero, pellet weight.

I use the top middle of fat sight at 10-40 knowing my trajectory. To really reach out from 40-75 set target in bottom of V notch level with rear.

I made a Hail Mary 70 yard shot with get this, CPHP's from a 48 the other day. Daughter was with me and I said watch this. He made a mistake. Right in the top of Starlings head. Lucky shot but sparked her interest & she thinks I can do that all the time now
I love my springers but I do wish airguns would be more specific like SAAMI specs. We don't need a trued chamber, action, Lugs, once fired pressure fit trimmed brass & meticulous hand loads. 
Can't we all just agree on head size, barrel bore, L&G's? Nope we can't. 
But we can hope & ask.



 
I have a weihrauch .22 that loves the predator gto. I spent a $150 on pellets a least to find out. Some of them pellets had a 2-3 inch spread at 10 yards. Maybe I’ll get a Diana so I can use up them pellets.

I have ONE HW30 that shoots any .177.

It was John Thomas's personal gun and he can choke barrels. So that's probably why it can. In fact I use 4.49's in it.

Yes most Diana's shoot anything. Newest T06 barrels love JSB's best. 


I'm really thinking about getting the R1 choked tighter if it won't shoot 5.53's. And if I knew how to get the HW77K front barrel assembly off it could be choked also. Slightly cocked to right. HW quality control issue, nobody else's fault & doesn't matter if scoped but I really prefer iron sights while eyes are good enough. Scopes are like cheating to me. Unless you need them for eyes. 
Even when I use scopes I prefer nothing more than 6x and a super thin reticle. 
Well thank you guys. Keep it going on any subject I or you brought up. I have to mark my ad found & order some 5.53's.

Anyone knows if MKI-III HW77K front assembly comes off let me know. All I see is a expansion roll pin in cocking lever part. That ain't it. Front blade on 8mm Dovetail screws in. Maybe it's pressed on but I really don't want to bugger anything. 
 
My Huntington Beech R1 and Goldfinger Carbine R1 both like 5.53's and 5.54 FTT. Neither will shoot most JSB's worth a darn, except for the 18's, which have tended to group similarly (at 25 yards) to the FTT's - similar to JD's experience. Best group I've gotten yet was actually with the JSB 18's, but I need to shoot some more groups to get a better sample size.
 
The problem I've found is not only the bores are too big, but the chokes also too tight. That's a losing combo all around, you need a "big" pellet to seal the bore and make any power, but then it gets squished too much right before the muzzle. At the least it causes a smear of lead to build up at the choke. 

The best one I've had was an early HW80 MK1. I chopped the barrel back, added my own less restrictive choke, and then recrowned. Shot pretty well after that, even with JSBs. 

I've got a MK2 HW77K that I have to find a fix for now. Chopping the barrel and facing it square in the lathe is tough with all the unbalanced weight flailing around, plus you have to shorten the underlever. 

If I remember right there is a pinched in dovetail I'm the barrel that engages the underlever catch, and a very tight press fit holds it on. I used a press to remove mine. If yours isn't severely crooked, a swift blow with a block of wood and heavy hammer may straighten it up. There is a little wiggle room on the dovetail of the couple I've done. But they are on tight, don't pussyfoot around if you go to do it, really put the pepper on it!
 
I thought of a block of wood but I do not want to mess it up. To have front sight milled to a finer post it would have to be straight. Taking the top ramp off and having new Dovetails cut in for a Globe sight lower in band and alignment with bore & rear maybe the best.

I've been looking for videos of taking one off. Not much out there. 
From what I saw bottom of band roll pin sits in a 1/2 circle. That would either need to be shimmed or relieved if it is what locks in alignment. 




Update:,It is a Dovetail on the bottom and it has no play whatsoever so I'm glad I looked real close before trying anything.
The only option is to have a Dovetail for globe insert cut in lower on band trued to bore & back sight or knocked off and true that Dovetail and have a custom piece made. 
I'll show a picture but be aware I am thrilled with the seller. I knew this was a QC issue & most people wouldn't notice unless they used the irons or a laser/instrumentation. I'm not anything but GRATEFUL and just seeking information on perfecting a mass produced QC issue.
John Thomas probably noticed right away but being owner has a $800 Vortek on it who cares about correcting a front sight band off 1-2* so it's not like it wasn't disclosed. In fact seller is who saved me a lot of BS & let me know right away that he'd send 5.53 14.66's until I got some. That's what it was tuned explicitly for & does best with. I was getting hole in hole at 40 yards with 5.54's; but oddly JSB 18.13's hit way higher at 40. Think on that. Less friction from 5.51-5.52? Too heavy causing me to lift? Doubt that. My hold is solid straight back no torque & perfect follow through. I know Thomas tuned magnum guns and while this ain't no 25ft/lb .22 it's going to settle in from a hot 17 to 16-16.5ft/lbs if I know tunes & springers. 
Any of my 7 extra scopes would fix this but I really want to get refined sights and Williams match micro click rear way on back to see if I can outshoot my other refined sights. 


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That band is hard to tell it's not true. Until you add the height of the front blade. 
I then looked at spacing of under lever right before seating in the bottom of front band. Another tell tale sign it's the bands Dovetail cut at bottom that's off. Or barrel was pressed in canted. 
77's and 97's unfortunately don't have the HW nut at breech for barrel. 
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Top sight too far right, and latch wear in shows It's to the left of radius's zenith. Conclusion is crooked band due to barrel being pressed in out of alignment. Not really that Dovetail is off. 
I think the simplest fix is new Dovetail cut in when I get HW, FWB, Anschutz front globe insert & William's rear notch micro click.
Do ya think HW knows?



 
You could also just remove the latch, file off the dovetails, drill and tap throught the top for set screws, and press it back on straight. That way it's adjustable for how you like it and it solves the problem of the sights as well as the underlever alignment. 

Mine were so tight that I don't even think the dovetail is necessary anyway. 

If it were mine, that's how id do it. But sounds like you are off and running with a plan as well.