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PostPosted: Thu Aug 30, 2018 5:35 pm 
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Joined: Thu Oct 04, 2012 10:27 am
Posts: 1108
Location: Thunder Bay,On.
Phantom 500(originally)

Nitro Piston installed
sized and polished brass barrel block washers
New detent spring and added a spacer/shim
Front of piston " ringed "....buttons at rear
Sanded high spots from barrel
Piston seal sanded and sized
Deburr entire gun

And 2 days later....

: 1/4 inch groups at 30 feet (Garage indoors) bench
FPS results below...
Standard deviation 2.9...over 31 shots
Extreme spread 7....done over 31 shots
Decent numbers but could be better.....

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Last edited by MyCrosman on Thu Aug 30, 2018 6:53 pm, edited 5 times in total.

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PostPosted: Thu Aug 30, 2018 5:57 pm 
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Location: Bowmanville, Ontario
What's the 2.9 and 7? Inches?

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Fully rebuilt Benjamin .22 classic
Some other junk rifles


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PostPosted: Thu Aug 30, 2018 6:07 pm 
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Carpenter84 wrote:
What's the 2.9 and 7? Inches?


Sorry ....meant to say results for fps....

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PostPosted: Thu Aug 30, 2018 8:55 pm 
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Location: Bowmanville, Ontario
I have no idea how fast mines shooting. I know I can hear a drastic difference in air time between crosman 14 grain and a jsb 25 grain.
Waiting to see if I'm able to use leadslingers chrony. I believe yupyup is first in line, hoping I can get in on that list. See what this Benji is shooting.

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Shawn


Fully rebuilt Benjamin .22 classic
Some other junk rifles


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PostPosted: Fri Aug 31, 2018 4:07 am 
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Location: Thunder Bay,On.
Well sir.....a whole new world of knowledge opens up for you with a chrony....a world presently hidden from your eyes....sounds corny.....but once you try one out....with all the various pellet shapes....sizes...weights and after seeing instant results from your tuning efforts.....you'll never want to be without one again.....you'll be like a kid in a candy store when leadslingers chrony arrives...lol......enjoy.....

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PostPosted: Fri Aug 31, 2018 6:06 am 
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Location: Bowmanville, Ontario
MyCrosman wrote:
Well sir.....a whole new world of knowledge opens up for you with a chrony....a world presently hidden from your eyes....sounds corny.....but once you try one out....with all the various pellet shapes....sizes...weights and after seeing instant results from your tuning efforts.....you'll never want to be without one again.....you'll be like a kid in a candy store when leadslingers chrony arrives...lol......enjoy.....


Good..lord..man... it’s..almost..like..someone..let...captain...Kirk...of...the..star..ship.. Enterprise...into.the..room..who...talks..like.. every..word...is..it’s..own...sentence................. hahahaha.

I know I should just go buy one, but moneys gonna be tight for a bit with the wife coming off work for a 5 week placement. So, maybe in the fall if I can find one.

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Shawn


Fully rebuilt Benjamin .22 classic
Some other junk rifles


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PostPosted: Fri Aug 31, 2018 6:22 am 
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Why.....thank you for comparing me to the Captain...I'm honoured...could be though I'm actually a robot ...primary function....merchandising....have a nice day...

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PostPosted: Fri Aug 31, 2018 7:59 am 
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Location: New Brunswick
I love my Phantom and would like to try improving it.
Exactly what do you mean when you say you installed "sized and polished brass barrel block washers"?


Sent from my iPad using Tapatalk

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PostPosted: Fri Aug 31, 2018 9:20 am 
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Location: Bowmanville, Ontario
The washers between the barrel block and the forks. In cheap rifles they're plastic. This is actually a very critical area. If the fit up is poor or the forks are being torqued in or outwards then there will be wiggle in the barrel destroying accuracy.
I totally rebuilt this area on my Benji .22 and last night I shot 3 sets of 10 in a 1/2" at 18 yards. That us d to be impossible.

I'm actually considering helping guys rebuild this area by offering machining services, or providing spec parts.

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Shawn


Fully rebuilt Benjamin .22 classic
Some other junk rifles


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PostPosted: Fri Aug 31, 2018 9:23 am 
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Carpenter84 wrote:
The washers between the barrel block and the forks. In cheap rifles they're plastic. This is actually a very critical area. If the fit up is poor or the forks are being torqued in or outwards then there will be wiggle in the barrel destroying accuracy.
I totally rebuilt this area on my Benji .22 and last night I shot 3 sets of 10 in a 1/2" at 18 yards. That us d to be impossible.

I'm actually considering helping guys rebuild this area by offering machining services, or providing spec parts.

That's funny....I was just going to suggest to sure shot that he read your posts on the subject.... :D

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PostPosted: Fri Aug 31, 2018 9:47 am 
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SureShot wrote:
I love my Phantom and would like to try improving it.
Exactly what do you mean when you say you installed "sized and polished brass barrel block washers"?


Sent from my iPad using Tapatalk

One thing I like about the Phantom...indeed All Crosmans....is that they're a tinkerer/tuners dream..rough around the edges to say the least...which is what gives you the opportunity to turn them into good shooters....you won't turn one into a Weihrauch or a Beeman R9 or a TX200...but you CAN greatly improve its performance...Sometimes I want to go to Canadian Tire and buy yet another one just to have something to work on...lol

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PostPosted: Fri Aug 31, 2018 11:44 am 
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Location: GTA, ON
Lol ~ you just too boring... I hope I would have that much time on my air guns....

Sent from my LG cellphone

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HW30/35
2240+14" barrel
Camo Chaser long barrel rifle kit
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PostPosted: Fri Aug 31, 2018 11:47 am 
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Location: Somewheres near the Atlantic
I bought Diana 240C thinking it would be better than a crosman. But the crude spring and cheap spring guide, I dunno if there any tuning I can do to make it softer. Unless I build a new spring guide.


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PostPosted: Fri Aug 31, 2018 12:02 pm 
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Location: Bowmanville, Ontario
leadslinger wrote:
......... Unless I build a new spring guide.



Do it!

I have that xisico b3-2 undercock that I figure is pretty much un-tunable too. No idea what to do with it to make it faster.

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Fully rebuilt Benjamin .22 classic
Some other junk rifles


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PostPosted: Fri Aug 31, 2018 12:08 pm 
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Location: Somewheres near the Atlantic
Lets just say the spring guide looks like if you took a tube and took a pair of pliers to it. Pulling the metal into tabs.

Not really that impressed with it. Even Crosmans were better.


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