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 Post subject: Airhawk breech shim
PostPosted: Sun Apr 27, 2014 7:10 pm 
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Joined: Mon Aug 05, 2013 4:35 pm
Posts: 800
Location: Fredericton, NB
greetings

while i'm waiting for my new main spring Harry sent me(sub PAL), i decided to attempt to shim the breech seal, for material, i made a cut out using an aluminium can, the kind you see on very small pop cans, its thinner then paper, it made the seal protrude just a little bit, just enough you can barely feel it with your fingers, after i was done, i decided to chrony it with jsb exacts 8.44gr ;

at first, it shot 822, 812, 809, 798, 803...as you can see, the fps dropped consistently

took a second test, this time it went; 795, 794, 796, 794, 793, this time its holding steady, but the numbers are in the same range as it was before the shim, except this time, the extreme spread is 3 instead of 8 like last time, its fine if its like that, a more stable fps is better then less IMO

just curious, did anyone chrony their PAL Ruger, i'm curious to see if the numbers are on par


p.s. this rifle has been known to shoot close to 900 fps with a thicker shim

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 Post subject: Re: Airhawk breech shim
PostPosted: Mon Apr 28, 2014 8:06 pm 
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Joined: Mon Aug 05, 2013 4:35 pm
Posts: 800
Location: Fredericton, NB
greetings

forget about posting numbers for a PAL Ruger, i received the sub PAL spring from Harry(thx again bro), and installed it this evening, in fact, i just spent 3 hours on that rifle, took it apart and found a nice little surprise, the PAL spring was broken, explains the crunchiness i got from cocking it, and the low fps i was getting, anyway, proceeded with the swap, put it back together and realized that the scope i wanted to put on is away on repair, so i had to make due with two other scopes that have been defective on other guns, i must say that the new spring makes it a totally different rifle, quite tame it is now

chronied it with jsb exacts(8.44 gr) at ; 408, 389, 395, 406, 401
then exacts RS(7.3 gr); 467, 474, 475, 470, 468

i know there is a break in period for a new gun, wondering if the same applies to just a new spring(this one has less then 50 pellets as per Harry)

at 10 yards right now, its not grouping to my satisfaction, it will only give a one holer once in a while, maybe with the new scope, after the break in(if applicable).....i hope :?


Attachments:
spring.JPG
spring.JPG [ 224.79 KiB | Viewed 341 times ]
target test.JPG
target test.JPG [ 179.8 KiB | Viewed 341 times ]
ruger.JPG
ruger.JPG [ 225.38 KiB | Viewed 341 times ]

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