Canadian Airgun Forum

The #1 Community for Airguns in Canada!
It is currently Wed Nov 20, 2019 8:47 pm

All times are UTC - 5 hours


The Canadian Airgun Forums are a place for people to discuss and learn about airguns and the airgunning sport in Canada. There are lots of discussions about airguns, airgun accessories, reviews, modification and repair information, airgun events, field target and free classifieds!

 

You need to register before you can post: click the register link to proceed. Before you register, please read the forum rules. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own pictures, and access many other special features. Registration is fast, simple, and absolutely free! To start viewing messages, select the forum that you want to visit from the selection below.








Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Wed Feb 12, 2014 9:50 pm 
Offline

Joined: Sun Jul 28, 2013 8:34 pm
Posts: 1155
Location: Vernon BC
Hello guys. I was wondering if someone can advise me on some tuning tips for efficiency. I've read plugging the holes on valve helps not waste air. Its a .177 cal and so far groups eun jin 16 gr the best. Next are JSB Kings 13 gr. I tried RWS Superdomes 8.3 gr and H&N FTT 8.64 gr, it shoots them wildy! H&N Barracuda's 10.65 gr pretty good. Overall, this gun shoots the 6 pellets I've tried pretty good I'd say. The 2 lighter ones not as much.

At 21 yards, it put 10 16 gr Eun Jins into a nickel. But groups fall off pretty quickly. Unfortunately, got too dark for a chrony test. So don't know exactly what the guns doing. I do know it's loud. As much as a .22 lr maybe! And groups erratically with 8 gr pellets but nicely with 13-16 gr pellets.

I'm looking to tune it for more shot count and air efficiency and a smoother action. After 20 shots from 200 bar, pressure is down quite a bit compared to the Concept. This gun seems to have a lot of potential. Any advice much appreciated!


Top
 Profile  
 
PostPosted: Thu Feb 13, 2014 7:02 am 
Offline
User avatar

Joined: Sun Jan 09, 2011 8:07 am
Posts: 3320
Location: Central West River Nova Scotia
The problem with lighter pellet,s in the Pneuma is the speed. much too fast for light ammo. However if you tune it down for better accuracy with light ammo, you will lose much needed power for the heavy ammo. So what do you do? there is a mod for adjusting the hammer spring without removing the stock, however I cant find it right now. all that,s needed is a small hole drilled in the bottom of your stock for the small allen key that stops the hammer from turning while you adjust the hammer spring, and a notch under your safety, for the larger allen key to turn the adjusting screw. And a LONG allen key.Then some testing to find how many turn,s in or out for best accuracy/speed. For this a Chrony is required. As for plugging holes in the valve, personally I have not tried this as I'm happy with the hammer spring adjustment.

_________________
If I had only one wish, it would be to be able to "unsay" things.


Top
 Profile  
 
PostPosted: Thu Feb 13, 2014 12:01 pm 
Offline

Joined: Sun Jul 28, 2013 8:34 pm
Posts: 1155
Location: Vernon BC
Thanks Joe! Whats your pneuma .177 shooting best? Have you adjusted your spring? The pneuma seems very powerful. Especially in .177. I'd like to tune it for shot count and consistency. If possible, I'd love to try to get 20 shots (2 full clips) of a good extreme spread. With my Brocock, I can get 3 full clips (18 shots) of a spread less than 15 fps which I like. I'll do a chrony run today to see how the numbers are.


Top
 Profile  
 
PostPosted: Thu Feb 13, 2014 12:25 pm 
Offline
User avatar

Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
Hammer adjusting, beginning of this thread.... topic48843.html

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
PostPosted: Thu Feb 13, 2014 8:26 pm 
Offline
User avatar

Joined: Sun Jan 09, 2011 8:07 am
Posts: 3320
Location: Central West River Nova Scotia
I have mine set for 930 fps with jsb 8.4 gr. I just got some 7.3 gr and they travel at 1000 fps, but still damn accurate. Cant remember how many turn,s out for the hammer spring. I get 30 to 40 good shots from 2700 psi down to 1200 psi. I havn, t counted my shots or even shot the Pneuma in a while, so my number,s might not be accurate.

_________________
If I had only one wish, it would be to be able to "unsay" things.


Top
 Profile  
 
PostPosted: Thu Feb 13, 2014 9:09 pm 
Offline

Joined: Sun Jul 28, 2013 8:34 pm
Posts: 1155
Location: Vernon BC
I ran 3 pellets over the chrony that grouped pretty decent. The JSB 13.4 gr string seems the most calm. I will definitely tune it down a bit as it pushes 10 gr pellets above 1000 fps. Shot count is pretty low for usable shots and the tank is depleted to 150 bar from 200. takes about 10-15 more pumps per refill more depending on pellet compared to the Concept for what seems to be less shots :? . So I definitely want to tune it down some. I'm hoping for 20 consistent shots with what ever pellet shoots well.

Eun Jin 16 gr (17 shot string due to errors)
High- 875 FPS
Low- 823.8 FPS
Average- 847.47 FPS/ 25.52 FPE
Extreme Spread- 51 FPS

JSB Exact Heavy 10.34 gr (19 shots due to error)
High- 1034 FPS
Low- 970.1 FPS
Average- 988.61 FPS/ 22.45 FPE
Extreme Spread- 63.9 FPS

JSB Monster 13.4 gr (Only 16 shots because of error)
High-922.7 FPS
Low- 891.7 FPS
Average- 906.89 FPS/ 24.48 FPE
Extreme Spread- 31 FPS


Top
 Profile  
 
PostPosted: Thu Feb 13, 2014 9:42 pm 
Offline

Joined: Tue Jan 29, 2013 6:54 pm
Posts: 2411
Location: Northeastern Ontario
You will probably find that accuracy will be enhanced with pellet velocities closer to 900 fps (or perhaps even a little less) rather than 1000 fps. Pellets become inherently unstable as they approach the speed of sound. It was for this reason -- and to increase shot count -- that I reduced the power on my .177 PCP that was shooting JSB 10.34 gr pellets around 1000 fps.


Top
 Profile  
 
PostPosted: Sat Feb 15, 2014 8:16 am 
Offline

Joined: Fri Dec 21, 2012 3:34 pm
Posts: 17
Tune it down to shoot pellets in the 10 gr range at around 900-950 fps.
And try an air stripper. These guns looove them! They also benefit from a smaller transfer port to not waste air as the factory port is a little on the large side and consumes too much air per shot. The altaros reg for these is a dream as well! The only real way to get true shot to shot consistency.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group

phpBB SEO