Canadian Airgun Forum

The #1 Community for Airguns in Canada!
It is currently Sun Sep 22, 2019 12:34 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  [ 7 posts ] 
Author Message
PostPosted: Wed Sep 04, 2019 12:49 pm 
Offline

Joined: Thu Feb 22, 2018 8:00 pm
Posts: 18
Hi everyone, I recently bought a benjamin classic .22 495 fps from a friend who was moving away and having shot it a little bit I want to do some work to improve it. My first issue is velocity. I have my PAL so no issues with upgrading there. My question is which spring I should order for it and whether the piston also should be swapped out? The piston is about 6in long and the barrel comes back to about a 35-40 degree angle when cocking so I dont think it has a long piston? The spring is only 9.5 in long and had very little preload at all. I added a 1/2in shim behing the spring and lubed everything which quieted the gun down and added some velocity but I would like to get it around 600-700 fps if I can.


Top
 Profile  
 
PostPosted: Wed Sep 04, 2019 4:13 pm 
Offline
User avatar

Joined: Fri Oct 20, 2017 8:29 pm
Posts: 317
Location: Southern Gulf Islands, Beautiful British Columbia, Canada
I've owned one of these myself -it was the rifle that got me back into the sport and down he road to PCPs.

Haven't any experience with increasing power on this model, but the trigger action can be vastly improved by installing a roller bearing. https://www.youtube.com/watch?v=L7QimswXxsw

Cheers!

Avianmanor

_________________
Air Arms S510 Extra
FX Streamline
Daystate Huntsman Classic
Hatsan BT65
Benjamin Marauder
FX Dreamline
Cometa Orion
Weihrauch HW100S
QB78D HPA 875 FPS
Brocock Concept Super 6
Artemis PP700S-A
Diana Chaser
Snowpeak CP1-M
Artemis PP800
FX Radar Chrony


Top
 Profile  
 
PostPosted: Thu Sep 05, 2019 8:49 am 
Offline
User avatar

Joined: Sat Sep 25, 2010 7:49 pm
Posts: 1244
Location: Southern Ontario
I have one of the original ones with the "stainless" finish. Great rifles except for the usual crappy Crosman trigger. A nice GRT-3 replacement solved that...

_________________
Air and springs and CO, too


Top
 Profile  
 
PostPosted: Thu Sep 05, 2019 3:20 pm 
Offline
User avatar

Joined: Sun Jul 01, 2018 10:37 pm
Posts: 104
Location: Guelph, Ontario
Red Beard Forge wrote:
Hi everyone, I recently bought a benjamin classic .22 495 fps from a friend who was moving away and having shot it a little bit I want to do some work to improve it. My first issue is velocity. I have my PAL so no issues with upgrading there. My question is which spring I should order for it and whether the piston also should be swapped out? The piston is about 6in long and the barrel comes back to about a 35-40 degree angle when cocking so I dont think it has a long piston? The spring is only 9.5 in long and had very little preload at all. I added a 1/2in shim behing the spring and lubed everything which quieted the gun down and added some velocity but I would like to get it around 600-700 fps if I can.
Go for B18-00-4D should get you the velocity you are after. Gravel Agency sell it for around 14 dollars.

通过我的 ALP-AL00 上的 Tapatalk发言


Top
 Profile  
 
PostPosted: Thu Sep 05, 2019 7:11 pm 
Offline

Joined: Thu Feb 22, 2018 8:00 pm
Posts: 18
Thanks for the input everyone, I shot it over a chrony last night and with the 1/2" shim it now shoots an average of 470fps with 14.3gr crosman premier hollow points. And about 520 with 11.9gr rws hobby wad cutters. Both pellets make about 7 ft lbs . I also purchased a bearing to mod the trigger today. I may order a spring soon as well but I am pretty happy with the shooting characteristics I only want to increase velocity to the 600 fps range so I'm wondering if a longer shim might do the trick ... although I may be better off putting in a full power spring and trimming it to detune to the power level I want. I have seen several references in this forum to a springer tuning guide by chevota but cant find it on the forum, Can someone point me in the right direction?


Top
 Profile  
 
PostPosted: Thu Sep 05, 2019 7:40 pm 
Offline

Joined: Mon Aug 26, 2013 12:19 pm
Posts: 94
Location: Alvinston, Ontario
Private Message chevota. Spring listed above will give you 713fps with Crosman HP 14.3g. 663fps with JSB 13.43g. 642 with JSB 14.35g. 642 with JSB 15.89g.
That's what I experienced with my Benjamin Classic. Seal was bad, replaced that and spring, shot the 15.89g JSB the best, that's what I choose.
Roller bearing only helped slightly, still a garbage trigger.

Sent from my LG-H873 using Tapatalk


Top
 Profile  
 
PostPosted: Thu Sep 05, 2019 9:12 pm 
Offline

Joined: Sun Feb 10, 2019 7:30 pm
Posts: 3
I have had this rifle for about 8 years and I am getting between 700 and 715 with the piston mod and spring upgrade, I really like it a lot and am now in the process of entering the PCP world. PM me if you like and I can give you the details


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 3 guests


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