Canadian Airgun Forum

The #1 Community for Airguns in Canada!
It is currently Thu Mar 28, 2024 11:37 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  [ 1 post ] 
Author Message
 Post subject: Chairgun and BC
PostPosted: Sat Sep 22, 2018 9:55 am 
Offline

Joined: Thu Sep 01, 2005 12:41 pm
Posts: 151
Location: Montreal
Bottom line, anyone calculated their own BC and how to do it?

Here's the story;

Most pellets are around the 17.5 fpe mark. JSB 15.89 @ 710fps, Hobbies topped at 808, beeman FTS 740, etc.
For some reason FTT 5.55 (10 weight 9.5 grams) were at 710 (+- 5) / 16.5 fpe. Doesnt really matter they shoot great. At my last shooting session, took some time to zero at 25 with 5.55. Retested beeman FTS 5.53 and exact 5.52 for accuracy (had only a handful left of each). To me 5.55 were better despite lower MV. One thing that looked odd was that the beeman FTS were at same height on paper as the 5.55, jsb higher. So i took the chrony to 25yards and ran 3 shots through it. avg for 3 was 665.

If I look at chairgun that would make the 5.55 in my HW80 as having a BC of 0.045 or so. Does this sound right to you? I didnt have any others left by that time but got some more ftt 5.54 and 5.53 i plan to test next time.


Attachments:
IMG_20180922_104133464_HDR.jpg
IMG_20180922_104133464_HDR.jpg [ 432.75 KiB | Viewed 825 times ]
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 12 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