Chrono your rifle - Combro Mk 4 cb-625

[Carbonrocket]

I did this vid yesterday about the Combro Mk4.

It shows how to use, mount, program, live firing, results and why we should check the power.

 

Hope you like

 

http://www.youtube.com/watch?v=AlJzRB8gQqw

 

Carb

[airarms]

I did this vid yesterday about the Combro Mk4.

It shows how to use, mount, program, live firing, results and why we should check the power.

 

Hope you like

 

http://www.youtube.com/watch?v=AlJzRB8gQqw

 

Carb

 

 

you can check last three shots on chrono for power etc, by holding down fps or lbs, and it gives you average ,lowest and highest,i think its in that order

[Clubshot]

Most Air Gun Clubs have Chrono's

 

Mostly Table top ones like Skan Pro's

 

Which are often out - for Members & Visitors to keep a eye on their power levels

 

Not forgetting - that a Shop RFD is Legally required to withold a Gun that Exceeds the Sub 12FP Rule

 

And not on a Fire Arms Ticket and pass it onto the Police

 

Clubs - normally ask you to get it sorted before returing to their Ranges

 

BOB/R

[bullet boy]

Well done Carbon. :unsure:

[6669miked]

Hi All

Great run through Carb very handy.

I purchased one of these recently and after a lot of testing wanted to add some of my findings.

 

First off would be that the tin may give the pellet weight but they are never all the same. This will greatly effect your results.

For example I use Air Arms Field Diablos .22 which states on the tin that they are 1,037g but when I weighed them that range from 1.02 to 1,05g (about one in 3 were 1.03g).

 

So my first point is that if you are using a crono you have to weigh each pellet.

Now my scales only has 2 decimal places (first mistake) so each pellet was 1.03grams which is the figure I used to convert to grains (second mistake) as this gives a reasonable error.

1.03 g = 15.895329103gr

1.037g = 16.003355612gr

Which is 0.108027gr difference, at the highest reading of my first session 580m/s = 0.08ft-lbf difference.

My second point is that the Combro only has 1 decimal point when entering the weight in grains so if the pellet is 15.89 do you put in 15.8 or 15.9? Once again there is a reasonable difference.

 

Basically I love my combro but you have to be careful if you are pushing the legal limit as there is a margin for error. If you think you are running at 11.8 you could actually be over the legal limit!

 

At the end of the day stay safe and aim for sub 11.5 ft-lb

 

Cheers Mike