So I have a new chrono - now what.

Jump to latest Follow Reply
scallen2112

scallen2112

Member
Jan 20, 2019
212
64
Georgia, United States
Couldn't afford another gun, but I needed to buy a new toy (I love being single with grown children) so I got a Pro-Chrono DLX. All I have managed to do is get it set up and hook the ap up with an old tablet I found around the house. It seems to be working fine. While setting it up, I discovered that my Gamo Urban shoots the H&N Hornet at 798 to 800 across five shots, and the H&N Hunter Extremes at 744-748 across 5. (I'll have to get a full strings from a full fill later). I have yet to shoot the AF Texan .457 Carbine across it.

So now what? I have it, but only a vague idea about how to really use it. I know I can get an idea about how my non-regulated guns shoot across a fill. And I know that I can use it to see the results of adjusting the hammer spring. I've heard that most diabolo style pellets like it around the mid 800s, so I am assuming I adjust the hammer spring up on the gamo until I either get close to that with the 16 grain Hornets (what I hunt with most) get around that speed or the groups start spreading and then back off a little. Is that about right?

I think I can use it to see how the Texan reacts to different fill pressures. I know that with a full fill (actually 3400 not 3600) my second shot hits about a half inch higher than the first at 50 yards, so I am guessing there is some valve lock at the higher pressure with the 300 grain projectile - though I have my power wheel turned all the way up.

So now I can see the speed of my projectiles. Yay. What are some other ways you use your chronos to fine tune your guns?
 
You can use your new chrony to determine the actual real world BC of your pellets from your own guns at your elevation. Then you can use that info to create some very accurate drop charts. You can determine BC by getting an average of about ten shots at the muzzle and then again at a known distance down range. I will often use two or three distances down range. It is interesting to see how BC changes with distance as the pellet changes speed. Go out as far as you feel comfortable and confidant that you won’t hit your chrony. Once you have the info saved for all the down range distances you can enter that info into a ballistic program and calculate BC. I like to use ChairGun. Not sure if it is still available anywhere. StrelokPro is another good one. Hawke Optics may still have a free one available on their site.

Kenny
 
Upvote 0
You can use your new chrony to determine the actual real world BC of your pellets from your own guns at your elevation. Then you can use that info to create some very accurate drop charts. You can determine BC by getting an average of about ten shots at the muzzle and then again at a known distance down range. I will often use two or three distances down range. It is interesting to see how BC changes with distance as the pellet changes speed. Go out as far as you feel comfortable and confidant that you won’t hit your chrony. Once you have the info saved for all the down range distances you can enter that info into a ballistic program and calculate BC. I like to use ChairGun. Not sure if it is still available anywhere. StrelokPro is another good one. Hawke Optics may still have a free one available on their site.

Kenny
Click to expand...


I think I know, somewhat, what Ballistic Coefficient is, but I would have to study up on exactly how to use it. Good point though. So far I have just moved a target to different ranges, taken several shots directly at the bull, and noted drop or rise, so I have an idea about holdover at different ranges. I haven't been able to get many done though as it's an exhaustive process and my back yard has a 50 yard max for safe shooting.

You can shoot it!🤪 Just like the rest of us. LoL
Click to expand...


LOL - I'm sure I will get around to that one day.

Don't get lost in data and remember to shoot your guns for FUN.
Click to expand...

I shoot them for meat, mostly. But I have fun doing that.
 
Upvote 0
I would recomend mounting on a long board, mine is almost 4 ft in length, have a pelletvtrap on the end to catch the lead. In the middle under artificial lights is the chrono and in front is a tall wood block with sides to guide the barrel to the center and keeps barrel about 4 inches or so above the chrono but below the light diffusers. 

Why do all this? Maintaining a consistant light and distance above the screens will give the most consistant readings!! Many articles written about how different lighting and heights over screen can alter the readouts... And the best reason for the riser block Is to prevent you from shooting your chrony !!!!!
 
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu