Chrony beta master

Kelly and Beth

Kelly and Beth

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Rimbey, ab
How may people are using one of these? I bought one and tried it out with my 280 ackley, wife's 7mm-08 and 223. The numbers I was getting are about 200fps less than what I figured it should be judging by what the books have to say about it. So I guess my question is have you used this chrony? And how do you find the fps over your Chrony compared to what the books have to say?
 
In my rifles I am generally 100-150 fps below " claimed" velocities of manufactured ammo. Many factors affect fps in a rifle, the chamber, length of barrel etc. I've just learned to go with the most accurate load, run a few over the chronograph to determine fps then go from there. They can be used for more then just fps of course, deviation for one.

I only develop loads for hunting so if it's accurate and I know the velocity so I can print out a ballistic table I'm good to go.
 
There's a lot of variables that can affect velocity, but I haven't had the best luck with mine. I've shot it 3 or 4 times and it still works for some reason, hopefully the next one puts it out of it's misery so I can upgrade.
 
I've seen some 'optimistic' looking data in some reloading books. I don't know if it's just me, but often while I pay great attention to the powder, charge, bullet info, OAL, etc., I miss noting the length of the barrel the loads were tested in.. It would seem the 30"+ pressure-barrels some labs use can shoot some loads faster than my 18" Bbl carbine?
 
If you are asking if Chrony makes an accurate chronograph, the answer is yes. I have used them for over 15 years now and unless I am getting a wonky reading (i.e. poor light conditions) I have found that their chronographs are pretty much bang on. The difference in FPS between the chronograph and the manuals is based on the differences in rifles and reloading components. A frequent trick from the old days of reloading that is still carried forward today was for powder companies to use really long barrels (26" or greater barrels) to make the loads faster than what could be achieved in a typical hunting rifle setup (20-22" barrels) - this comes from a time when every company was trying convince the shooting world that their load was the fastest which was considered the mark of being a really effective caliber. If you are concerned that your chronograph is off - the best way to confirm your data is to punch it into a ballistic calculator with your projectile. The FPS and ballistic co-efficient should spit out a drop table. You than shoot the drop table and if your come ups are on than you know the chronograph is right. If you are finding that the come ups are off than you know that the data is not correct. So how I do this is to chronograph my load while shooting groups at 100m. I take my FPS avg data and plug it into my ballistic software on my phone and it spits out a correction for 300m. I than apply the correction and shoot the group at 300m. If it is on, I know the chronograph is right. Hope this helps.
 
I've reloaded for 12 years now and never shot over a chrony before, my loads are strickly hunting loads and I'm more thank happy with the results I have had over the years. I recently had a 280 ackley built and wanted to see how fast the bullets were flying trough it. I'm getting really tight groups with 139 gr interbonds over 54.9 gr of imr 4350. All the load data I've came across so far says that load should be around 3000 fps. I shot a 5 shot group and averaged 2873fps (more than enough for me, deer don't care about it). Just curious about the publics opinion about the books data compared to theirs. I know that one thing to take into consideration is the 26" barrel that they used for their data, what I didn't take into consideration is the time they spent trying to outdo the next book that hits the market and that makes complete sense to me lol.
 
While the chrony readout might be different than any book, it's real world data. With all my firearms, I have yet to see where the listed load gives me exactly what the book says. Too many different factors come into play, the weather, temp, humidity, wind, barrel length, altitude ,bullet jump in the chamber, etc. I have had some better than the books, but only rely on what my guns give me.
 
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