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Old 12-27-2016, 12:54 AM
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muddocktor muddocktor is offline
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Range time with my new toy and reloads! Range time with my new toy and reloads! Range time with my new toy and reloads! Range time with my new toy and reloads! Range time with my new toy and reloads!  
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Talking Range time with my new toy and reloads!

Today I got to go to the range with my new toy I got for Christmas, a ProChrono Digital chronograph. I also got the Bluetooth module for it, which makes it real nice to set new strings without having to go downrange and punch the buttons on the face of the chrono. I had a great time and it was so nice to work with a chrono that isn't giving constant errors like the Caldwell I was using before this one.

I brought 2 calibers to play with today; 357 Mag and 44 Mag. And I brought my 629 Classic (6 1/2" barrel) and my 627 Pro (4" barrel) for pistols and my 357 Rossi model 92SRC and my 44 Mag Browning B92 for rifles, which both have 20" barrels on them.

The loads I shot were as follows:

357 Magnum:
All loads used CCi 550 small pistol magnum primers except the PMC Bronze factory ammo I shot 1 string with.
I used 2 different Hi Tek coated MBC bullets, the 140 grain TCFP "Zinger" bullets and the 180 gain RNFP "Striker" bullets. All were crimped in the crimp groove on the bullets with a hard roll crimp.

String 1:
627 Pro
180 grain Striker
13.5 grains H110
Avg velocity - 1014 ft/sec
Max velocity - 1064 ft/sec
Min velocity - 971 ft/sec
Spread - 93 ft/sec
Standard deviation - 31
Muzzle Energy - 376-452 ft/lbs

String 2:
Rossi
180 grain Striker
13.5 grains H110
Avg velocity - 1425 ft/sec
Max velocity - 1460 ft/sec
Min velocity - 1400 ft/sec
Spread - 60 ft/sec
Standard deviation - 19
Muzzle Energy - 783-851 ft/lbs

String 3:
Rossi
180 grain Striker
11.2 grains Accurate #9
Avg velocity - 1480 ft/sec
Max velocity - 1501 ft/sec
Min velocity - 1454 ft/sec
Spread - 47 ft/sec
Standard deviation - 14
Muzzle Energy - 844-900 ft/lbs

String 4:
Rossi
180 grain Striker
13.4 grains IMR 4227
Avg velocity - 1399 ft/sec
Max velocity - 1415 ft/sec
Min velocity - 1378 ft/sec
Spread - 37 ft/sec
Standard deviation - 11
Muzzle Energy - 758-800 ft/lbs

I had some H110 Striker loads left over from last time I did some chrono work that were loaded with a different lot of powder, and this illustrates why you need to check yourself when going from one lot to another with the same powder. These were loaded with 13.0 grains of a different lot of H110 from the powder used in string 2.

String 5
Rossi
180 grain Striker
13.0 grains H110 (different lot of powder)
Avg velocity - 1463 ft/sec
Max velocity - 1503 ft/sec
Min velocity - 1416 ft/sec
Spread - 87 ft/sec
Standard deviation - 22
Muzzle Energy - 801-902 ft/lbs

I then re-ran the new lot H110 loads with the 13.5 grains of powder, just to see how close they repeated string 2.

String 6
Rossi
180 grain Striker
13.5 grains H110 (same as string 1)
Avg velocity - 1441 ft/sec
Max velocity - 1466 ft/sec
Min velocity - 1407 ft/sec
Spread - 59 ft/sec
Standard deviation - 18
Muzzle Energy - 791-858 ft/lbs

Now to the 140 grain Zinger strings

String 1
Rossi
140 grain Zinger
12.5 grains Accurate #9
Avg velocity - 1592 ft/sec
Max velocity - 1654 ft/sec
Min velocity - 1550 ft/sec
Spread - 104 ft/sec
Standard deviation - 27
Muzzle Energy - 746-850 ft/lbs

String 2
Rossi
140 grain Zinger
17.5 grains H110 (old lot)
Avg velocity - 1921 ft/sec
Max velocity - 1940 ft/sec
Min velocity - 1875 ft/sec
Spread - 65 ft/sec
Standard deviation - 18
Muzzle Energy - 1092-1169 ft/lbs

Finally, a string of some PMC Bronze I bought a few years ago when it was so hard to find brass.

Rossi
158 grain JSP
Avg velocity - 1654 ft/sec
Max velocity - 1685 ft/sec
Min velocity - 1594 ft/sec
Spread - 91 ft/sec
Standard deviation - 26
Muzzle Energy - 891-996 ft/lbs

I only ran 3 strings of 44's. I ran a string in the pistol and rifle loaded with some 165 grain JHP bullets that were a production overrun for Cor Bon that I bought from Midway around 3 years ago. I wish Sierra would produce these for reloaders as they are a blast to shoot and give lower recoil than heavier bullets. I haven't shot any kind of critter with them, but I imagine they should blow stuff up as you can get them moving. The third string I ran was out of the rifle with some coated Bayou 240 grain SWC bullets loaded to mid-power with Longshot.

String 1
629 Classic
165 grain JHP
19.0 grains Blue Dot
Avg velocity - 1627 ft/sec
Max velocity - 1664 ft/sec
Min velocity - 1596 ft/sec
Spread - 68 ft/sec
Standard deviation - 26
Muzzle Energy - 933-1014 ft/lbs

String 2
Browning B92
165 grain JHP
19.0 grains Blue Dot
Avg velocity - 2042 ft/sec
Max velocity - 2073 ft/sec
Min velocity - 2011 ft/sec
Spread - 62 ft/sec
Standard deviation - 19
Muzzle Energy - 1481-1574 ft/lbs

String 3
Browning B92
240 grain SWC
11.0 grains Longshot
Avg velocity - 1403 ft/sec
Max velocity - 1421 ft/sec
Min velocity - 1384 ft/sec
Spread - 37 ft/sec
Standard deviation - 13
Muzzle Energy - 1020-1075 ft/lbs

I had a great time playing with my new chrono and figured I would post some data I derived here. I figure it might help someone else out down the road.

None of the loads shown here showed any sign of being overpressured. But, use this data at your own risk and assess your results accordingly. I plan to bump up the A#9/Striker load to around 11.6 grains next to see how that does. I don't know if I will try higher on the striker/H110 loads as that is a max load shown at the Hodgdon Data Center, but with a different bullet. And I definitely will try hotter IMR4227 loads too, as that isn't a max load I shot today either and it showed no sign of pressure.
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Old 12-27-2016, 01:07 AM
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There will be no talking to you for two months until the newness of that wonderful new toy wears off !!

I was out every day that I could with my new chrony.
That data at the table is also so sweet, to have.

Enjoy.
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Old 12-27-2016, 01:21 AM
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Default Thanks to forward Karma.....

Thanks to forward Karma I was gifted a Shooting Chrony by a forum member. I not only feel like I'm on a whole new level, I AM on a whole new level.
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Old 12-27-2016, 01:59 AM
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Yeah, you both got that right. I had a blast playing around with it today. And it really surprised me how hot that Zinger load is with the H110, as that isn't remotely close to a max charge of powder as shown by Hodgdon, with a different bullet of course. But I don't know how much more velocity the Hi Tek coating can take before failure as that load is already over 1900 fps in the rifle. Hodgdon shows a max H110 load of 19.0 grains with a 140 grain XTP bullet.

Next, I guess it will be some 9MM or some of my rifle caliber ammo to check out!
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Old 12-27-2016, 07:02 AM
Forrest r Forrest r is offline
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Talking

Nice!!!
Keep shooting keep recording. It's good you have rifles in the same calibers as you revolvers. Chronographs can tell you many things other than velocities. Rifles tend to have better/harder fp hits with in turn ='s consistent ignition.

You chronograph will pick up on this. So when you test the same loads in the revolver and the rifle you should be getting the same es and sd. If you are not you need to sort it out. Meaning is it a position up 1 shot then position down for the next in the revolvers or are you getting inconsistent ignition/primer hits, etc???

O-ya the chronographs are also good to measure velocities.

Enjoy your new chronograph, not only can you test the velocities of your loads. You can test how position sensitive your loads are, how god the bbl/bullet fit is, no crimp vs crimp or light crimp vs heavy crimp, neck tensions, mechanical issues with ignition of a firearm, best bullet alloy/load combo. Just to name a few. A chronograph is only as good as the person that's using it. And if you ask it the right questions you'll get the right answers.

Put that sucker to work testing everything that you can.

On a side note:
Every rimfire (22lr) that I buy gets tested over a chronograph. I test for consistent ignition. 99% of them need some type of bolt/fp work. A chronograph will tell me this. After the work is done the firearms are re-tested over a chronograph. After they check out ok they are re-tested on paper. Typically there is around a 40% reduction in group size. The 40% reduction ='s shooting 10's and x's with no fliers instead of holding the 9-ring with a 7 or 8 flier in every 10-shot string.

Enjoy your new chronograph
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Old 12-27-2016, 09:45 AM
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I'm jealous! Didn't get a chrono for Christmas.
I really like these chrono reports from forum members. I'll make notes in my load book their results and reference them later should I do a similar load.
Have fun Doc!
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Old 12-31-2016, 03:04 PM
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As a note;

Those metal poles with the nice joint connector don't look too
good if a bullet hits them.

They can be replaced with a wooded dowel from your friendly
hardware store............. and don't forget the extra batteries.

Nothing worse than the unit going on strike, for go go juice
in the middle of a shooting session, or your data goes crazy.
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Old 01-01-2017, 12:43 AM
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...And just to amuse you, i purchased a nice Chrony a few years back to check my work. I used it a couple times and it was eye opening of course. Then I let my buddy shoot over it with his 500S&W and he vaporized it:P. He's a true friend he bought me a new one without me even asking:P. I bought him one for himself the next year. Figured the friendship was worth it.
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Old 01-01-2017, 01:57 AM
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Quote:
Originally Posted by Nevada Ed View Post
As a note;

Those metal poles with the nice joint connector don't look too
good if a bullet hits them.

They can be replaced with a wooded dowel from your friendly
hardware store.............
I had a hard time finding wooden dowels that were the right diameter, but I found some 3/32" fiberglass rod in the Grainger catalog that was just right. It came in 48" lengths which allowed me to make 6 rods 16" long - 4 to use and 2 to keep as spares.
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