Chronographs??

Yeah, your probably right, no need to know how fast those little things are going....Might as well throw out your powder scale too and just fill the case till it almost reaches the shoulder, should be close enough.
 
michaelsabre said:
You know the speed of the bullets...then what?
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Well, if you shoot long range, you can calculate accurate trajectories. It's very simple to do if you have a good velocity numbers and very accurate with the ballistics calculators available today (JBM). Yet, guys always seem to show up at matches and are nowhere even close to being on the target board even at 200 or 300 yards...
 
peterdobson said:
It's simple,the PVM-21 is more accurate and reliable.
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I am assuming the high technology of the unit is able to overcome the problem of a screen incorrectly triggering on bullet glint...? Which has been a problem with all the units that I am aware of.

It sure looks like it has all the bells and whistles...
 
guntech, yes, that's what they say. This unit is being used for advanced ballistic evaluation in Canada and elsewhere.

To clarify, reliablity meant recording of shots, reliability of unit has to be proven.

Regards,

Peter
 
peterdobson said:
guntech, yes, that's what they say. This unit is being used for advanced ballistic evaluation in Canada and elsewhere.

To clarify, reliablity meant recording of shots, reliability of unit has to be proven.

Regards,

Peter
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Litz indictated in his book, 1st edition that he used a CED M2 for testing. if it worked for him, I am quite satisfied.
 
Obtunded said:
The achilles heel with the "Shooting Chrony" is the hinged base. If that base in not fully extended, or if the diffusers catch wind and flex any, then the sensors tend to point towards each other slightly, and you will get different velocities if you fire low in the chrony versus higher in the chrony.

The CED are as good as you can get. I understand Ohler has not been making their excellent chronograph for some time now.
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I mark the crosshair line with masking tape on the uprights so that I shoot through the same point.
 
I have to agree with Peter regarding the PVM-21. I own one of the Ohler 35 units from the latest run, and have owned a PVM-21 for some time. I use the Ohler if I have a quick set of data to collect, however the infrared 'eyes' and amazing database that ties into Quickload make the PVM-21 my first choice.
 
I used to use a fancy chrony with lots of functions but at the range I can only access the functions at cease fire. So it was still lo-tek pen and paper. Until I shot it down.
Now I got a brand new F1 Chrony for $69.99US south of the border. Works exactly like the old one.
 
kombayotch said:
Well, if you shoot long range, you can calculate accurate trajectories. It's very simple to do if you have a good velocity numbers and very accurate with the ballistics calculators available today (JBM). Yet, guys always seem to show up at matches and are nowhere even close to being on the target board even at 200 or 300 yards...
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Let's say you know the speed. But the BC data you download from internet is as good as "educated guess".

From loading book you can get good enough velocity data anyhow.

Get a 100m sight-in rifle and try 500m with calculated number....good luck!
 
Litz BC models are not "educated guesses" they come from actual tests. Many of us use them with calculated trajectories to make accurate hits at 500m and beyond.

If you're having trouble getting on at 500m with your calculated trajectories, it's most likely because the data you're entering into it isn't accurate. Garbage in give garbage out. Using the velocity and BC data from reloading manuals and the majority of bullet manufacturers definitely qualifies as garbage in... Scope height above the bore is also a critical input.
 
michaelsabre said:
Let's say you know the speed. But the BC data you download from internet is as good as "educated guess".

From loading book you can get good enough velocity data anyhow.

Get a 100m sight-in rifle and try 500m with calculated number....good luck!
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Some combos aren't even in loading manuals and a good number of long range shooters aren't necessarily loading inside the listed max.

"Good enough" isn't good enough in long range precision shooting.
 
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