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ordered new chronograph, now what

 
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  #1  
Old 08-25-2009, 10:48 PM
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Join Date: Apr 2009
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ordered new chronograph, now what

finally ordered a chronograph. i have a load worked up but i finally get to see what is really happening. what is the standard way to set up and what valuable info should i be looking for? any help would be grateful.
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  #2  
Old 08-25-2009, 11:43 PM
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Join Date: Aug 2008
Location: cedar rapids Iowa
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Re: ordered new chronograph, now what

!. Read the instruction book.
2. set up on sturdy tri-pod, 10 to 15 feet from muzzle or follow the directions recommendations.
3. Check and make sure you are shooting through the sensor area and above the sensors. Don't ask how I know this, LOL.
4.Save your readings and compare speeds, es, and SD. These will help you to pick out loads. You compare readings to groups and find the one that meets your requirements, velocity, group size , sd ,es, or all of the above.
The chrono will tell you when you are reaching the point of diminishing returns when you are increasing the powder charge. If an increase in powder only gives you a small increase in velocity you are getting close to that point.

There are many other things that a chrono can tell you about your loads when the readings are compared to the targets. You just have to devise a way to keep track of the groups vs the chrono readings. I use a old Redfield target with a large center diamond and 4 smaller ones, I also have a smaller copy of it that I number the diamonds on as I shoot my groups. It works for me.

Enjoy that new chrono.
Russ
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Old 08-26-2009, 01:45 PM
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Re: ordered new chronograph, now what

Thanks for replying. I have a load worked up just by group size now. Does the fps coralate to the size of my groups? To clear up my question with my grooup size being good, my max veloc for my particular load and gun is reached?
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Old 08-26-2009, 04:26 PM
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Re: ordered new chronograph, now what

Not neccesarily, In my experience the best grouping load is not usually the max velocity load. There are usually two or more vibration nodes for each barrel load combination that group good. Sometimes you can reach the higher velocity node that gives good grouping before exceeding the max load for your rifle. If I can't reach that node without high presure signs I back my load down to the next lower node and live with the velocity. There is not usually that much difference in the velocity. With that being said I will also try different powders and bullets in different combination to get the best accruacy and the highest velocity. This is where a chrono comes in very handy. If a given load of a different powder does not give me a higher velocity than my standard load does there is no reason to pursue that powder bullet combination. In my 7mm Mauser ww760 gives me good accuracy with Berger 168 grain vld bullets at 2550 fps but I get slightly better accuracy with Hornady 160 grain bullets and RL 19 at 2300 fps. The difference is .2 inches avg at 100yds. The avg is over 30 3 shot groups, .3xx avg for the Hornady bullets and . 5xx or below for the Bergers. I shoot the Berger load when hunting because of the velocity difference..
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Old 08-28-2009, 12:11 AM
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Re: ordered new chronograph, now what

So the " Node" is the rifle/ barrel combo sweet spot? Does the node change for different bullet/powder combo for your gun? Would i see a simaliarity in fps for a different bullet type of the same weight? Thanks again for the info.
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  #6  
Old 08-28-2009, 09:34 AM
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Location: cedar rapids Iowa
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Re: ordered new chronograph, now what

Now your getting into internal ballistics where I'm a long way from an expert. Some argue one way and others argue another. Google "rifle barrel harmonics " and you will find a lot of interesting reading. Here is just one to start you out.RSI - Barrel Harmonics

While bullets of the same weight and speed should be comparable there are a lot of other factors that have a lot to do with it. Each barrel is a law unto itself. You just have to find the best combo. How far do you go in your search? How much of your barrel do you shoot out in your search? Only you can answer these questions. If I'm working with a benchrest rifle I would go a lot further looking for the right combo than I will on a hunting rifle.
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  #7  
Old 09-01-2009, 01:25 AM
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Re: ordered new chronograph, now what

Thanks for info ,good article. So what can i see from different powders of different burn rates on a chronograph for the same rifle?
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