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Reloading Techniques For Reloading


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Es?

 
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  #8  
Old 04-07-2012, 08:43 PM
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Location: Crawfordville florida
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Re: Es?

Chrony
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  #9  
Old 04-07-2012, 08:48 PM
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Re: Es?

H4831sc or H1000 with CCI BR2s or Fed210m's works better with 162 hornady's or 168 bergers, I have a H4831sc 210m recipe that runs 3056fps avg with a spread from 9-13fps, depends on conditions.
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  #10  
Old 04-07-2012, 08:58 PM
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Re: Es?

Chrony is not known for consistent accurate readings, hence the cost. I was using one and after the constant error I bought a CED. The same load I was shooting over the chrony would have ES of anywhere from 25-70 fps, the CED typically 8 fps. But for the 7mag, I would switch to a faster powder than retumbo.The fact that you added .5 more and fps dropped could be barrel is not long enuff to burn it all before its out the barrel. RL22, H4831 are good a choice. Just my 2 cents
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  #11  
Old 04-08-2012, 05:39 AM
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Re: Es?

ThE reason I asked about how many shots and how close, is that barrel heat will play a part of your SD, and ES. As the barrel heats, it flexes more, and sometimes gets tighter and will effect speed/ pressure.
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  #12  
Old 04-09-2012, 11:58 AM
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Re: Es?

Fla hunter, you havnt mentioned what caliber this is for. Also you need to work the load up properly if you expect to know why it does a particular thing with a small increase in charge. Retumbo is slow burning and if you don't have a 26" or longer barrel, you are probably getting incomplete powder burn which cause velocity to do funny things and causes unexplained fliers. I suggest starting 4 grains under book max and loading 3 each in .5 gr increments. Shoot these over a chrono at 100 yards in round robin and post the results. This is known as OCW method and has worked well for me. Taking a stab and praying that someone's else's load will work in your gun almost never works.
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  #13  
Old 04-09-2012, 01:20 PM
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Re: Es?

Quote:
Originally Posted by 7stw View Post
ThE reason I asked about how many shots and how close, is that barrel heat will play a part of your SD, and ES. As the barrel heats, it flexes more, and sometimes gets tighter and will effect speed/ pressure.
I'm not sure if I agree with your causality.

Chamber temperature heats the cartridge and cartridge temperature does most certainly affect MV. If you ever let a cartridge sit for long in a hot chamber, that shot will likely print high.

As to the OP... Your sample size is way too small. You need to shoot/record a lot more samples to be statistically significant. If you're happy with group sizes, then keep shooting. If you question the consitency of your chrony, then shoot longer ranges. Groups don't lie.

-- richard
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  #14  
Old 04-09-2012, 05:13 PM
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Re: Es?

I have worked up a load I started with 68.5 n worked on seating depth with 5 shot groups then went all the way to 70.5 @.5each 5 shots and @ 69.5 was the best accuracy ! Went to 1000 yds this weekend n shot 5 under 8 inches I was suprprised n happy ! I just got tbe chony this weekend did not have it for load work up ! If I do my part it will shoot 1/2 moa @ 100 yds
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