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OCW load development need advice for a newbie

 
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  #8  
Old 08-26-2009, 01:33 PM
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Re: OCW load development need advice for a newbie

update. small update. At the advice of some of the experts I started fresh with some new brass and a clean barrel and this time starting at .02" off the lands instead of being .005" off the lands.

Nothing huge but I did a simple ladder test just to see where my max load would be and go from there.

RL 22, CCI200 208 Amax
T=60deg, Pressure 29.76, Light Rain. 100 yards

55.5gr - 2566fps
56.0gr - 2624fps
56.5gr - 2660fps
57.0gr - 2631fps (chrony error??)
57.5gr - 2668fps
58.0gr - 2661fps
58.5gr - 2705fps
59.0gr - 2743fps starting to see extractor marks but easy bolt lift
59.5gr - 2731fps
60.0gr - 2762fps extractor marks, still easy bolt lift.

picture of target:



Any input would be great. I think this combo has some potential. The group in the red outline are five shots with the charges listed in the according box.

Thanks again. I'm going to pick up some different powders to try too.
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  #9  
Old 08-26-2009, 03:15 PM
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Join Date: Mar 2008
Location: Puyallup, Wa
Posts: 53
Re: OCW load development need advice for a newbie

Now it really looks like you ought to be working at 200-300 yards! All that variation in charge weights and you're still looking at a group that's barely over 1 minute! Seems to me that you've got a great shooter that was meant for reaching out and printing small groups.

Just out of curiosity- why rely on the chronograph to tell you where an accuracy node is? I don't get it. What does bullet speed have to do with where the different charge weights land on the target, especially so close like at 100 yards? Don't get me wrong, I understand that a large ES will open up a group like you wouldn't believe. However this would come in handy when an accuracy load has already been found by using the OCW test.

Seems to me that if we're worried about speed and horsepower of a cartridge effecting it's performance on targets and animals, we're probably shooting the wrong caliber to start with.

In the early stages of an OCW test, what does bullet speed tell us?

EH
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  #10  
Old 08-26-2009, 04:11 PM
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Posts: 848
Re: OCW load development need advice for a newbie

Looks like 57gr and 59gr both have potential as the shots around them are pretty close.
You can do an ocw with 56.5,57,57.5 and one with 58.5,59,59.5 and see what you get.
I'd try the higher one,59gr, first as it has the best velocity.
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  #11  
Old 08-26-2009, 07:30 PM
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Re: OCW load development need advice for a newbie

I needed to add to the post and I forgot to. but I started having some flattened primers at 58 grains. But the bolt was still easy to open. I've heard that flattened primers are unreliable as pressure signs..at about 59gr I started to see shiny marks on the back of the base of the case head from the extractor. Bolt still easy to open. IS it still safe to keep working those loads up?

I've spoken to some other folks working up these same loads and he's gone up as high as 61gr without pressure signs but, that's his rifle.
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  #12  
Old 08-26-2009, 07:39 PM
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Location: clearfield county , Pa
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Re: OCW load development need advice for a newbie

Quote:
Originally Posted by Frogman77 View Post
I needed to add to the post and I forgot to. but I started having some flattened primers at 58 grains. But the bolt was still easy to open. I've heard that flattened primers are unreliable as pressure signs..at about 59gr I started to see shiny marks on the back of the base of the case head from the extractor. Bolt still easy to open. IS it still safe to keep working those loads up?

I've spoken to some other folks working up these same loads and he's gone up as high as 61gr without pressure signs but, that's his rifle.


if you are marking the brass case head that's when I stop , and back off a little . or switch powders , and start again . Jim
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  #13  
Old 08-26-2009, 07:49 PM
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Posts: 848
Re: OCW load development need advice for a newbie

Sorry, I didn't notice the ejector marks at 59gr.
Work around the 57gr load first and see what you get. You have plenty of velocity, lower pressure and a margin a safety.
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  #14  
Old 08-26-2009, 09:13 PM
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Join Date: May 2008
Location: Ohio
Posts: 248
Re: OCW load development need advice for a newbie

I think there's some misconception that OCW is the key to making your rifle as accurate as possible. THere is nothing further from the truth. Only you can make your rifle shoot its potential. I agree there's lots of science behind it, and with ballistics software it helps a ton, but brush away the wool from your face and shoot and practice, there is a lot of art to it too! (just an alternate way of looking at things)..
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