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bullet drop at 1000 yards, new v fired cases

 
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  #8  
Old 10-09-2010, 11:21 AM
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Re: bullet drop at 1000 yards, new v fired cases

Wow Bravo, we must have hit the submit button at near;y the same time!
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Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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  #9  
Old 10-09-2010, 12:00 PM
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Re: bullet drop at 1000 yards, new v fired cases

So are you saying I'm a little faster on the trigger...

Well that can work both ways. "You can't miss fast enough!"-I think somebody running around here has that on his handle.
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  #10  
Old 10-09-2010, 12:17 PM
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Re: bullet drop at 1000 yards, new v fired cases

i won't argue that a different lot of brass will spit bullets out at a little different speed. but, i will guarantee you that a different volumn of internal case capacity will make absolutely no difference in how fast the bullets will go.
i will also guarantee you a heavier case doesn't necessarily mean a smaller capacity. i've tested this several times and sometimes the heavier cases will hold more powder.
the bottom line is...small differences in case capacity mean nothing as far as pressure and speed go.
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  #11  
Old 10-09-2010, 12:30 PM
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Re: bullet drop at 1000 yards, new v fired cases

So Dave,

If you took a 338 Edge case with a wall thickness so thick that you had the same capacity as a 340 weatherby mag, and stuffed and compressed the same amount of powder in it, the pressure wouldnt go up?

Interesting.

It is a widely known fact that old military cases for the 308 were steel and NOT to use traditional load data. They were also thicker which lessened the case capcity and would cause a dangerous condition when loaded traditionaly.
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Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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  #12  
Old 10-09-2010, 12:52 PM
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Re: bullet drop at 1000 yards, new v fired cases

obviously you can take this to the extreme, but small case volume differences won't make any changes. separate some cases by weight then measure their capacity. you'll find cases that weigh exactly the same, will vary by internal volume and some will surprize you. i know of a hall of fame shooter and other very good shooters that tested this extensively and came to the conclusion it made no difference. i've tested it, although no where near what i would call extensively, and came to the same conclusion.
weighing cases will give you cases that all weigh the same, nothing else!
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  #13  
Old 10-09-2010, 03:04 PM
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Re: bullet drop at 1000 yards, new v fired cases

Ok, in some circumstances you are right. Heavier cases dont always meen less volume. You are 100% correct. So lets assume that when I was refering to heavier cases I was refering to the ones that are thicker.

That said, I have experience the opposite as you. Using top loads in my 338 Edge using one case brand and lot and using the same powder charge with 'thicker' walled cases from a different lot#, I have has sticky bolts and cratered primers along with higher velocities. Going back to the original cases manifested average velocities and no sticky bolt. Granted I dont have a pressure trace but it seems clear to me that there can be differences. Espescially since it happens to other shooters and me with other guns in similar circumstances. Of course like alot of other things, it is relative. If you are not using max loads and the difference can be much less. The closer you get to maximum pressures, the more sensitive things can be problems become compounded due to the 'little things'.

Call it what you want but there are circumstances where thicker cases can and do cause higher pressures.
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Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.

Last edited by Michael Eichele; 10-09-2010 at 03:15 PM.
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  #14  
Old 10-09-2010, 03:28 PM
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Re: bullet drop at 1000 yards, new v fired cases

Michael, i understand what you're saying but i just don't think it's simply a case volume thing.thicker brass can mean a more difficult bullet release. i know, you turn your necks. different brass can have different qualities. a different lot of bullets, the same thing. there are so many variables with this stuff we don't even know them all. i just know small differences in case capacity mean nothing in the bullets MV.
i talked to a very competitive 1k shooter a couple years ago. he sorted his brass by how consistant they shot speed wise. when he checked the internal volume he was shocked to discover how much they varied.
again, i understand what you're saying. i just bet something else was causing your higher pressures, not a small change in case volume.
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