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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Having problems with getting consistant velocity
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<blockquote data-quote="steve smith" data-source="post: 21433" data-attributes="member: 110"><p>Hey Darryl</p><p></p><p>Now you've been doing this alot longer than I have so I will take your word for it, that velocity kills accuracy. But, and this is a big but to me. How and why? </p><p></p><p>There are two possible answers that I can think of.</p><p>1. As you reach the velocity potential(ie max pressure) for the case capacity with a particular bullet, the internal pressures are less predictable and inconsistant. More velocity variation and groups open up. Which in my case I don't think I'm that close yet.</p><p></p><p>2. There is something about pushing bullets that fast that causes them to be less stable.</p><p></p><p>My most educated guess which seems to be supported by your last statement(At least 100 to 200 FPS lower then what the case will <strong>support</strong> in most instances.) would be number 1.</p><p></p><p>Now before I worry about the accuracy to much I'm looking at the large variation in speed. 75fps spread is a lot! At least in my book. Does this problem occur more often in such large capacity cases? With other cases (270win, 30-06, 243win, and 222rem) I was able to deep the variation down around 25fps or less.</p><p></p><p>The first thing I've done was to seat the bullets so that there is full contact between the neck and bullet. Will see if that has any effect on velocity variation. If that fixes the problem then I'll start tweeking the load. Quickload says 3950fps will be max but I'm thinking 4000fps might be possible with out blowing primers. I'll probably push it on up just to see how fast it will go but I'm hoping to stay right around 3750-3800fps. </p><p></p><p>Temperature has been unusualy cool for Texas, it's actualy been staying below 80 degrees. Temp during firing session was about 67-72F. The barrel was cleaned and allowed to cool between each five shots.</p><p></p><p>[ 12-20-2001: Message edited by: txhunter ]</p></blockquote><p></p>
[QUOTE="steve smith, post: 21433, member: 110"] Hey Darryl Now you've been doing this alot longer than I have so I will take your word for it, that velocity kills accuracy. But, and this is a big but to me. How and why? There are two possible answers that I can think of. 1. As you reach the velocity potential(ie max pressure) for the case capacity with a particular bullet, the internal pressures are less predictable and inconsistant. More velocity variation and groups open up. Which in my case I don't think I'm that close yet. 2. There is something about pushing bullets that fast that causes them to be less stable. My most educated guess which seems to be supported by your last statement(At least 100 to 200 FPS lower then what the case will [B]support[/B] in most instances.) would be number 1. Now before I worry about the accuracy to much I'm looking at the large variation in speed. 75fps spread is a lot! At least in my book. Does this problem occur more often in such large capacity cases? With other cases (270win, 30-06, 243win, and 222rem) I was able to deep the variation down around 25fps or less. The first thing I've done was to seat the bullets so that there is full contact between the neck and bullet. Will see if that has any effect on velocity variation. If that fixes the problem then I'll start tweeking the load. Quickload says 3950fps will be max but I'm thinking 4000fps might be possible with out blowing primers. I'll probably push it on up just to see how fast it will go but I'm hoping to stay right around 3750-3800fps. Temperature has been unusualy cool for Texas, it's actualy been staying below 80 degrees. Temp during firing session was about 67-72F. The barrel was cleaned and allowed to cool between each five shots. [ 12-20-2001: Message edited by: txhunter ] [/QUOTE]
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Having problems with getting consistant velocity
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