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Ballistic Coefficient Question
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<blockquote data-quote="NZ Longranger" data-source="post: 903025" data-attributes="member: 14"><p>As far as brakes are concerned, we use both permanently attached and removable brakes, depending on the rifle. In our lightweight walkabout hunting rifles, we take our brake off and use a thread protector for stalking in bush country when we will have to fire a quick shot offhand and won't have time to use hearing protection. Then when we get to a lookout where we might fire a long shot and will have time to use hearing protection, we put the brake back on.</p><p>This system works really well on rifles up to the big 7mms, and we mainly use radial brakes as it doesn't matter if they creep round a bit on the shoulder with the continual taking on and off. A good radial will comfortably tame any 7mm, right up to our maximum capacity 7mm FX (338 Lapua max improved), pushing a 180gn Berger at over 3400fps. On the big 30's and larger, we use more efficient at stopping muzzle jump directional and angled port brakes, and they don't suit the taking on and off so much. But generally, these big rifles aren't used for stalking as much, mostly for long range, so there's plenty of time to use hearing protection. We do not shoot the braked guns without it. If you do you will regret it as you get older.</p><p></p><p>There is not as huge a difference between the radial and the directional brakes with the amount of debris blown about in our opinion. All brakes blow dirt and dust around, make no mistake, and the rearward angled ones are worse than most radials at getting crap in your eyes. But the big guns, especially if lightweight like our under 8 lb all up 338 FX, must have them to be shootable.</p><p></p><p>Really, there is no downside to having a brake fitted, as you can always decide not to use it if you don't want to. And on any all round or specialist long range gun I would always fit one to be able to spot my shots better and minimize the chances of a Weatherby eyebrow when shooting prone.</p><p></p><p>Greg</p><p></p><p>ps I'm not doubting the velocity anyone gets with the 215's at all. The point is comparing the velocities at the <strong>same</strong> pressure. Unless you have pressure measuring equipment and are comparing like with like, you can only use published data like Hodgdon where they do list exact pressure. As I said, we do have Oehler pressure testing gear and are able to do accurate and direct comparisons, and our differential will all the bullets in this debate matched Hodgdon's data, which is why I was satisfied it was accurate to use it in my comparisons.</p><p>Emotion always seems to creep into these caliber debates sooner or later, even with the best intentions!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="NZ Longranger, post: 903025, member: 14"] As far as brakes are concerned, we use both permanently attached and removable brakes, depending on the rifle. In our lightweight walkabout hunting rifles, we take our brake off and use a thread protector for stalking in bush country when we will have to fire a quick shot offhand and won't have time to use hearing protection. Then when we get to a lookout where we might fire a long shot and will have time to use hearing protection, we put the brake back on. This system works really well on rifles up to the big 7mms, and we mainly use radial brakes as it doesn't matter if they creep round a bit on the shoulder with the continual taking on and off. A good radial will comfortably tame any 7mm, right up to our maximum capacity 7mm FX (338 Lapua max improved), pushing a 180gn Berger at over 3400fps. On the big 30's and larger, we use more efficient at stopping muzzle jump directional and angled port brakes, and they don't suit the taking on and off so much. But generally, these big rifles aren't used for stalking as much, mostly for long range, so there's plenty of time to use hearing protection. We do not shoot the braked guns without it. If you do you will regret it as you get older. There is not as huge a difference between the radial and the directional brakes with the amount of debris blown about in our opinion. All brakes blow dirt and dust around, make no mistake, and the rearward angled ones are worse than most radials at getting crap in your eyes. But the big guns, especially if lightweight like our under 8 lb all up 338 FX, must have them to be shootable. Really, there is no downside to having a brake fitted, as you can always decide not to use it if you don't want to. And on any all round or specialist long range gun I would always fit one to be able to spot my shots better and minimize the chances of a Weatherby eyebrow when shooting prone. Greg ps I'm not doubting the velocity anyone gets with the 215's at all. The point is comparing the velocities at the [B]same[/B] pressure. Unless you have pressure measuring equipment and are comparing like with like, you can only use published data like Hodgdon where they do list exact pressure. As I said, we do have Oehler pressure testing gear and are able to do accurate and direct comparisons, and our differential will all the bullets in this debate matched Hodgdon's data, which is why I was satisfied it was accurate to use it in my comparisons. Emotion always seems to creep into these caliber debates sooner or later, even with the best intentions!:) [/QUOTE]
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