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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Crown
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<blockquote data-quote="ntsqd" data-source="post: 2646117" data-attributes="member: 93138"><p>I prefer the looks of the 11° crown on purpose built target rifles. I even went as far as putting that crown on my 1.5" bore, 75" long spud gun barrel. Mostly because I could. Aoudad has a good point, 11° crowns are easy to clean.</p><p>However, I feel that the more traditional and vintage hunting rifles should have the radius crown that they were born with. An 11°crown would just look wrong on a Win M70 Featherweight or an M64.</p><p></p><p>I think that it would be interesting to learn at what diameter does the escaping gasses stop influencing the bullet. I.E. what is the minimum diameter for the recess of a recessed crown? Similarly, what is the max depth of the recess?</p><p>I would imagine that this is highly muzzle velocity dependent, but within reason it may be that an RoT can be established. </p><p>I would also expect that this at least somewhat dependent on the actual shape of the bullet's base (& not just whether a boat-tail or a flat base).</p><p>Beyond that minimum diameter the barrel can likely have any shape desired and not have any influence on the bullet.</p><p>It very well could be that with some experimentation that an RoT could be developed that says something like: <em>Recess step depth equal to or less than 1/3 bore diameter with the recess step diameter equal to or greater than 2.5X bore diameter.</em></p></blockquote><p></p>
[QUOTE="ntsqd, post: 2646117, member: 93138"] I prefer the looks of the 11° crown on purpose built target rifles. I even went as far as putting that crown on my 1.5" bore, 75" long spud gun barrel. Mostly because I could. Aoudad has a good point, 11° crowns are easy to clean. However, I feel that the more traditional and vintage hunting rifles should have the radius crown that they were born with. An 11°crown would just look wrong on a Win M70 Featherweight or an M64. I think that it would be interesting to learn at what diameter does the escaping gasses stop influencing the bullet. I.E. what is the minimum diameter for the recess of a recessed crown? Similarly, what is the max depth of the recess? I would imagine that this is highly muzzle velocity dependent, but within reason it may be that an RoT can be established. I would also expect that this at least somewhat dependent on the actual shape of the bullet's base (& not just whether a boat-tail or a flat base). Beyond that minimum diameter the barrel can likely have any shape desired and not have any influence on the bullet. It very well could be that with some experimentation that an RoT could be developed that says something like: [I]Recess step depth equal to or less than 1/3 bore diameter with the recess step diameter equal to or greater than 2.5X bore diameter.[/I] [/QUOTE]
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