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Rifles, Reloading, Optics, Equipment
Gunsmithing
Ogive vs lead angle
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<blockquote data-quote="MagnumManiac" data-source="post: 1082531" data-attributes="member: 10755"><p>Leade angle is different to throat taper. The throat is either parallel or tapered, the degree of taper may stay the same, but the length of it changes as the diameter is increased/decreased. For instance, a 300WM chamber has a 1º26'37" taper that runs from .315" down to .3095" above bullet diameter, then the leade has a 30º taper to the lands proper, as far as I can measure, anyway.</p><p>If cutting a custom throat, generally, it's only the length of it is what is of concern in regard to the bullet being cut for.</p><p>Nobody can say how many shots it would take to start to erode the throat enough to effect the angles, but tracking my own 1000yrd rifle, every 200 rounds down will have a measurable difference in length, it only minor, but it is measurable.</p><p>I don't worry about the length too much, but what concerns me is when the velocity starts to drop off.</p><p>When it does, I work back up to the previous velocity, pressure signs withsranding, of course, but generally this doesn't pose a problem becasuse the pressure drops when the throat lengthens.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1082531, member: 10755"] Leade angle is different to throat taper. The throat is either parallel or tapered, the degree of taper may stay the same, but the length of it changes as the diameter is increased/decreased. For instance, a 300WM chamber has a 1º26'37" taper that runs from .315" down to .3095" above bullet diameter, then the leade has a 30º taper to the lands proper, as far as I can measure, anyway. If cutting a custom throat, generally, it's only the length of it is what is of concern in regard to the bullet being cut for. Nobody can say how many shots it would take to start to erode the throat enough to effect the angles, but tracking my own 1000yrd rifle, every 200 rounds down will have a measurable difference in length, it only minor, but it is measurable. I don't worry about the length too much, but what concerns me is when the velocity starts to drop off. When it does, I work back up to the previous velocity, pressure signs withsranding, of course, but generally this doesn't pose a problem becasuse the pressure drops when the throat lengthens. Cheers. gun) [/QUOTE]
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Ogive vs lead angle
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