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Long Range Hunting & Shooting
Question on CBTO measurement
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<blockquote data-quote="Philward" data-source="post: 2608559" data-attributes="member: 92604"><p>So if the "ramp" is 30°, 45°, or 60° and the different ogive designs there could actually be up to 0.0xx" difference in CBTO to where the bullet actually touches the lands. Is that ramp angle set by SAAMI or the cartridge developer? Rifle manufacturer or gunsmith can change that as they wish? I checked a 30Nos SAAMI drawing I have on hand and it shows 45° for that ramp, followed by 0.110" of 0.3091" then a 1° 30' taper(the leade?) for a distance of ~ 0.1738", then the bore and groove.</p></blockquote><p></p>
[QUOTE="Philward, post: 2608559, member: 92604"] So if the "ramp" is 30°, 45°, or 60° and the different ogive designs there could actually be up to 0.0xx" difference in CBTO to where the bullet actually touches the lands. Is that ramp angle set by SAAMI or the cartridge developer? Rifle manufacturer or gunsmith can change that as they wish? I checked a 30Nos SAAMI drawing I have on hand and it shows 45° for that ramp, followed by 0.110" of 0.3091" then a 1° 30' taper(the leade?) for a distance of ~ 0.1738", then the bore and groove. [/QUOTE]
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Question on CBTO measurement
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