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Stubby--Lapua
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<blockquote data-quote="jb1000br" data-source="post: 158645" data-attributes="member: 1459"><p>A thought...actually a result...</p><p></p><p>Subject: 6mmbr/diamondback/broughton 5c</p><p></p><p>Bullets: 106CR(actually 105.5gn), 105(actually 104.9 gn)gn Scenar</p><p>Chrono: 4ft. Oehler 35</p><p></p><p>Same load of 30.8 R15, same seating in relation to the lands, same chrono/bench/light setup <strong>80thou difference in bearing surface</strong></p><p></p><p>5-shot group average velocities and ES figures were the same +-a couple fps.</p><p></p><p>That is about as large a difference I can imagine regarding bearing surface measurements on similar weight bullets, and it didn't matter.</p><p></p><p>That is only a single "data point" but I agree, BS/bore contact area is not near as important as bore diameter in this case...</p><p></p><p>YMMV,</p><p>JB</p></blockquote><p></p>
[QUOTE="jb1000br, post: 158645, member: 1459"] A thought...actually a result... Subject: 6mmbr/diamondback/broughton 5c Bullets: 106CR(actually 105.5gn), 105(actually 104.9 gn)gn Scenar Chrono: 4ft. Oehler 35 Same load of 30.8 R15, same seating in relation to the lands, same chrono/bench/light setup [b]80thou difference in bearing surface[/b] 5-shot group average velocities and ES figures were the same +-a couple fps. That is about as large a difference I can imagine regarding bearing surface measurements on similar weight bullets, and it didn't matter. That is only a single "data point" but I agree, BS/bore contact area is not near as important as bore diameter in this case... YMMV, JB [/QUOTE]
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