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300 wby vs 300 win mag
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<blockquote data-quote="Hugnot" data-source="post: 2340524" data-attributes="member: 115658"><p>Calculations to determine how much more Retumbo powder could be poured into my 3.6 COAL .300 WM with a 200 H ELDM.</p><p></p><p>Bullet volume 3.6 COAL in case = .16 CC - lower part of boat tail (truncated cone) measured at junction of body & shoulder</p><p>Bullet volume 3.34 COAL in case = .59 CC - volume .230 height, .308 diameter cylinder plus volume of boat tail, measured down from junction of body & shoulder.</p><p></p><p>Difference = .59 - .16 = .43 CC's</p><p></p><p>VMD, Volume 1 grain Retumbo in CC's = .0721 CC's</p><p></p><p>.43 CC's / .0721 = 5.96 grains or so, on my simple powder measure 6.0 grains. 6/78 = would provide another 7.6 % powder capacity over the maximum Retumbo load in the Hodgdon load site.</p><p></p><p>Extending the COAL to 3.6 inches is a sane & efficient way to boost the "efficiency" of the .300 WM to enable it to favorably compare with the .300 WBY. accurate comparisons here</p><p></p><p>Then....</p><p>and ya, we all know that longer freebore/seating depth gains a bit of capacity, a bunch of guys here have done that since this forum was established, I've done that with multiple cases and have never seen more than 2 gr improvement in capacity and little velocity increase, unless you combine that with enlarging the top of case body and pushing the shoulder up for a shorter neck, THEN you will gain 5-10 gr capacity improvement, depending on the taper & neck length of the parent case.</p><p></p><p>anecdotal stuff is funny (not necessarily true or reliable, because based on personal accounts rather than facts or research)</p><p></p><p>Then...</p><p></p><p>[URL unfurl="true"]https://bergerbullets.com/wp-content/uploads/2013/03/COAL.pdf[/URL]</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2340524, member: 115658"] Calculations to determine how much more Retumbo powder could be poured into my 3.6 COAL .300 WM with a 200 H ELDM. Bullet volume 3.6 COAL in case = .16 CC - lower part of boat tail (truncated cone) measured at junction of body & shoulder Bullet volume 3.34 COAL in case = .59 CC - volume .230 height, .308 diameter cylinder plus volume of boat tail, measured down from junction of body & shoulder. Difference = .59 - .16 = .43 CC's VMD, Volume 1 grain Retumbo in CC's = .0721 CC's .43 CC's / .0721 = 5.96 grains or so, on my simple powder measure 6.0 grains. 6/78 = would provide another 7.6 % powder capacity over the maximum Retumbo load in the Hodgdon load site. Extending the COAL to 3.6 inches is a sane & efficient way to boost the "efficiency" of the .300 WM to enable it to favorably compare with the .300 WBY. accurate comparisons here Then.... and ya, we all know that longer freebore/seating depth gains a bit of capacity, a bunch of guys here have done that since this forum was established, I've done that with multiple cases and have never seen more than 2 gr improvement in capacity and little velocity increase, unless you combine that with enlarging the top of case body and pushing the shoulder up for a shorter neck, THEN you will gain 5-10 gr capacity improvement, depending on the taper & neck length of the parent case. anecdotal stuff is funny (not necessarily true or reliable, because based on personal accounts rather than facts or research) Then... [URL unfurl="true"]https://bergerbullets.com/wp-content/uploads/2013/03/COAL.pdf[/URL] [/QUOTE]
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