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300 wby vs 300 win mag
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<blockquote data-quote="Hugnot" data-source="post: 2342223" data-attributes="member: 115658"><p>Thanks all for going thru this stuff. My purpose was to present the somewhat handicapped .300 WM in a better light in comparison with the .300 WBY by showing a extension of COAL would help things out for the .300WM.</p><p></p><p>"The primary effect of loading a cartridge long is that it leaves more internal volume inside the cartridge. This extra internal volume has a well-known effect; for a given powder charge, there will be less pressure and less velocity produced because of the extra empty space. Another way to look at this is you have to use more powder to achieve the same pressure and velocity when the bullet is seated out long. In fact, the extra powder you can add to a cartridge with the bullet seated long will allow you to achieve greater velocity at the same pressure than a cartridge with a bullet seated short."</p><p></p><p>This is from:</p><p></p><p><u><a href="https://bergerbullets.com/wp-content/uploads/2013/03/COAL.pdf" target="_blank">COAL.pdf (bergerbullets.com)</a></u> not me</p><p></p><p>Some nice photos:</p><p></p><p>[ATTACH=full]312857[/ATTACH]</p><p></p><p>[ATTACH=full]312859[/ATTACH]</p><p></p><p>The H1000 charge difference is 5.5 grains more for the 3.6" .300WM (76.5) than the shorty, capacity challenged 3.34WM (71.0).</p><p></p><p>My calculations came in just under 6 grains using VMD data for Retumbo. Retumbo VMD = .0720, H1000 VMD = .0713, H1000 is somewhat lighter per equal volume & that might account for some of the nearly .5 grain difference (needs more work, like more accurate measurements). In the works is a spread sheet to estimate case volume reduction using bullet displacement. Measuring the minor & major diameters of the boat tail (truncated cone) is not very exact due the radius on the bottom of the boat tail.</p><p></p><p>VMD info:</p><p>[URL unfurl="true"]https://leeprecision.com/files/instruct/VMD.pdf[/URL]</p><p></p><p>Just ask your friendly gun smith to ream the chamber with a longer throat. No other changes - provide a dummy round with the bullet of your choice. Also in the works is a Rem 700, having a 28 ", 10 twist, light Palma barrel, single shot - no magazine COAL restrictions, receiver face squared & lugs lapped in. .</p><p></p><p>Today at the range I got around 2885 - 2914 fps, using 74 gr. IMR 7977 with the old 208 Hornady AMax bullet from the nearly 50 YO, 3.60, .300 WM.</p><p></p><p>Another fyne cartridge, somewhat handicapped but having extensive accessibility, thus excluded from most complaint avenues, is the 2-fo-3 (.243 W). SAAMI standards specify a COAL of 2.710, my .243W is loaded with a COAL of 2.810. It does nicely with the Barnes 95 LR bullet for shooting deers.</p><p></p><p>This thread has been lots of fun!</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2342223, member: 115658"] Thanks all for going thru this stuff. My purpose was to present the somewhat handicapped .300 WM in a better light in comparison with the .300 WBY by showing a extension of COAL would help things out for the .300WM. "The primary effect of loading a cartridge long is that it leaves more internal volume inside the cartridge. This extra internal volume has a well-known effect; for a given powder charge, there will be less pressure and less velocity produced because of the extra empty space. Another way to look at this is you have to use more powder to achieve the same pressure and velocity when the bullet is seated out long. In fact, the extra powder you can add to a cartridge with the bullet seated long will allow you to achieve greater velocity at the same pressure than a cartridge with a bullet seated short." This is from: [U][URL='https://bergerbullets.com/wp-content/uploads/2013/03/COAL.pdf']COAL.pdf (bergerbullets.com)[/URL][/U] not me Some nice photos: [ATTACH type="full" alt="IMG_1602.JPG"]312857[/ATTACH] [ATTACH type="full" alt="IMG_1601.JPG"]312859[/ATTACH] The H1000 charge difference is 5.5 grains more for the 3.6" .300WM (76.5) than the shorty, capacity challenged 3.34WM (71.0). My calculations came in just under 6 grains using VMD data for Retumbo. Retumbo VMD = .0720, H1000 VMD = .0713, H1000 is somewhat lighter per equal volume & that might account for some of the nearly .5 grain difference (needs more work, like more accurate measurements). In the works is a spread sheet to estimate case volume reduction using bullet displacement. Measuring the minor & major diameters of the boat tail (truncated cone) is not very exact due the radius on the bottom of the boat tail. VMD info: [URL unfurl="true"]https://leeprecision.com/files/instruct/VMD.pdf[/URL] Just ask your friendly gun smith to ream the chamber with a longer throat. No other changes - provide a dummy round with the bullet of your choice. Also in the works is a Rem 700, having a 28 ", 10 twist, light Palma barrel, single shot - no magazine COAL restrictions, receiver face squared & lugs lapped in. . Today at the range I got around 2885 - 2914 fps, using 74 gr. IMR 7977 with the old 208 Hornady AMax bullet from the nearly 50 YO, 3.60, .300 WM. Another fyne cartridge, somewhat handicapped but having extensive accessibility, thus excluded from most complaint avenues, is the 2-fo-3 (.243 W). SAAMI standards specify a COAL of 2.710, my .243W is loaded with a COAL of 2.810. It does nicely with the Barnes 95 LR bullet for shooting deers. This thread has been lots of fun! [/QUOTE]
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