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biggest of the SA's
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<blockquote data-quote="Guest" data-source="post: 8500"><p><strong>Re: biggest of the SA\'s</strong></p><p></p><p>Let's see if I've got this straight. The Wyatt box allows a .300 WSM to achieve 2900 fps. with a 190 VLD seated out to the box maximum length, right? But with a 140 VLD you can't achieve a similar goal because the bullets are too long?</p><p></p><p> <BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>The Wyatt box gives enough room in the 300 for 190s at 2900 fps (see WyoWhispers thread) but the 140 6.5 bullets are a mile long.</p><p> <HR></BLOCKQUOTE></p><p>If we are given the box length equal to 3.100" and a cartridge OAL of 3.100 with a cartridge capacity of 79.0 grains (approx.) and we take the longest 30 cal. 190 grain bullet of 1.380" (Berger VLD) and seat it to 3.1" that leaves about .380 total length in the case with .190 of that as shank. This leaves 72.499 grains of available capacity. I get about 2900 fps. with several powders in a 24" barrel. This is full capacity at max. pressure.</p><p></p><p>Now, if I take the same case necked down to .264 with a case capacity of 79.0 grains of H2O and pick the longest 140 grain bullet (Berger VLD @ 1.348") and seat it to the same 3.1" OAL then that leaves me with .348" bullet length in the case and .138" of that being shank. Case capacity remaining is 74.855 grains. My calculation come up with about 3125 fps. with several powders at full capacity at max. pressure.</p><p></p><p>How much less of these bullets do you want in the case? I consider 0.190" and 0.138" of shank length to be pretty minimal. So where is the problem with the 140's?</p><p></p><p>Best.</p><p></p><p>[ 12-24-2003: Message edited by: Crispin Goodall ]</p><p></p><p>[ 12-24-2003: Message edited by: Crispin Goodall ]</p></blockquote><p></p>
[QUOTE="Guest, post: 8500"] [b]Re: biggest of the SA\'s[/b] Let's see if I've got this straight. The Wyatt box allows a .300 WSM to achieve 2900 fps. with a 190 VLD seated out to the box maximum length, right? But with a 140 VLD you can't achieve a similar goal because the bullets are too long? <BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>The Wyatt box gives enough room in the 300 for 190s at 2900 fps (see WyoWhispers thread) but the 140 6.5 bullets are a mile long. <HR></BLOCKQUOTE> If we are given the box length equal to 3.100" and a cartridge OAL of 3.100 with a cartridge capacity of 79.0 grains (approx.) and we take the longest 30 cal. 190 grain bullet of 1.380" (Berger VLD) and seat it to 3.1" that leaves about .380 total length in the case with .190 of that as shank. This leaves 72.499 grains of available capacity. I get about 2900 fps. with several powders in a 24" barrel. This is full capacity at max. pressure. Now, if I take the same case necked down to .264 with a case capacity of 79.0 grains of H2O and pick the longest 140 grain bullet (Berger VLD @ 1.348") and seat it to the same 3.1" OAL then that leaves me with .348" bullet length in the case and .138" of that being shank. Case capacity remaining is 74.855 grains. My calculation come up with about 3125 fps. with several powders at full capacity at max. pressure. How much less of these bullets do you want in the case? I consider 0.190" and 0.138" of shank length to be pretty minimal. So where is the problem with the 140's? Best. [ 12-24-2003: Message edited by: Crispin Goodall ] [ 12-24-2003: Message edited by: Crispin Goodall ] [/QUOTE]
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