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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm SAUM Wildcat!
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<blockquote data-quote="calinb" data-source="post: 634393" data-attributes="member: 31242"><p>I was worried that my calculator "calibration" technique, above, resulted in extra powder capacity from an artificially long neck region for the 7mmGT. Here's another approach to "calibrate" the case capacity calculator with the 7 WSM QL case capacity value (80.1 grains) and then changing all but the case head region numbers to reflect the wildcat modifications to the case.</p><p></p><p>As before, I used .131" as the rim length (to reflect the length of the head and extractor groove region). For comparison, a primer is .13" deep. Because the head and extractor groove area doesn't hold much, if any, powder, I subtracted .131" from all the other lengths (including the neck length this time), Finally, instead of using an average groove diameter, as instructed in the directions (whatever "average is for a cylinder and a taper), I adjusted the "rim" diameter to obtain the 80.1 grains result for the 7 WSM case.</p><p></p><p>7WSM:</p><p></p><p>[ATTACH]7958[/ATTACH]</p><p></p><p>It makes the capacity look even a bit worse than before for the 7mmGT:</p><p></p><p>[ATTACH]7959[/ATTACH]</p><p></p><p>If someone could run my 7mmGT numbers (from my post immediately preceding this post) through another tool, like the RCBS tool, it would be most helpful.</p></blockquote><p></p>
[QUOTE="calinb, post: 634393, member: 31242"] I was worried that my calculator "calibration" technique, above, resulted in extra powder capacity from an artificially long neck region for the 7mmGT. Here's another approach to "calibrate" the case capacity calculator with the 7 WSM QL case capacity value (80.1 grains) and then changing all but the case head region numbers to reflect the wildcat modifications to the case. As before, I used .131" as the rim length (to reflect the length of the head and extractor groove region). For comparison, a primer is .13" deep. Because the head and extractor groove area doesn't hold much, if any, powder, I subtracted .131" from all the other lengths (including the neck length this time), Finally, instead of using an average groove diameter, as instructed in the directions (whatever "average is for a cylinder and a taper), I adjusted the "rim" diameter to obtain the 80.1 grains result for the 7 WSM case. 7WSM: [ATTACH]7958.vB[/ATTACH] It makes the capacity look even a bit worse than before for the 7mmGT: [ATTACH]7959.vB[/ATTACH] If someone could run my 7mmGT numbers (from my post immediately preceding this post) through another tool, like the RCBS tool, it would be most helpful. [/QUOTE]
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7mm SAUM Wildcat!
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