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Looking at the average case capacity for a .257 Roberts @ 56gns of water......So I measured a twice fired case with neck resizing only from my .257 Roberts. It measured exactly 59gns, same as the parent 7X57 case. Seems this measurement would make a significant difference when working up a reload.
Any insight on this?
Nosler +P brass.
Last edited by 308ld; 01/19/14.
Ed
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Joined: Nov 2011
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Campfire 'Bwana
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Campfire 'Bwana
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Yes it does. This can be a product of your chamber, or even something as simple as your brand of brass. This increased case capacity is just one more variable to keep in mind as you work up your loads.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Campfire Kahuna
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Campfire Kahuna
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A lot depends on whether or not the measurement is done with the case full to the mouth, or to bullet-seating depth. Bullet-seating depth is normally more accurate for ballistic purposes.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Case full to the mouth. With a case length of 2.223 and a 110AB at 2.873 OAL, the bullet is seated to .54" and a net capacity of 51.9 gn.
Ed
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