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April 8, 2009
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I was reading this over at Linebaugh's site ......
"The reason the .45 Colt case bulges is the chambers in NEARLY ALL modern .45 Colt chambered arms are grossly oversize. The case simply has to stretch beyond its elastic limit to reach the support of the chambers of the firearm. The modern .45 Colt case measures .476 diameter at the case head web area. Most modern chambers run from .486 upwards to .490. This means the new case has to expand from .010 to .014 to seal the chamber and be supported by the firearm. It is then reseized and the process repeated till the case fails. And fail it will, and more than likely prematurely due to overworking."
and wondering what the chamber dimensions were on a DW 45 colt
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January 24, 2009
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Interesting.
I wonder why the current chambers would be oversized like that? And I assume that he is only talking about revolvers, not auto's.
April 8, 2009
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because it's been done that way for years I guess . It is possible that current SAAMI specs call for those dimensions ,which may have been developed initially by colt , way back when . WAY BACK ! LOL !
I can see no GOOD reason to make chambers that big anymore, might have had softer brass which would expand moreso in earlier times .
If the throat is larger than the bullet diameter it drops pressure , which might be of interest if you're a manufacturer worried about liability .
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