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September 10, 2001, 06:30 PM | #1 |
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Join Date: February 14, 1999
Location: Pittsburg, CA, USA
Posts: 7,417
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Is there a difference in optimal barrel bore between .45ACP and .45LC?
c title. I'm also aware there may be twist rate issues.
This stems from a possible concern that a Ruger SA in "double-caliber" may not ever achieve optimal accuracy in .45ACP, because I seem to recall that there may be a small difference in peak barrel bore. I know that Ruger is using a 16:1 twist rate on all SA .45cal guns, which seems like it would do OK for most of the loads I'm contemplating. Does anyone know what a peak .45ACP slidegun twist rate is, as done by Wilson/Kimber/etc?
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Jim March |
September 10, 2001, 11:39 PM | #2 |
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Join Date: October 29, 1999
Location: Dewey, AZ
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Lyman uses twist rate in their test guns of 1 in 16" for both the 45ACP and the 45 Colt.
Pre WWII .45 Colt bores were in the neighborhood of .454 while post war guns were/are mostly made with bore diameter of approximately .451. .45ACP nominal bore size is .451. Hence a barrel for .45ACP should be just fine for .45 Colt. Some .45 Colt dies may not size the case down far enough to grip .451-.452 bullets firmly enough. In that case trim the expander plug to not over .450. Sam |
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