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.300 Win mag to .300 Ultra mag

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Unread 04-02-2008, 10:20 PM
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Join Date: Jun 2004
Location: Fort Shaw, Montana
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Thanks for clearifying, makes sense and I agree.

Got to love those loading manuals. Ihave seen many that said the 243 and 6mm Rem are the full equal of the 6-284 in velocity!! Like ya said, go figure.

Thanks for taking the time to explain your comments and I agree there is nothing wrong with being conservative!!!

Kirby Allen(50)
Kirby Allen(50)

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Unread 04-04-2008, 12:04 PM
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Join Date: Feb 2008
Posts: 65
I agree with phorwath, I can't see how you would rechamber the existing barrel to RUM, the pilot won't even touch the throat until you were halfway thru the job. Reamers will find their own way which is usually center but given what's acceptable for runout I wouldn't try it.

My personal experience shooting and loading for the 300WM, 300WBY and 300RUM, all in a 26" barrel, is that the 300 Weatherby generally performed as well as the 300RUM with 180gr loads with less powder and kick. I would say if you want something new, try the 300WBY IF your magazine length limitation would support it, many won't and you'll be into more work opening it up.
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