December 15, 2009, 04:34 PM | #1 |
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284 Colton Magnum
I have just purchased a rifle in this old wildcat and am hoping that someone has some info about it. It is a 338 Win Mag necked to 7mm with the shoulder widened to increase case volume.
Any info on ballistics, reloading data, or the development of the cartridge will be appreciated Thanks |
December 15, 2009, 08:26 PM | #2 |
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Join Date: April 20, 2009
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If it's a 2.5" Mag case, then I'd start with the 7mmRM data as it is pretty conservative. My first 7mm was a Weatherby, which is tapered very little in the body and has a longer neck. With 4831, I'd reach max about 4 grains after the 7mmRM with identical bullets, mainly because of the 3/4" freebore that was employed in the MarkV rifle. I've had sucess with 154-162gr bullets in the 7mmRM using IMR 7828. If you have a standard throat, I'd start with 63gr of IMR7828 under CCI250s with 154 Hornady's and see what you get. Hornady 7 says 65 is max.
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