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Fire-forming reduced loads for RUM

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Old 06-09-2009, 01:55 AM
Junior Member
Join Date: Apr 2009
Posts: 9
Fire-forming reduced loads for RUM

I have three 300 RUMs, two 338 RUMS and a 375 RUM. Given they burn at 63K PSI the brass can only be reloaded about 3 times. I'd like a reduced load I can use for fire-forming + plinking. My Speer reloading manual (#10, 1977) has reduced loads using SR 4759 (RUM not invented yet) - and the latest Speer manual (#14) is sold out.

I'd like some reduced loads that won't take away one of the 4 lives of the brass. I know that reduced loads don't guaranteed reduced maximum pressure, but I should be able to find a load that can be used for target shooting + fire-froming + not stress the brass.
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Old 06-09-2009, 09:22 PM
Platinum Member
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,503
Re: Fire-forming reduced loads for RUM

90.0-95.0 grains of H50BMG under 178 AMAX's in the 300 RUM are good accurate mild loads.

If sized properly, you sure can get more than 3 firings from an RUM case.
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

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