338-300 RUM

Discussion in 'Long Range Hunting & Shooting' started by cisco12, Feb 10, 2007.

  1. cisco12

    cisco12 New Member

    Feb 10, 2007
    I am new to this forum even though I have been reading it for some time. I reciently had my custom 300 wby built on a sako long action stolen while on a hunting trip to Quebec. I am considering replacing it with either a weatherby 338-378 accurmark or building one out of a 700 ss sendaro action in the 338-300 RUM. I have considered price of brass and so forth but nowhere have I been able to find any loading data for the 338-300 to see how close it comes to the 338-378 wby. Can anyone supply me with some loads for this caliber which can help me make my decision? Also I would like to know if these cases can be formed from both the 300 RUM and 375 RUM. Using the 300 RUM will result on a thinner case neck where as if 375 RUM brass were necked down to 338 this would result in a thicker walled neck. Any information will be appreciated.
  2. screech

    screech Well-Known Member

    Nov 26, 2005
    I got a 338-378imp. I get about 3-4 loadings a case. with the powder I am using I am getting about 2750-2800 fps with a 300smk. I could go faster with a different kind of powder but I had alot of 50bmg laying around dieing to be burn't up. I would go with a 338am if I was to get another big 338.

  3. Supermag

    Supermag Well-Known Member

    Sep 7, 2006
    I would use the search function for the 338 Edge (a 338/300 RUM). There is a ton of information on this site for that cartridge and the originator of this cartridge (Shawn Carlock) posts on here fairly often.
  4. Shawn Carlock

    Shawn Carlock Sponsor

    Jun 11, 2007
    There is a really good thread in the reloading section on the 338 edge and there is a post in the equipment section that is volumes long with all the info you want and a bunch you probably don't need. If you cannot find them drop me a line and I'll get you all the info I have on loads.