Having a bad day with the .300 RUM

Discussion in 'Reloading' started by Guest, Mar 28, 2007.

  1. Guest

    Guest Guest

    Ok I'm trying to work up a .300 RUM and trying to get OAL about .015 off the lands with a 200 Nosler AB. Problem IS when I get to where I want my starting point to be with the bullet my gun turns into a single shot. /ubbthreads/images/graemlins/ooo.gif The cartridge is too long for the magazine. /ubbthreads/images/graemlins/confused.gifI prefer the gun to be a repeater. So big question IS. Just how much shorter than the magazine does the OAL of the .300 RUM have to be to work thru the magazine.I can make it just under or right at but is there a magic number for OAL to be to work thru a Remington LA /ubbthreads/images/graemlins/crazy.gif
    Man when you pull one of those 200 grain Noslers AB's out of the box and look at them you just think MAN thats too long. /ubbthreads/images/graemlins/shocked.gif When you get the bullet seated into the case and about the same length as the magazine the bullet has to be seated way down below the case neck. /ubbthreads/images/graemlins/confused.gif This whole thing is beginning to go way past what I thought was the right way to do things. Just never have worked with that big of a case and bullet before. Factory federals worked fine in the gun but I didn't measure any of them for OAL. /ubbthreads/images/graemlins/blush.gif
  2. 1kstr

    1kstr Well-Known Member

    Dec 20, 2006
    In order to put rounds into the magazine and have it usable as a "repeater" you will have to seat them for length accordingly. I could measure mine for you but I am using 180gr. Accubonds for hunting. I just kept seating them until they worked. Do about 4-5 rounds and see how they shoot. Lived with the group that gave me which was not too bad. Any better ideas out there, other than keeping it a single shot, I would be interested?

  3. jwp475

    jwp475 Well-Known Member

    Feb 4, 2005
    My 300 Rum is on a M-70 action and 3.6" is as long as the magazine will allow loaded rounds to function,I believe that the M-700 Magazine is a little longer and will allow a little longer LOAL My 300Rum with 180 TXS, or 180 and 200 Accubond will shoot in the .4 MOA loaded to fit the magazine. If the throat is cut correctly then your rifle should shoot quite well even if you have to load well short of the lands
  4. Guest

    Guest Guest

    Its a custom built .300 Rum with a Hart barrel. It was shooting .400 with Federal Factory ammo. /ubbthreads/images/graemlins/cool.gif But then I only had one box I shot thru it to varify the accuracy of the guy I had bought it from. He had 80 rounds of federal factory down the tube before I bought it from him. He hadn't shot it with any handloads as he had planned on it being his Elk rifle until he got the hots for long range black powder cartridge rifle matches shortly after he had it and its .25-06AI stable mate built. /ubbthreads/images/graemlins/cool.gif All he really did to either of them was break in the barrels and get them sighted in. /ubbthreads/images/graemlins/crazy.gif
    It sure seems a waste to let all the case capacity be used up by the bullet though and its too bad that there isn't a way to seat that bullet out further without making the rifle a single shot. /ubbthreads/images/graemlins/frown.gif
  5. mrultramag

    mrultramag Well-Known Member

    Jun 9, 2005
    Some of the guys on here speak about a extended mag for the mod 700. I think its called the Wyatt magazine. Takes a smith to put it in also I think. Some one with more knowlege of it will speak up here pretty soon. It may get you where you want to be with your OAL. I just live with mine at 3.670 using the 200 ab. fits the mag and shoots well enough.
  6. britz

    britz Well-Known Member

    Mar 11, 2007
    I am working up a load for my 300WSM in a Tikka T-3. The magazine length is 2.9", the Max ejectable length is 3.036", and for the particular bullet I chose the max length to lands is 3.073". I was angry to say the least! For my first test after barrel break in, was to use Identical rounds except for length. I was delighted to find the best shooter was the one that fit in the mag, and the groups got larger as the OAL increased. Go figure.
  7. 41mag

    41mag Well-Known Member

    Feb 7, 2005

    Tim /Tx has his bullets seated pretty deep so they will fit the magazine, shooting a factory RUM. They generally shoot around 1" or less at 300yds pretty consistantly when he is on top of things. They look a little off, but I will take the groups over the looks any day, and he is getting some pretty decent velocity to boot. He used H-1000 and it works great for his. Might be worth a try.
  8. NYLES

    NYLES Well-Known Member

    Dec 18, 2006

    Thats how I do it on my 300WM and buddy does it on his 7RUM and we both do it on our 7RM's....Only other choice is A diff mag setup or single shot.
  9. Guest

    Guest Guest

    It just seems a bit weird compaird to what I'm used to. /ubbthreads/images/graemlins/crazy.gif
    Normaly I would seat the bullet out to the lands then back it off .015 to .020 but this thing is way beyond that unless I want a single shot. /ubbthreads/images/graemlins/frown.gif
    Then try as I might I couldn't find anything that gave a factory cartridge OAL. Might be I was getting a bit impatiant about that time too. /ubbthreads/images/graemlins/blush.gif Thanks to you guys and your posts though I got a good number to go on and went and tried it and walla. Problem solved. /ubbthreads/images/graemlins/cool.gif
    I was working hard to get things up and running so I could sight it in with the new scope and try out the new crony beta master and see how it works too. /ubbthreads/images/graemlins/cool.gif But with the weather the way its starting to look I doubt that it will happen now. Looks like either rain or snow neither of which I need right now. /ubbthreads/images/graemlins/mad.gif