300rum 1/9 twist.

Discussion in 'Reloading' started by screech, Dec 10, 2007.

  1. screech

    screech Well-Known Member

    Nov 26, 2005
    Hello, Im building a 300rum with a 9 twist and was windering if it is to much twist for the 210gr. class bullet or am I stuck with the heavy smk's?
  2. jmden

    jmden Well-Known Member

    Nov 2, 2003
    10 twist 300RUMs using US869 at near max loads will work fine on 240SMK's out to about 1500, so I'm sure you're fine with a 9 twist for 210's. That's the word from guys who've shot that far anyway. I've only shot to just over 1000 (getting there...) and when did my part measuring/reading canyon winds, the 240's were doing minute of elk. Might talk to Kirby, but that may even stabilize the 265 AT RBBT Wildcat--1/8 might be better for the 265 though. My Sierra bullet chart reccomends 1/10 for the 210's and 1/9 for the 240's. Good luck.

  3. blackco

    blackco Well-Known Member

    Jan 19, 2007
    I'm having a 300RUM built also and it will also have a 1/9 barrel on it. I choose it because I plan on shooting the 200-220gr bullets and after talking to my smith we decided that would be a good twist. Later I was concerned that if I wanted to shoot some lighter bullets (who knows why) that it would be to fast for them. My smith said the 1/9 was a good compramize; it would stabalize? the heavier bullets but not over-spin the lighter pills.

    I haven't got/shot it yet, but "that's what I heard."
  4. jwp475

    jwp475 Well-Known Member

    Feb 4, 2005
    I am going to build a 300 RUM with a 1 in 8 twist inorder to shoot the 265 grain Wildcats...