Barrel length 300WM

Discussion in 'Gunsmithing' started by .222, Jan 23, 2008.

  1. .222

    .222 Well-Known Member

    Apr 1, 2007
    I believe I may be reaching the end of the service life of the barrel of my Sendero 300WM. I am curious where the law of diminishing returns kicks in, in regards to barrel length with this caliber. My factory barrel is 26” and I am curious how much I could gain with a longer tube, and at what point longer becomes too long, from a ballistic point of view.

    Additionally, if anyone has any input on a gunsmith to put it all together in the Houston, TX area.
  2. .222

    .222 Well-Known Member

    Apr 1, 2007

  3. jjmp

    jjmp Well-Known Member

    Dec 4, 2007
    its really your choise, but if your looking for more bullet speed go longer,with a custom barrel you can change length,conture,twist,etc,etc, you can improve your stock by skim bedding the action,better trigger. the skys the limit . can''t tell you about a texas smith but their are some awesome ones here. look at gun photos.:)
  4. Jimm

    Jimm Writers Guild

    Jun 12, 2007
    my smith reccomended

    28" and 11 twist . I took his advice and am glad I did . 190 smks around 3050 to 3080 fps ( two different loads ) and 1/3 moa performance . I had originally wanted to shoot the 220 gr smks so was asking for a 10 twist bbl . He explained that the 300 wm just doesnt have enough " lead in its pencil " ( not enough powder capacity ) to0 push the 220 's fast enough to beat out the 190smks . He was right .

    Jim B.
  5. 338hammer

    338hammer Well-Known Member

    Jan 10, 2008

    About Vais Arms Inc. -

    Ron does super work.

    The 300 is a fine cartridge while using the bullet weight in conjunction with powder capacity. Have a friend using the 190 MK'S at 3200fps from a 300X8Em Mag for 1000 yards.

  6. J E Custom

    J E Custom Well-Known Member

    Jul 29, 2004

    If you went to 30" that would be about the point of diminishing
    returns you were talking about.

    28" would pick up about 75 more ft/sec and 30 about 50ft/sec
    more than the 28" tube but would not be as manageable as the 28"
    in a deer stand.

    Also another way to pick up some velocity is with a hand laped
    custom stainless barrel.

    Living in texas I use a lot of Shillen barrels but cant say enough
    about Lilja barrels. and have gotten extreamly good accuracy
    from both.(less than 1/2 MOA with all rifles using these barrels).

    Good luck on your build
  7. .222

    .222 Well-Known Member

    Apr 1, 2007
    Thank yall for the help. I'm prolly going with the 30" as I do more ridgetop hunting and dont often sit in a stand. Again, thanks.
  8. bagpuss

    bagpuss New Member

    Dec 26, 2007
    my pss tube with one in ten twist liked a vel of 2850 and thats the general rule of these girls with 10 twist

    on rebarreling I got a 32" 32mm thick tube with a short throat based on calculated figures that I would need about 74gr of h1000 in the new tube instead of the 78.2 needed in the 26" tube to get the same vel

    I opted for a short throat because of............I wanted the bullet to sit near ontop of powder giving 98%ish fill and touch the lands

    sent in a case that had been fired but full length sized so they could match a reamer to my die and a bullet together with the math and theory

    get the gun back, loaded 74gr of h1000 (trusting my math and theory)and said good bye to my ass just incase, fired that first round with no work up etc and it right on the very first round

    of course I would never recomend not working up a load but all the calculations had been ironed out with the smith and they were in agreement

    300wm are one of a rare few that are considered dangerous to download

    oh yeh 210 bergers are what I feed her

    the longer barrel means less powder,minimum loads, top speed, less wear, less heat and more rounds