Thoughts....338 Win Mag w/ 300 gr Bergers?

Discussion in 'Long Range Hunting & Shooting' started by 4ester, Jun 9, 2013.

  1. 4ester

    4ester Well-Known Member

    Mar 30, 2010
    I have a 338 win mag in Remy 700 sitting in the corner that is collecting dust.

    I know these are not speed demons, but what would happen with a 300 grain Berger at like 2400 FPS? I ran the numbers quick, and it looks like the same energy at 1000 as my 300RUM with 210's.

    Anyone try this before? Results?

    Besides have to dial a few more MOA, can anyone think of any issues I may have? Any expansion issues at the low velocities with the 300 Bergers?

    This is being built as a hunting rifle, light enough to pack to 10,000 ft.

    I ordered an HS Precision for it that should be here next week, and will probably do a 20 MOA Rail. I figure if I dont like it, a new tube in 338 Edge would fit nicely.

    ICANHITHIMMAN Well-Known Member

    Jan 31, 2008
    Good question, I know the 338 win mag has been discussed here before. I will admit to it not being on my radar but I like hearing the responses from the more experienced guys.

    My 2 cents are, well you have it so why not. But what are the numbers withe the 250g, may be a better option?
  3. benchracer

    benchracer Well-Known Member

    Dec 18, 2009
    I asked a very similar question when I first joined this site. The answer I was given was that .338WM just will not push heavy bullets fast enough to be useful. The problem is not energy, it is the fact that the bullet is dropping so much as to make it very difficult to hit your target at long range.

    The general consensus was that the .338WM is not really a long range cartridge. One of the very experienced long range shooters/hunters who frequent, LongTimeLongRanger, maintains that the .338WM is at its best as a light rifle shooting either 185g Barnes TTSX's or 225g Cutting Edge bullets. He states that the 185 TTSX's allow for much easier hits out to 700 yards or so and the 225 CE's out to closer to 1000.

    If neither one of those options does it for you, then stepping up to .338RUM would probably be the way to go.

    FEENIX Well-Known Member

    Dec 20, 2008
    I agree! For now, I load 225g on mine.

    I read an article last year but cannot seem to find it, but the gist of it is "the .338 Win Mag does not have enough powder capacity to generate enough velocity to take advantage of the 300g Berger's BC".

    I say go for it and lead the way! lightbulb:Dgun)
  5. 500mag_guy

    500mag_guy Well-Known Member

    Jun 26, 2011
    I am interested in hearing how the 250gr Bergers work out with the 338wm.. A while back i tried to get some feed back on how well this comb. would work with little to no response. I think with the 250gr and 300gr berger pills the only way to use them is to single feed. i don't believe they fit into the box mag.... if someone has the Berger loading bible if they could post the data for the 338 wm with the 250gr pills using irm 4350 ill see if i can get sometime this week to work with it.

    +1 on the 300gr being a little heavy for the 338 wm.
  6. Bravo 4

    Bravo 4 Well-Known Member

    Jul 20, 2007
    Also should check if your rifle will stabilize them. Probably will, I believe most .338 WM have the 1-10 twist required.

    I say go for it.
    Last edited: Jun 9, 2013
  7. AZShooter

    AZShooter Well-Known Member

    Dec 12, 2005
    I built a 14 lb rifle with a LA to shoot the 338 RCM long throated for the 300 gr ,match tactical hybrids. I chose a 1 in 9 1/2 twist 30" barrel. Bullets are lumbering along at a bit above 2500 fps using RL-17.

    Have put hundreds of rounds through this rifle. It is very accurate with moderate recoil. The barrel should last a long time as it only uses 56 gr of powder.

    Shot a coues wt last fall with it at around 275 yd. Bullet didn't open much and deer died a bit slower than it might have with a lighter hunting bullet. No bloodshot meat with a caliber entrance hole and a 1/2" exit hole.

    I'd say it might be fun to give it a try with your 338 win mag.