.416 Info needed

Discussion in 'Long Range Hunting & Shooting' started by Earnhardt, May 27, 2013.

  1. Earnhardt

    Earnhardt Well-Known Member

    Aug 25, 2012
    I've built a couple of .416 Weatherby's.
    I've got a few questions for those in the know.
    My .416's have 1 in 12" twist barrels. These guns weigh about 15 lbs.
    When shooting 300-325 grain jacketed bullets above 2800 fps, my groups really start to open up.
    I've read and heard that alot of the guys with 416 Barretts are using 1 in 14" twist barrels for loads at 3100 fps and above.
    Do you think I have too much twist in the barrels at 1 in 12"?

    Another problem is that when I shoot the barrel warm ( meaning 3 shots or more) the jacketed bullet groups open up from .5 MOA/.75 MOA to 1 1/2 MOA.
    Cold bore groups, the gun is very accurate.
    Any amount of heat in the barrel and the groups open up significantly.

    Too much twist in the barrels? Are the 1 in 12" barrels better for the longer, heavier .416 bullets such as Cutting Edge?
    Or is it barrel harmonics/vibrations?
    Any thoughts?
    Last edited: May 27, 2013