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Long Range Hunting & Shooting
.416 Info needed
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<blockquote data-quote="Earnhardt" data-source="post: 811527" data-attributes="member: 53157"><p>I've built a couple of .416 Weatherby's.</p><p>I've got a few questions for those in the know.</p><p>My .416's have 1 in 12" twist barrels. These guns weigh about 15 lbs.</p><p>When shooting 300-325 grain jacketed bullets above 2800 fps, my groups really start to open up.</p><p>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.</p><p>Do you think I have too much twist in the barrels at 1 in 12"?</p><p> </p><p>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.</p><p>Cold bore groups, the gun is very accurate.</p><p>Any amount of heat in the barrel and the groups open up significantly.</p><p> </p><p>Too much twist in the barrels? Are the 1 in 12" barrels better for the longer, heavier .416 bullets such as Cutting Edge?</p><p>Or is it barrel harmonics/vibrations?</p><p>Any thoughts?</p></blockquote><p></p>
[QUOTE="Earnhardt, post: 811527, member: 53157"] 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? [/QUOTE]
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