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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
HELP!! 300 Win Mag Ammo
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<blockquote data-quote="Bart B" data-source="post: 685489" data-attributes="member: 5302"><p>After seeing a lot of folks shooting .300 Win Mag's in 1:12 twist barrels for 190's and 200's in long range matches and doing very well accuracy wise, a 1:10 may well be too fast. Note that virtually all modern 30 caliber magnums are steroided children of the .30-06 wildcats and original magnums based on 1:10 twists and most folks think that's what they need. The first 30 caliber magnums shot a given bullet weight out only about 100 fps faster than a .30-06. And they were mostly used with heavier bullets so their 1:10 twist worked well. I had a .300 Win. Mag. made from a shot out 30 inch .308 Win. barrel with a 1:13 inch twist that shot Sierra 180 HPMK's and SBT's well inside 2 inches at 300 yards.</p><p></p><p>If the bullet weights you listed are what you asked Hart about, I'm surprised they suggested a 1:10 twist When it's well known among other high-end barrel makers that 200's do great from a 1:12 twist in 30 caliber magnums and those around 170 grains you listed would be much better off with a 1:12. Spinning bullets too fast tends to make the more unbalanced ones jump too far off the muzzle axis when they leave. And the centrifugal force on their jackets sometimes causes those with very deep rifling grooves to break apart.</p></blockquote><p>[/QUOTE]</p>
[QUOTE="Bart B, post: 685489, member: 5302"] After seeing a lot of folks shooting .300 Win Mag's in 1:12 twist barrels for 190's and 200's in long range matches and doing very well accuracy wise, a 1:10 may well be too fast. Note that virtually all modern 30 caliber magnums are steroided children of the .30-06 wildcats and original magnums based on 1:10 twists and most folks think that's what they need. The first 30 caliber magnums shot a given bullet weight out only about 100 fps faster than a .30-06. And they were mostly used with heavier bullets so their 1:10 twist worked well. I had a .300 Win. Mag. made from a shot out 30 inch .308 Win. barrel with a 1:13 inch twist that shot Sierra 180 HPMK's and SBT's well inside 2 inches at 300 yards. If the bullet weights you listed are what you asked Hart about, I'm surprised they suggested a 1:10 twist When it's well known among other high-end barrel makers that 200's do great from a 1:12 twist in 30 caliber magnums and those around 170 grains you listed would be much better off with a 1:12. Spinning bullets too fast tends to make the more unbalanced ones jump too far off the muzzle axis when they leave. And the centrifugal force on their jackets sometimes causes those with very deep rifling grooves to break apart.[/QUOTE] [/QUOTE]
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HELP!! 300 Win Mag Ammo
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