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The Barrel

Talyn

Talyn

SAINT
Founding Member

This excerpt from The Ballistics Handbook discusses barrels, twist rates and how they influence bullet flight from muzzle to target.​

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The Barrel: An Excerpt From The Ballistics Handbook

This excerpt from The Ballistics Handbook discusses barrels, twist rates and how they influence bullet flight from muzzle to target.
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Common Twist Rates for Rifle Calibers:
  • .17 Mach II……………………………… 1:9
  • .17 Hornady Magnum Rimfire…… 1:9
  • .17 Winchester Super Magnum…. 1:9
  • .17 Hornet ………………………………. 1:9
  • .17 Remington…………………………. 1.9
  • .204 Ruger …………………………….. 1:12
  • .22 Long Rifle………………………… 1:16
  • .22 Winchester Magnum Rimfire 1:16
  • .22 Hornet …………………………….. 1:14
  • .222 Remington…………………….. 1:14
  • .223 Remington…… 1:7, 1:8, 1:9, 1:12
  • .223 WSSM……………………………. 1:10
  • .22 ARC…………………………………… 1:7
  • .224 Valkyrie……………………………. 1:7
  • .22-250 Remington…………. 1:12, 1:14
  • .220 Swift……………………… 1:12, 1:14
  • 6mm Remington/.244 Rem. 1:9, 1:12
  • .243 Winchester…………………….. 1:10
  • .243 WSSM……………………………. 1:10
  • .240 Weatherby Magnum ………. 1:9.5
  • 6 Norma BR …………………………….. 1:8
  • 6mm ARC………………………………… 1:7
  • 6mm Creedmoor…………….. 1:7.7, 1:8
  • .25-’06 Remington………………….. 1:10
  • .257 Roberts…………………. 1:9.5, 1:10
  • .250/3000 Savage…………… 1:10, 1:14
  • .25 WSSM……………………………… 1:10
  • .257 Weatherby Magnum………. 1:9.5
  • .260 Remington…………………. 1:8, 1:9
  • 6.5 Grendel……………………………… 1:8
  • 6.5 Creedmoor…………………………. 1:8
  • 6.5×55 Swedish Mauser………….. 1:7.5
  • 6.5-284 Norma…………………… 1:8, 1:9
  • 6.5 PRC……………………………………. 1:8
  • .264 Winchester Magnum…… 1:8, 1:9
  • .26 Nosler……………………………….. 1:8
  • 6.5-300 Weatherby Magnum…….. 1:8
  • .270 Winchester…………………….. 1:10
  • .270 Winchester Short Magnum. 1:10
  • .270 Weatherby Magnum……….. 1:10
  • 6.8 SPC…………………. 1:9.5, 1:11, 1:12
  • 6.8 Western……………………. 1:7.5, 1:8
  • .27 Nosler…………………………….. 1:8.5
  • 7×57 Mauser……………… 1:8, 1:9, 1:10
  • 7-30 Waters…………………………….. 1:9
  • 7mm-08 Remington……………… 1:9.25
  • .280 Remington…………………… 1:9.25
  • 7×64 Brenneke…………………………. 1:9
  • .284 Winchester………………………. 1:9
  • 7mm Winchester Short Magnum 1:9.5
  • 7mm Weatherby Magnum 1:9.25, 1:10
  • .28 Nosler……………………………….. 1:9
  • 7mm PRC………………………………… 1:8
  • 7mm Remington Ultra Magnum 1:9.25
  • 7mm STW…………………… 1:9.25, 1:10
  • .30 Carbine……………………………. 1:16
  • .30-30 WCF……………………………. 1:12
  • .30 T/C………………………………….. 1:10
  • .30/40 Krag……………………………. 1:10
  • .308 Winchester…………….. 1:10, 1:12
  • .300 Savage……………………………. 1:10
  • .30-’06 Springfield…………………… 1:10
  • .30 Nosler……………………………… 1:10
  • .300 Winchester Magnum……….. 1:10
  • .300 Winchester Short Magnum. 1:10
  • .300 Remington Ultra Magnum… 1:10
  • .300 Weatherby Magnum……….. 1:10
  • .30-378 Weatherby Magnum…… 1:10
  • .300 Holland & Holland Magnum 1:10
  • .308 Norma Magnum……………… 1:10
  • .300 Remington SAUM……………. 1:10
  • .300 PRC………………………………….. 1:8
  • .300 Norma……………………………… 1:8
  • .303 British…………………………….. 1:10
  • 7.62x39mm……………………………. 1:10
  • .32 Winchester Special……………. 1:16
  • .325 Winchester Short Magnum. 1:10
  • 8x57mm Mauser………………….. 1:9.25
  • 8mm Remington Magnum……….. 1:10
  • 8x68S……………………………………. 1:11
  • .338-06 A-Square……………………. 1:10
  • .338 Federal…………………………… 1:10
  • .338 Winchester Magnum……….. 1:10
  • .338 Remington Ultra Magnum… 1:10
  • .338/378 Weatherby Magnum…. 1:10
  • .340 Weatherby Magnum……….. 1:10
  • .33 Winchester ………………………. 1:12
  • .338 Lapua………………………………. 1:9
  • .35 Remington……………………….. 1:16
  • .358 Winchester…………….. 1:14, 1:16
  • .35 Whelen……………………. 1:14, 1:16
  • .358 Norma Magnum……………… 1:12
  • .350 Remington Magnum………… 1:16
  • .357 Magnum (rifle) ………………. 1:16
  • 9.3x62mm……………………… 1:10, 1:14
  • 9.3x64mm……………………………… 1:14
  • 9.3x74mmR……………………. 1:10, 1:14
  • .375 Holland & Holland Mag 1:12, 1:14
  • .375 Ruger…………………………….. 1:12
  • .375 Remington Ultra Magnum… 1:12
  • .375 Weatherby Magnum……….. 1:12
  • .378 Weatherby Magnum.. 1:12, 1:14
  • .375 Dakota…………………………… 1:12
  • .375 Winchester…………………….. 1:12
  • .405 Winchester…………………….. 1:14
  • .450/400 3” NE………………………. 1:15
  • .404 Jeffery…………………. 1:14, 1:16.5
  • .416 Rigby……………………………… 1:14
  • .416 Ruger…………………………….. 1:14
  • .416 Weatherby Magnum……….. 1:14
  • .416 Remington Magnum 1:14, 1:16.5
  • .416 Barrett…………………………… 1:11
  • .500/416 NE…………………………… 1:14
  • .44 Magnum (rifle)………….. 1:20, 1:38
  • .444 Marlin……………………………. 1:20
  • .45-70 Gov’t…………………………… 1:20
  • .458 Winchester Magnum……….. 1:14
  • .458 Lott………………………… 1:14, 1:16
  • .450 3 ¼” NE………………………….. 1:16
  • .450 Rigby……………………………… 1:10
  • .458 SOCOM………………….. 1:14, 1:18
  • .450 Marlin……………………………. 1:20
  • .460 Weatherby Magnum……….. 1:16
  • .470 NE…………………………………. 1:21
  • .50 BMG………………………………… 1:15
  • .500 NE…………………………………. 1:15
  • .500 Jeffery……………………………. 1:17
  • .505 Gibbs……………………………….. 1:1
 
If y’all are old farts like me you’ll recall that the original 5.56/.223 AR’s had a slow twist (1-14 or 1-12, can’t recall which). Bullets were very lightly stabilized and would quickly upset when hitting anything, causing wounds far out of proportion to caliber. Then Unc decided they needed to penetrate stell lid at 300 meters. Heavier slug, faster twist. Super stabilized the round for range and penetration, but at a price of less lethality per round (made it a high speed drill)😏
 
Shibadog said:
If y’all are old farts like me you’ll recall that the original 5.56/.223 AR’s had a slow twist (1-14 or 1-12, can’t recall which). Bullets were very lightly stabilized and would quickly upset when hitting anything, causing wounds far out of proportion to caliber. Then Unc decided they needed to penetrate stell lid at 300 meters. Heavier slug, faster twist. Super stabilized the round for range and penetration, but at a price of less lethality per round (made it a high speed drill)😏
Click to expand...
I think my AR is 1/9
 
Shibadog said:
If y’all are old farts like me you’ll recall that the original 5.56/.223 AR’s had a slow twist (1-14 or 1-12, can’t recall which). Bullets were very lightly stabilized and would quickly upset when hitting anything, causing wounds far out of proportion to caliber. Then Unc decided they needed to penetrate stell lid at 300 meters. Heavier slug, faster twist. Super stabilized the round for range and penetration, but at a price of less lethality per round (made it a high speed drill)😏
Click to expand...
M16 was 1:12.
 
Bassbob said:
M16 was 1:12.
Click to expand...
I was thinking that. Lightly stabilized the standard slug. Initial reports from Vietnam told of massive wounding by the little round (ok, NOT as massive as the 105 effect they generate in the movies but still way out of proportion to the tiny slug😊). FWIW it’s also worth noting that the military spec’s a completely different powder that the weapon was designed to use-which caused an awful lot of issues with the rifles in the field initially, excessive fouling, etc.
 
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