Rifle Barrel Twist Rates Available at EABCO
For TC Encore Factory and Custom Barrels, Savage Bolt Guns, Model 97D Rifles and BF Pistols
Thompson Center
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Garfield, MN 56332
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EABCO Twist Rates
The optimum rate of twist for a barrel depends on the particular cartridge, caliber, and bullet weight you are wanting to use. Here are the twists we offer: .17 Cal - 1:10, 1:9 .22 RF Cal - 1:16 .22 CF Cal - 1:7, 1:9, 1:12, 1:14 6mm/.243 - 1:8, 1:10, 1:12 6.5mm/.264 - 1:8 .270 Cal - 1:10 7mm/.284 - 1:9 30 Cal - 1:8, 1:10, 1:12 338 Cal - 1:10 |
Choosing
Your Custom EABCO Twist Rate
You can special order your choice of rifling twist rate when you order a made-to-order Encore Accuracy Barrel, or made-to-order Model 97DRifle. We have standards we recommend for various chamberings so you don't have to figure this out yourself. But if you'd like to know some guidelines and reasons, here they are: 17 Caliber: Use 1:9 for the rimfires and 1:10 for the centerfires. 22 CF (Centerfire): 1:7 is only for the heaviest bullets. 1:12 shoots 40-50gr bullets accurate in 223 and up to 55gr, accurate in 22-250. 1:14 is only for the lightest bullets. 6mm/.243: Use 1:8 for 90-100gr bullets. 1:10 for 75-85gr. Use 1:12 for lightest bullets (ie. 58gr in 6PPC). On 30 calibers, a 1:10 twist is the best all-around. We DO build a few 30's in 1:8 twists for folks who shoot the heaviest bullets. 308 shooters prefer 1:12 for 155 gr bullets. The rule of thumb with twist rates is this: It is better to err on the side of too fast of a twist rather than too slow. Choice of twist rate is only available when you order a custom barrel or gun made by E. Arthur Brown Company. Thompson Center barrels have standard twists... |
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Current Thompson Center Factory and Custom Shop Twist Rates -
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To the best of our knowledge, these are the current twist rates in Thompson Center barrels that come as factory standards and from the TC Custom Shop (Fox Ridge). We supply the full range of factory barrels... Click Here for factory barrel prices. We also supply the TC Custom Shop made-to-order barrels... Click Here for Custom Shop barrel information. 
Click Here For the Main T/C Menu |
All 17 Centerfire 1:10
All 22 Centerfire 1:12 All 6mm/.243 1:10 All 25 Caliber 1:10 All 6.5mm/.264 1:8 All .277 Caliber 1:10 All 7mm/.284 1:9 All 30 Caliber 1:10 All 338 Caliber 1:10 All .375 Caliber 1:12 |
General TC Twist Rates by Chamber... Scroll Down for Special Pistol Barrel Twist Rates.
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TC Pistol Barrel Twist Rates
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