Prefit vs blank barrel

[Skyguy1217]

I’m looking into ordering a 7mm backcountry barrel from proof. They have prefits in 20in, but I’d like to get one in 18in. I can spec out a blank barrel to be 18in with a 1:8 twist and is for a .284 bullet. How does a spec’d out blank go from a .284 diameter to a 7BC? Sorry for the dumb question in advanced still getting into barrels and bullet selection.

 

[wind gypsy]

I’m looking into ordering a 7mm backcountry barrel from proof. They have prefits in 20in, but I’d like to get one in 18in. I can spec out a blank barrel to be 18in with a 1:8 twist and is for a .284 bullet. How does a spec’d out blank go from a .284 diameter to a 7BC? Sorry for the dumb question in advanced still getting into barrels and bullet selection.

A gunsmith reams a 7BC chamber in the blank and cuts tennon threads to fit your receiver. They'd also cut muzzle threads if desired.

Expect gunsmithing cost to be $375-500 for chambering/fitting to rifle and muzzle threading.

 

[One300wsm]

You will need a gunsmith to chamber it for a 7 BC. You would probably save money just going with a barrel company that will make what you want and install your receiver. Below are a few I have used, all of them offer the 7 BC cartridge.
Marshal at Preferred is an awesome guy he will be more than willing to help you and answer any questions you have.

New 2023 Home Page

American Made Prefit Gun Barrels Specialized Barrel Blanks For Precision Firearms At Preferred Barrel Blanks, we come to work every day to provide top-quality barrels in a respectable time frame at a fair price. In-Stock BarrelsPrefit BarrelsRemage, 280 Remington, 27 Inch, Custom Varm, 8 Twist...

preferredbarrelblanks.com

Carbon Fiber Hunting Rifles | Oregon Mountain Rifle Co.

Custom-built ultralight rifles and components for serious hunters and long-range shooters. Made in the USA with aerospace-grade carbon fiber.

omrifles.com

Carbon Six Barrel

Buy your carbon fiber rifle barrel here. Check out our news section for happy customer images and the latest news. Carbonsix Replacement Rifle Barrels are designed with two things in mind: weight reduction and accuracy improvement. We start with world-class McGowen Precision Barrel blanks...

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[EastHumboldt]

It might be cheaper to order the 20 inch barrel and have it cut and threaded if the barrel profile permits that. I said, that’s not knowing what the two different barrels cost.

 

[wind gypsy]

It might be cheaper to order the 20 inch barrel and have it cut and threaded if the barrel profile permits that. I said, that’s not knowing what the two different barrels cost.

Because he said proof, i assume he means carbon fiber and its not ideal to chop into the carbon fiber.

 

[hereinaz]

.284 caliber is the same as 7mm, sounded like that might have been a question.

Like they said, a barrel blank has the bore drilled and usually contoured. A smith chambers it.

Other prefit companies will do them custom for you. If the barrel is 24” or less, the juice is not worth the squeeze for a carbon fiber. Go with a steel barrel and weight/stiffness is same or better than CF, unless you want the look or contour.

 

[Skyguy1217]

It might be cheaper to order the 20 inch barrel and have it cut and threaded if the barrel profile permits that. I said, that’s not knowing what the two different barrels cost.

If you get a carbon fiber barrel they have a steel piece at the end that holds all the tension in the carbon fiber. If you cut it then it ruins the stiffness of the barrel.