The CONTOUR #3 25710CM3 is the Douglas .257 1-10 Twist CM #3 Contour Ultra Rifled Barrel, a premium 25-caliber (.257) chrome moly barrel blank designed for shooters and gunsmiths who demand top-tier accuracy from their custom builds and rebarrel projects. Built as part of Douglas’s famous Double XX, Ultra Rifled line, this #3 contour barrel delivers the consistency, smoothness, and stress-relieved performance that precision rifle shooters have trusted for decades. Brownells UK+1
If you’re planning a .25-caliber custom rifle—for cartridges such as .257 Roberts, .25-06 Remington, or a .25-caliber wildcat—the Douglas 25710CM3 gives you a match-capable foundation with proven real-world performance.
Douglas Double XX Ultra Rifled – Premium-Grade Accuracy
The 25710CM3 barrel belongs to Douglas’s Ultra Rifled #3 Contour Double XX series, known for exceptional quality and tight tolerances:
Button rifled for a remarkably smooth bore and consistent rifling geometry. The Nook of Joy+2GearChase+2
Groove diameter and straightness tolerances held to about 0.0005", supporting true match-grade potential. The Nook of Joy+2GearChase+2
6-groove rifling in this caliber range (.22 through .338), giving even, repeatable engagement with the bullet jacket. The Nook of Joy+2GearChase+2
Every barrel is stress relieved, with no post-rifling straightening required—Douglas designs the process so it comes off the machine true. The Nook of Joy+1
This level of care is why Douglas Double XX barrels have long been a favorites for precision hunting rifles, varmint rigs, and competition builds.
.257 Caliber with 1:10 Twist – Versatile 25-Cal Performance
The 25710CM3 is optimized around .257" (25 caliber) bullets with a 1:10" twist rate: Brownells UK+1
Caliber: 25 caliber (.257)
Twist Rate: 1 turn in 10 inches (1:10)
Style: Ultra Rifled #3 Contour Barrel Blank
A 1:10 twist in .257 is extremely versatile and well-suited to a wide range of bullet weights commonly used in .257 Roberts, .25-06 Rem, and similar cartridges—from lighter varmint bullets up through popular big-game weights (always confirm with your bullet manufacturer’s recommendations).
This twist rate helps stabilize flat-shooting hunting bullets and high-BC projectiles, making it a great choice for western big-game rifles, dual-purpose varmint/deer rifles, and long-range coyote guns.
Chrome Moly Steel #3 Contour – Balance of Weight & Rigidity
Contour #3 sits in the “sporter to light-medium” range, ideal for a rifle that has to both carry well and shoot tight:
Material: 4140 chrome moly steel, a proven barrel alloy known for toughness and excellent machining characteristics. The Nook of Joy+1
Contour: #3 – a slimmer hunting/field profile than heavy tactical barrels, but still stiff enough for consistent accuracy and solid heat management. Primary Tactical+1
Chrome moly barrels can be blued, Parkerized, or coated (Cerakote, etc.) after all machining is done, making it easy to match the rest of your rifle’s finish. The Nook of Joy+1
For a hunter or practical long-range shooter, the #3 contour is a sweet spot—lighter than heavy target barrels, but not a whippy featherweight.
Unturned Ultra Rifled Blank – Ready for Custom Chambering
The CONTOUR #3 25710CM3 is supplied as a rifle barrel blank, giving your gunsmith full control over final dimensions:
Configuration: Ultra Rifled #3 Contour barrel blank – not threaded, not chambered, not crowned. Brownells+2The Nook of Joy+2
Unturned blank dimensions are intentionally 0.025"–0.050" larger in diameter and about 1.5" longer than the finished spec, allowing your smith room to dial in the exact profile and length you want. Brownells+2The Nook of Joy+2
Your gunsmith will cut the chamber, thread the shank, turn the final contour (if desired), and crown the muzzle to fit your specific action and application.
This flexibility is perfect for high-end rebarrel work on actions like the Remington 700, Savage 110, Winchester 70, and many custom actions, as long as they are suitable for your chosen .25-caliber cartridge.
Built for Serious Accuracy – From Varmints to Big Game
The Douglas .257 1-10 Twist CM #3 Contour Ultra Rifled Barrel is a natural fit for:
Flat-shooting varmint and predator rifles in .25-cal cartridges where long-range performance and explosive terminal effect are prized.
All-purpose big-game rifles that may see everything from antelope and deer to coyotes and hogs.
Custom rebarrel projects where a favorite action is getting new life with a modern, accurate barrel.
Precision hunting rigs, where sub-MOA performance and repeatable cold-bore shots are important.
Paired with competent gunsmithing and tuned handloads or quality factory ammo, this Douglas barrel blank has the pedigree to support excellent group sizes and long-range consistency.
Key Features – CONTOUR #3 25710CM3 (.257 1-10 Twist CM #3 Ultra Rifled)
From Douglas and major distributors: gunpowerfactory.com+4Brownells UK+4Primary Tactical+4
Manufacturer: Douglas
Model / MFR Part #: 25710CM3
Product Name: CONTOUR #3 – .257 1-10 Twist CM #3 Contour Ultra Rifled Barrel
Caliber: 25 caliber (.257)
Twist Rate: 1:10"
Style: Ultra Rifled, Double XX premium-grade barrel blank
Material: 4140 Chrome moly steel
Contour: #3
Rifling: Button rifled; 6 grooves in this caliber range
Quality: Douglas Double XX, stress-relieved, no post-rifling straightening
Configuration: Unthreaded, unchambered, uncrowned barrel blank (gunsmith fitting required)
(Exact finished length and muzzle diameter will depend on how your gunsmith turns and fits the barrel.)
Why Choose the Douglas CONTOUR #3 25710CM3 Barrel Blank?
You’ll want this specific barrel if you:
Are building or rebarreling a .25-caliber rifle and want a proven .257 1-10 twist configuration.
Prefer the balance of a #3 contour chrome moly hunting barrel that’s accurate yet still easy to carry.
Trust the reputation of Douglas Double XX, Ultra Rifled barrel blanks for their button-rifled smoothness, tight tolerances, and stress-relieved consistency.
Want the flexibility of an unchambered blank, giving your gunsmith room to tailor the barrel exactly to your chosen action, cartridge, and application.
For custom rifle builders, gunsmiths, and serious shooters, the CONTOUR #3 25710CM3 – Douglas .257 1-10 Twist CM #3 Contour Ultra Rifled Barrel is a rock-solid, premium-grade choice that combines precision manufacturing, proven materials, and practical field performance in one high-value barrel blank.
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