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This is Proof Research's PXT carbon fiber barrel blank in .308 caliber, cut to 18 inches with a 1-10 twist and their popular Sendero contour. It comes ready for a gunsmith to chamber, thread, and crown for your build. The whole package tips the scale at 2 pounds 8 ounces, which is remarkable for a barrel this stiff, and that weight savings is where carbon fiber earns its keep on a backcountry hunting rifle or a lightweight precision setup.
Proof builds these the same way they've built their reputation, starting with a match-grade 416R stainless liner turned down to a slim profile, then wrapped in high-strength aerospace-grade carbon fiber set in a proprietary resin. That carbon wrap does more than shave weight. It pulls heat down the length of the barrel and sheds it faster, so your groups hold together during longer strings and the barrel simply lasts longer.
PXT stands for Proof Exponential Twist, and it's the newer piece of the story here. Instead of the sharp, aggressive rifling engagement most barrels use, PXT starts with an extremely gradual twist at the breech and accelerates through the bore, which softens how the bullet first meets the rifling. The result is less engraving force, a smoother pressure curve, and noticeably less throat erosion up front where barrels normally wear out first. In Proof's own testing, PXT barrels showed a 30 to 100 percent increase in barrel life while holding the accuracy Proof is known for.
The 1-10 twist is the sweet spot for .308 Winchester, stabilizing 168 to 175 grain match and hunting bullets that most people shoot in this cartridge. An 18-inch length keeps things handy and quick without giving up much velocity, which makes it a natural fit for a lightweight hunting rig, a compact precision build, or a suppressed setup. This is a blank meant for gunsmiths and serious builders who want a premium starting point they can spin up to their exact chamber and thread specs.
No, this is an unchambered blank. It's designed to be chambered, threaded, and crowned by a qualified gunsmith so it can be fit precisely to your action and build. That's exactly what custom builders and gunsmiths want from a blank like this.
It's a 1-10 twist, which is the go-to for .308 Winchester. That twist reliably stabilizes the 168 to 175 grain match and hunting bullets most people run in this cartridge, and it still does fine with common lighter loads.
PXT stands for Proof Exponential Twist. It uses a very gradual twist at the breech that accelerates through the bore along with a smoother rifling profile, which lowers engraving force and reduces throat erosion. In Proof's testing that translated to a 30 to 100 percent increase in barrel life while keeping their accuracy standard.
This blank weighs 2 pounds 8 ounces, which is light for a Sendero contour with this kind of stiffness. Proof turns down a match-grade steel liner and wraps it in aerospace-grade carbon fiber, so you get heavy-contour rigidity closer to sporter weight. The carbon wrap also helps the barrel dump heat faster during longer strings.
| UPC | 843068154229 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 154229 |
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