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Bartlein Barrels

Bartlein Barrel - SS, 7mm, B#12 Heavy Palma, 9 twist, 29'' blank, 5R

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Bartlein Barrels - Precision Rifled Barrels

Bartlein SS 7mm B#12 Heavy Palma Barrel - A Comprehensive Overview

Bartlein Barrels, renowned for their precision rifling, presents the SS 7mm B#12 Heavy Palma 29'' barrel with 5R rifling. This barrel is a pinnacle of craftsmanship, offering superior performance for shooting enthusiasts and professionals alike.

Contour and Weight Impact

The contour of a barrel significantly influences its weight and shooting behavior. The Heavy Palma contour of our SS 7mm model offers a balance between heft and agility. Unlike button-rifled barrels, our single-point cut rifling process does not induce stress, making the contour choice less critical for performance.

Advantages of Single Point Cut Rifling

Our barrels stand out with single point cut rifling, avoiding the internal stresses commonly seen in button rifling. This technique ensures uniform bore size, enhancing accuracy and longevity. It's particularly advantageous when threading the muzzle for brakes or suppressors, maintaining bore integrity at the muzzle's crown.

Fluting for Performance and Aesthetics

Fluting enhances our barrels in three ways: it reduces weight, improves cooling by increasing surface area, and adds a distinctive aesthetic. We ensure optimal fluting depth to maintain barrel harmonics and accuracy.

Suppressor Compatibility

Not all barrel contours are suitable for suppressor attachment. We recommend using suppressors with medium Palma or heavier contours to maintain harmonic stability and performance.

5R Rifling - The Bartlein Advantage

Our 5R rifling, featuring a gentler land-to-groove transition and an odd number of lands, minimizes bullet deformation. This unique design enhances bullet flight and reduces the likelihood of bullet failure, especially beneficial for long-range shooting.

Choosing the Right Rifling

While we offer various rifling styles, our experience and customer feedback highlight that the number of grooves does not significantly affect accuracy or barrel life. Our 5R rifling, however, is particularly advantageous for certain bullet types, enhancing their performance.


The Bartlein SS 7mm B#12 Heavy Palma 29'' barrel, with its 5R rifling, represents the pinnacle of barrel design, catering to a wide range of shooting applications. Whether you are a competitive shooter or a hunting enthusiast, the precision and quality of Bartlein Barrels are unmatched. Our commitment to excellence ensures that each barrel we produce offers outstanding accuracy, longevity, and satisfaction.

Contact our expert team at Bartlein Barrels to discuss your precision barrel needs.

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Additional Information

Caliber / Bore Size:
B#12 Heavy Palma
29in Blank
Stainless Steel
Twist Rate:
1 in 09.00in
Groove Type:
# Grooves:
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