Ep. 229 – Engineering Accuracy: Inside Allterra Arms
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In this episode of The Hornady Podcast, host Seth Swerzyk sits down with Drew Foster and Dave Barnes from Altera Arms to explore the engineering precision behind their custom rifles. The conversation traces the company’s origin—from a napkin sketch to a revolutionary design philosophy focused on accuracy and reliability in extreme conditions. Key innovations include a patented bolt-to-bore system that transitions from loose clearance during cycling to tight tolerance in battery, a mortise-and-tenon barrel receiver joint to eliminate barrel-pointing variability, and ramp threading to distribute stress across all threads. The team also discusses their vertical integration, manufacturing in-house to maintain quality control, and the challenges of producing carbon-wrapped barrels with a proprietary substrate that solves thermal expansion mismatches between steel and carbon. These technical advancements are driven by a relentless pursuit of consistency, with every rifle tested to sub-half-minute accuracy before shipping. The episode also touches on evolving customer expectations, the importance of reliability in remote hunting environments, and the company’s commitment to American manufacturing and innovation. The discussion extends to cartridge preferences, with the 7 PRC and .22 Creedmoor being top choices due to their performance in short barrels and efficiency. Drew and Dave share their hypothetical picks for a single cartridge: the .22 Creedmoor for versatility and the 6mm ARC for legal flexibility across states. The episode closes with a reflection on the symbiotic relationship between ammunition and rifle engineering, emphasizing that true performance comes from every component working in harmony. The hosts highlight how Altera Arms’ dedication to incremental improvements—down to thousandths of an inch—sets them apart in the custom rifle market.
Altera Arms uses a patented bolt design that transitions from loose clearance during cycling to tight bench-rest-like tolerance in battery, ensuring both reliability and extreme accuracy.
Their mortise-and-tenon barrel receiver joint eliminates barrel-pointing variability by providing a stable, repeatable alignment independent of thread wear.
Ramp threading distributes load across all threads instead of overloading the first two, significantly improving barrel durability and consistency under high pressure.
Vertical integration—manufacturing actions, barrels, stocks, and composites in-house—allows for tighter tolerances, faster iteration, and full control over quality.
A proprietary substrate between steel and carbon in their carbon-wrapped barrels solves thermal expansion mismatches, preventing delamination and enabling consistent performance.
…and 3 more takeaways available in PodZeus
Introduction and Origin Story
“We wanted to figure out a way to get the most amount of accuracy out of a hunting gun, but still have it reliable in the worst conditions.”
The Bolt-to-Bore Innovation
“You have the best of both worlds when it's in battery—you have those bench rest, one or two thousandths tolerance across the diameter, but then you have eight or nine thousands clearance when you're cycling it.”
Mortise-and-Tenon Barrel Joint and Ramp Threading
“Now you could have significantly more torque without yielding those first two threads.”
Vertical Integration and Manufacturing Challenges
Altera Arms’ journey from relying on 36 suppliers to building their own machine shop in-house is explored. The company invested heavily in CNC machines, wire EDM, and in-house composite manufacturing to maintain control over quality, tolerances, and lead times.
Carbon-Wrapped Barrel Breakthrough
“It's super stupid expensive, this material. Like I could either buy a truck for one roll of this.”
“It's super stupid expensive, this material. Like I could either buy a truck for one roll of this.”
“You have the best of both worlds when it's in battery—you have those bench rest, one or two thousandths tolerance across the diameter, but then you have eight or nine thousands clearance when you're cycling it.”
“You don't buy a gun, you buy a gun company. Somebody is going to stand behind that.”
Host
Guests
Altera Arms
organization
Drew Foster
person
Dave Barnes
person
Seth Swerzyk
person
Hornady
organization
7 PRC
other
.22 Creedmoor
other
carbon fiber
other
6mm ARC
other
wire EDM
other
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