Brass cases Peterson .243 Winchester LRP

Peterson .243 Winchester LRP brass is a premium component for handloaders who require excellent dimensional consistency, uniform internal capacity and repeatable neck tension. The Large Rifle Primer configuration provides dependable ignition and makes this version particularly suitable for hunting ammunition, slow-burning propellants and use in low temperatures.

Peterson manufactures its cases in the USA from C260 cartridge brass. The production process includes multiple drawing operations, forming the case head and primer pocket, precision trimming, punching the flash hole and final induction annealing of the neck and shoulder. Induction annealing allows the temperature applied to each case to be precisely controlled, helping to achieve consistent material properties throughout the production batch.

The LRP version uses a Large Rifle Primer pocket and a standard 0.080" flash hole, measuring approximately 2.03 mm. Compared with the SRP version, the larger primer can provide more energetic and reliable ignition, especially with larger charges of slow-burning powder or in cold-weather conditions.

Peterson brass is often compared favourably with Lapua brass in user reviews. The most commonly reported advantages include low case-weight variation, uniform neck-wall thickness, minimal runout, consistent case length and a strong construction suitable for repeated reloading. Users also frequently report that Peterson primer pockets remain tight after multiple firing cycles.

KEY ADVANTAGES

• Large Rifle Primer pocket,
• standard 0.080" (2.03 mm) flash hole,
• dependable ignition with slow-burning propellants,
• suitable for hunting and cold-weather applications,
• manufactured from C260 cartridge brass,
• tight and precisely formed primer pockets,
• uniform case and neck-wall thickness,
• consistent internal case capacity,
• induction-annealed neck and shoulder,
• precisely trimmed case mouth,
• designed for multiple reloading cycles,
• every case inspected during production,
• manufactured in the USA,
• supplied in a protective plastic box containing 50 cases.

TECHNICAL SPECIFICATIONS

Manufacturer: Peterson Cartridge
Calibre: .243 Winchester / .243 Win
Alternative calibre designation: 6.17 × 51 mm
Product type: new rifle brass cases
Condition: new and unfired
Material: C260 cartridge brass
Case type: rimless, bottleneck
Primer pocket: Large Rifle Primer – LRP
Flash-hole diameter: 0.080" / approximately 2.03 mm
Primers included: no
Neck and shoulder treatment: induction annealed
Finish: cleaned brass
Quantity: 50 cases
Packaging: durable plastic ammunition box
Country of manufacture: USA
Manufacturer number: PCC243WIN50 / 40007R
UPC: 859449006407

.243 WINCHESTER STANDARD DIMENSIONS

Maximum case length: 51.94 mm / 2.045"
Maximum case body diameter near the head: 11.96 mm / 0.471"
Maximum case-head diameter: 12.01 mm / 0.473"
Maximum shoulder diameter: 11.53 mm / 0.454"
Maximum outside neck diameter: 7.01 mm / 0.276"
Bullet diameter: 6.17 mm / .243"

PETERSON REFERENCE DATA – LOT N103B

Average empty case weight: 172.1 gr / approximately 11.15 g
Average internal capacity: 52.8 gr H₂O / approximately 3.42 cm³
Shoulder diameter: 0.449" / approximately 11.40 mm
Base diameter: 0.469" / approximately 11.91 mm
Neck-wall thickness: 0.0145" / approximately 0.368 mm
Loaded neck diameter: 0.273" / approximately 6.93 mm
AMP Aztec code for lot N103B: 0153
AMP pilot: #11

The weight, internal capacity and dimensional values above are reference measurements published for a specific production lot. Measurements may vary slightly between production batches.

IMPORTANT INFORMATION

The internal capacity of Peterson brass may differ from cases produced by other manufacturers. Whenever changing case brands or switching between SRP and LRP brass, the load should be developed again, beginning with safe starting data from a current and reputable reloading manual.

The use of Large Rifle Primers does not mean that SRP load data can be transferred directly. Primer type, case capacity, propellant and other components can all affect pressure and velocity. Never exceed the maximum pressures specified by C.I.P. or SAAMI.

FAQ

Do these cases include primers?

No. These are new, unprimed and unloaded brass cases.

What is the difference between LRP and SRP brass?

The LRP version uses a Large Rifle Primer pocket and a 0.080" flash hole. The SRP version uses a Small Rifle Primer pocket and a smaller 0.060" flash hole.

What are the advantages of the LRP version?

Large Rifle Primers generally provide a stronger ignition impulse. This can be beneficial with slow-burning propellants, larger powder charges and ammunition intended for use in low temperatures.

Is LRP brass suitable for hunting ammunition?

Yes. The LRP version is often selected for hunting ammunition because of its dependable ignition, particularly when the ammunition may be exposed to low temperatures.

Are the cases ready for handloading?

The cases are factory annealed and cleaned. Nevertheless, every case should be inspected, measured and prepared according to your normal case-preparation procedure and the instructions provided by the manufacturers of the components being used.

Does LRP brass provide better accuracy than SRP brass?

Neither version automatically guarantees better accuracy. The final result depends on the rifle, primer, propellant, bullet and load-development process. LRP is generally selected for dependable ignition, while SRP is often chosen for primer-pocket durability and potentially lower velocity variation.