Shoulder Breeching Rifle Cartridge Seating Die

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing tools and techniques for loading rifle cartridges, particularly shoulder breeching cartridges, fail to accurately control bullet jump and concentricity due to inadequate consideration of the shoulder breeching mechanism, leading to variations in bullet position and deformation, which affect downrange accuracy.

Innovation Solution

The Shoulder Breeching Seating Die aligns the bullet to the axis of the shoulder using a three-stage process, with seating depth based on the distance between the shoulder datum and the bullet datum, independent of bullet tip shape or case body length, ensuring precise alignment and concentricity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If existing die designs control Cartridge Overall Length (C.O.L.), then the length from head to bullet tip is maintained, but variations in case body length cause uncontrolled variation in bullet jump for shoulder breeching cartridges

Engineering Contradiction:

Improvebullet jump controlVSAvoidcompatibility with different case body lengths

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The die design separates the control of case body length from bullet seating depth. The case body length variation is isolated to the shoulder position, while the bullet seating depth is independently controlled relative to the shoulder, allowing precise bullet jump control despite case variations

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention replaces the traditional C.O.L.-based mechanical control system with a shoulder-referenced control system. Instead of measuring from the case head, all critical dimensions are referenced from the case shoulder, fundamentally changing the mechanical reference framework

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If existing die designs use C.O.L. control, then rimmed and belted cases are properly handled, but shoulder breeching cartridges suffer from uncontrolled bullet position variations

Engineering Contradiction:

Improvecompatibility with rimmed and belted casesVSAvoidbullet position control

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The invention inverts the traditional approach by making the shoulder (rather than the head) the primary reference point for all measurements. This reversal allows shoulder breeching cartridges to be controlled precisely while maintaining compatibility with other case types through the universal applicability of shoulder referencing

Inventive Principle:

Principle #13The other way round (Inversion)

3Length of stationary object

If bullet seating depth is controlled from case head, then C.O.L. remains constant, but changes in case body length translate to changes in shoulder to bullet distance

Engineering Contradiction:

ImproveC.O.L. consistencyVSAvoidshoulder to bullet distance control

Core Design Contradiction:

Length of stationary objectVSManufacturing precision

Solution Approach 1:

The case shoulder serves as an intermediary reference point that decouples the relationship between case body length and bullet seating depth. By referencing all measurements from the shoulder rather than the head, the die acts as an intermediary that isolates case variations from bullet position variations

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10655944B1Bullet seating die for shoulder breeching rifle cartridges

Publication Date: 2020.05.19 GENT JEFFREY HOWARD

AI summary

A bullet seating die for assembling shoulder breeching rifle cartridges that aligns the bullet co-axial with the case shoulder. Bullet seating depth is set relative to the datum line of the case shoulder and is adjustable. Shoulder breeching rifle cartridges use the shoulder, exclusively, to position the cartridge in the chamber. Therefore, cartridges assembled with this die will position the bullet concentric with the bore of the barrel and at a set distance from the bore with greater precision and consistency than cartridges produced by die of previous designs.