Shotshell Friable Matrix Reduces Projectile Dispersion
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Solution Overview
Problem
Existing shotshell cartridges experience significant shot pellet deformation during acceleration due to direct contact with the barrel, leading to excessive dispersion, which is not adequately addressed by current buffering systems such as granulated particles, melted substances, or polyurethane foam, resulting in suboptimal pattern performance and potential regulatory violations.
Innovation Solution
A buffering system where a hard, brittle polymeric matrix surrounds the shot pellets, breaking apart upon firing to provide conformal support and reduce deformation, with the matrix being a polyurethane resin like Smash! Plastic®, which has specific mechanical properties to maintain pellet integrity and separate from the shot column after muzzle exit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If soft lead pellets are used with direct barrel contact, then ease of manufacture is improved, but shot pellet deformation increases leading to excessive dispersion
Solution Approach 1:
A cushioning material is introduced as an intermediary between the soft lead pellets and the barrel to prevent direct contact. This mediator absorbs the deformation forces during acceleration, allowing soft lead pellets to maintain their spherical shape while preserving ease of manufacture.
Solution Approach 2:
The cushioning material is positioned in advance within the barrel to provide pre-established protection for the pellets. This prior cushioning prevents deformation before it occurs during the acceleration phase, ensuring pellet integrity without requiring harder, more difficult-to-manufacture materials.
2Manufacturing precision
If granulated particles are intermixed in the shot column to buffer pellets, then pellet deformation is reduced, but dispersion rate remains considerable due to incomplete space occupation
Solution Approach 1:
The cushioning material transitions from a granulated particulate form to a foamed structure that expands to fill all inter-pellet spaces. This parameter change in physical state and volume ensures complete space occupation, eliminating the gaps that allow pellet deformation and dispersion while maintaining the buffering function.
Solution Approach 2:
The system combines the cushioning material with the shot pellets to create a composite structure where the foamed material fills all voids between pellets. This composite approach ensures complete space occupation and uniform buffering across the entire shot column, addressing the incomplete protection provided by granulated particles alone.
3Manufacturing precision
If tungsten-based shot is used, then pellet spherical shape is maintained reducing dispersion, but cost increases significantly and density is lower
Solution Approach 1:
Instead of using expensive tungsten pellets, the invention employs a disposable cushioning material that is sacrificed during firing to protect the lead pellets. This cheap, consumable buffer achieves the same shape-maintenance function as tungsten at a fraction of the cost, while the lead pellets retain their high density.
Solution Approach 2:
The cushioning material serves as an intermediary that performs the protective function previously achieved by expensive tungsten. This mediator absorbs the acceleration forces and prevents lead pellet deformation, eliminating the need for costly tungsten-based shot while maintaining pellet integrity and reducing dispersion.
4Object-generated harmful factors
If tighter choke constriction is applied, then shot dispersion is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The dispersion control function is extracted from the complex choke mechanism and transferred to a simpler cushioning material system. By removing the need for tight choke constriction and using a buffered shot column instead, the device complexity is reduced while maintaining effective pattern control.
Solution Approach 2:
The approach changes from mechanical constriction (choke) to material-based protection (cushioning). This parameter change in the control mechanism simplifies the device design, eliminating the need for complex adjustable chokes while achieving similar or better dispersion control through the buffered pellet structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces shot pellet dispersion, achieving pattern performance comparable to or exceeding tungsten-based loads at a lower cost, while maintaining pellet integrity and compliance with hunting regulations.
Implementation Method 1
a hard, brittle polymeric matrix surrounds the shot pellets, breaking apart upon firing to provide conformal support and reduce deformation
Implementation Method 2
The cushioning material preferably substantially completely separates from the shot column a short distance after muzzle exit without significant adherence to the pellets
Data Source
AI summary
An improved shotshell of the type having a hull, a head at the proximal end, propellant disposed in the hull, a wad disposed in the hull distal to the propellant, and a load disposed in the hull in distal to the wad. The improvement comprises the load including a plurality of individual shot, at least a portion of which are at least partially surrounded by a friable material that breaks up upon the firing of the shell to release to the shot and results in a reduced rate of dispersion of the plurality of individual shot compared to cartridges without the friable material.