Yes, primarily US Military blazoning of vintage Unit insignia, defined as strength in reserve.

However, one is not bound by the symbols denoted in the works of Fox-Davies, Parker, The American College of Heraldry, The Scottish Heraldry Society, etc.

If a powder horn conveys your truth succinctly, choose it. Then use the archetype powder horn which fits the majority schema: silhouette, shoulder strap, crown to dexter, tincture or metal, etc. Determine placement upon the field and from this point make adjustments to the specific image which may convey deeper meaning, such as crown to base, or "in proper", etc.

Slainte,
Domehead