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Expanding Full Metal Jacket (EFMJ) bullets appear like standard FMJ externally but are engineered to expand on impact similar to hollow points. Federal's EFMJ line uses a rubber insert under a lead core that compresses on impact, forcing the jacket to open. This design was created for markets where hollow point ammunition is restricted but self-defense capability is still desired. EFMJ feeds like FMJ (important in older or problematic firearms) while providing expansion comparable to JHP. The technology bridges the gap between target and defensive ammunition.
EFMJ is designed for jurisdictions where hollow points are illegal or restricted (like New Jersey in certain contexts, or some international locations). It also feeds more reliably in older firearms that struggle with JHP profiles.
Is EFMJ as effective as JHP?
Testing shows comparable expansion and penetration to quality JHP ammunition. Federal's EFMJ consistently expands to 1.5x+ diameter while penetrating 12-14 inches in gel. For defense where JHP isn't available, EFMJ is an excellent alternative.