The bullet used in Federal 62 grain Fusion ammunition is of the same design as the bullet found in Speer’s .223/5.56mm Gold Dot
Law Enforcement Ammunition. The bullet has a cannelure and the casemouth of the cartridge is crimped. Bullet “set-back” is no more an issue with this load than any other crimped .223/5.56mm load.
Sharp edges on the locking-lugs of the barrel extension are not the issue when using JSP ammunition. Lead build-up on the feed-ramps causing stoppages due to failures to feed is. The Gold Dot bullets have the least amount of exposed lead at the tip of any of the JSP loads that I have tested. So far, I’ve run 200 rounds of the Gold Dot ammunition (more rounds than any civilian or LEO is ever likely to fire in a single defensive shooting engagement ) at a time through my Colt AR-15 with no issues of lead build-up on the feed-ramps.

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