Lyman 7777760 Flash Hole Uniformer Deburring Tool - .22 to .45 Cal

The Lyman Flash Hole Uniformer is a hand-held case-prep tool built for one critical step in any reloading workflow: deburring and uniforming the flash hole in your .22 to .45 caliber brass cases. A clean, consistent flash hole promotes reliable powder ignition from round to round, which directly translates to tighter extreme-spread and standard-deviation numbers on the chronograph and more predictable performance downrange.

The tool pairs a hard steel cutter and shaft with a shoulder stop, mounted in an ergonomic plastic handle for controlled hand-feeding into each case mouth. An adjustable stop collar sets the depth of cut so the reloader can dial in repeatable geometry at each caliber, and an adjustable cone adapter lets the single tool span the full range of rifle and pistol case lengths without swapping parts.

Coverage runs across .22, .24, .25, .27, .28, .30, .35, .44, and .45 caliber flash holes and is rated for use from the .22 Hornet up to the .45-70 Government. Compact and time-tested, the Lyman Flash Hole Uniformer is a straightforward addition to any handloading bench. Lyman part number 7777760.