In cartridge manufacturing, the flash hole is "punched" into the brass. While this is the least expensive method, it has many shortcomings and inconsistencies. The flash holes, therefore, are of different sizes and shapes. The most detrimental to accuracy are the irregular "breakouts" and "burrs" on the inside. This will cause "shot-to-shot" differences in Primer "Flame Fronts", causing inconsistent pressure/velocity and, thereby, loss of accuracy. Bench Rest Shooters have been uniforming flash holes since 1969.
|K & M Flash Hole Deburring Tool Sizes|
|Standard Rifle 0.080||PPC/BR 0.062|
|.17 Calibre||.20 Calibre|
Burrs left on the inside of the flash hole during manufacturing can cause erratic ignition. This handy tool automatically locates the hole and quickly removes the burr. A self-centering pilot collar with an adjustable stop allows quick alignment and prevents the removal of too much brass. It includes a Case Pilot Stop. Cases must all be trimmed to the same length before using this tool since the pilot stop controls the cutting depth.
|RCBS Flash Hole Deburring Tool w/Case Pilot Stop|
|RCBS Flash Hole Deburring Tool Case Pilot Stops|
|.22 Calibre||6MM||.25 Calibre|
|.30 Calibre||.32 Calibre||8MM Calibre|
|.34 Calibre||.35 Calibre||9.3MM|
|.375 Calibre||40/10MM||.41 Calibre|
|.44 Calibre||.45 Calibre|
During the manufacturing process, burrs that can cause erratic ignition are often left inside the case at the flash hole.
The universal tool is for all calibers from .22 thru .338 cal. using standard (.080”) flash holes. This tool controls the cutting depth with a built-in stop that locates on the inside web of the case. A unique feature of this tool is the cross drilled hole for chip relief. Uses standard pilot stops for 3/16” mandrels.
The small tool is for .17 & .20 cal. and cases with small (.060”) flash holes. This tool does not control the cutting depth. The operator must control the cutting depth using the small pilot stops for 9/64” mandrels.
|Redding Flash Hole Deburring Tool w/Handle Sizes|
|Large Rifle||Small Rifle|
|Redding Flash Hole Deburring Tool Pilot Only|
|.17 Calibre*||.20 Calibre*||.22 Calibre*|
|.22 Calibre||6MM Calibre*||6MM Calibre|
|.25 Calibre||6.5MM Calibre*||6.5MM Calibre|
|270 Calibre||7MM Calibre||.30 Calibre|
|.31 Calibre||8MM Calibre||.338 Calibre|
|*Pilots for small diameter 9/64" manderels|
This flash hole deburring tool features stainless steel construction and chip clearance slots which alleviate the tendency of the tool to collect chips in the end of the cutting shaft. This tool is inserted in the case mouth and uses the web of the case as a safety stop. A couple of turns will remove any burrs and leave a small chamfer on the inside edge of the flash hole. Flash hole deburring is a one-time operation. Since variations of case length do not affect the use of this tool, flash hole deburring is most easily performed on brand new brass without trimming.
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