Does anyone know the exact diameter of Norma or Weatherby brass flash holes? I am buying flash hole debur tools and the .080 is larger than what they have and I have no desire to overbore them.

I don't have tools to measure the size, but thought someone here might know for sure. Is .060" the right size or is it larger? Is it metric? Thanks.

Which Weatherby caliber do you reload;you have to give more info,what are the problem you have;hard seating the primer etc...

I reload 240 and 300 Weatherby cartridges. Some have mentioned the primer holes are drilled and not punched from Norma, but others argue the other way.

Regardless which method is used, there are burrs on the inside of the flash holes in my brass from Weatherby and Norma. I want to remove it for the same reason people deburr brass from Winchester, Remington, etc.

I don't want to ream the flash holes oversize and I know they are smaller than .080".

Just looking for the correct diameter tool.

De-burring is done with a angled tool (like a mouth chamfering tool) from the inside. The idea is to just knock off the burrs and put a LIGHT bevel on the edges of the hole. The actual diameter of the hole (unless your reaming them for consistancy, which is a entirly different operation) dosn't matter for the deburing operation.

95, can you estimate how much smaller? How much effort does it take to get the tool through the flash hole? Bob

#47 drill is a bit loose in the flash hole of my norma 300 wsm brass, that measures out at .078. The # 46 bit (.081) does not enter it, but enters freely one on a winchester .308 shell.

""De-burring is done with a angled tool (like a mouth chamfering tool) from the inside. The idea is to just knock off the burrs and put a LIGHT bevel on the edges of the hole. The actual diameter of the hole (unless your reaming them for consistancy, which is a entirly different operation) dosn't matter for the deburing operation.""

You're Full Of Shit! Any flash hole deburring tool I've seen are little center drills. The pilot drill of the center drill HAS to enter the flash hole for the tapered part to deburr the flash hole!

My flash hole deburring tool doesn't enter the flash hole of the norma cases either!

Thanks for the responses.

grizz - I think your idea of trying different drill bits is the key. I know I want a drill which has the right pilot size. I talked to Russ Haydon a while back and he sell's the K&M and his own. The bit in the deburr tools is purchased from some milling tool supply and I am thinking I might be able to buy this same tool with the proper bit.

The .062 (1/16") pilot for the PPC deburr tool is too small, the .080" standard is too large. I'll have to measure and check with the tool suppliers for the part - something like McMaster Carr.

Why not just open up the holes to the standard diameter.

Norma used the diameter they did for a reason - some say a smaller flash hole diameter provides improved ignition.

I'm testing this for myself. I will probably bore a few to standard size to use in the evaluation.

Norma brass has a "drilled" rather than "punched" flash hole.

I have never felt a need to debur Norma flash holes as they don't appear to have a bur @ the flash hole.

That is one of the reasons I prefer Norma brass.