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1100 tac · February 19, 2019, 07:40 AM

"well damn, I was just wrong about everything on that tap

here is a link on Amazon for a tap and drill combo $19. They do not even use a L, this one is a 7.3 MM which is which is between a 9/32 and a L . I wonder if Hornady could have found a stranger thread size ?"

Yeah, it sure does seem like they worked at it, but considering the relatively thin area to be threaded and the aluminum tool, I guess they went for all the threads they could get without the threads stripping off of the tool.

Guffy's advice about using the die to hold the case is spot on, I used a 3" chunk of 1-1/4 aluminum round bored and internal threaded 7/8x14 to hold the die in my lathe chuck. You do have to take the de-capping stem out of the size die.

Another way is to just use the "factory" modified case and just do the math.

February 19, 2019, 07:40 AM	#30
1100 tac Senior Member Join Date: February 7, 2012 Posts: 299	"well damn, I was just wrong about everything on that tap here is a link on Amazon for a tap and drill combo $19. They do not even use a L, this one is a 7.3 MM which is which is between a 9/32 and a L . I wonder if Hornady could have found a stranger thread size ?" Yeah, it sure does seem like they worked at it, but considering the relatively thin area to be threaded and the aluminum tool, I guess they went for all the threads they could get without the threads stripping off of the tool. Guffy's advice about using the die to hold the case is spot on, I used a 3" chunk of 1-1/4 aluminum round bored and internal threaded 7/8x14 to hold the die in my lathe chuck. You do have to take the de-capping stem out of the size die. Another way is to just use the "factory" modified case and just do the math. Last edited by 1100 tac; February 19, 2019 at 07:51 AM.