The Firing Line Forums - View Single Post - Cartridge Length

Fox1 · September 28, 2008, 03:47 PM

I'm loading 9mm, 115 gr MagTech or Rainier bullets at 4.2 gr.

The Hornaday book calls for a C.O.L. of 1.100" but it comes out pretty short. Very noticeable when placed beside factory loads.

I measured some Winchester factory rounds and their C.O.L. is 1.160".

I realize that the depth of the bullet can vary internal pressures but what should one do in a situation this extreme?

I have been loading them at 1.135" then testing them in my magazine and they work just fine. They also shoot fine as well.

Do I just stick to 1.135" from here on?

September 28, 2008, 03:47 PM	#1
Fox1 Senior Member Join Date: September 27, 2008 Posts: 300	Cartridge Length - Book vs. Practical I'm loading 9mm, 115 gr MagTech or Rainier bullets at 4.2 gr. The Hornaday book calls for a C.O.L. of 1.100" but it comes out pretty short. Very noticeable when placed beside factory loads. I measured some Winchester factory rounds and their C.O.L. is 1.160". I realize that the depth of the bullet can vary internal pressures but what should one do in a situation this extreme? I have been loading them at 1.135" then testing them in my magazine and they work just fine. They also shoot fine as well. Do I just stick to 1.135" from here on?