I'm a newbie and am starting to load for my 30-06 but am confused about what COL to use.
For 165g Hornady Interlock SP's the manuals and Hogdon web site give me a COL of 3.30 (the Lee manual says this is the minimum COL). However, if I make a dummy bullet to measure the actual length of my chamber (close the action allowing the bullet to move with little friction in the neck, then measure) I get 3.24", so less than the 3.30 recommended.
I understand that some 0.010" less than this length is ideal-ish for the "jump", so that would put me at 3.14", even shorter. I measured some factory loads (150gr Fed Premium with Sierra Gameking) and they were 3.17".
So what COL do I use?
thx
For 165g Hornady Interlock SP's the manuals and Hogdon web site give me a COL of 3.30 (the Lee manual says this is the minimum COL). However, if I make a dummy bullet to measure the actual length of my chamber (close the action allowing the bullet to move with little friction in the neck, then measure) I get 3.24", so less than the 3.30 recommended.
I understand that some 0.010" less than this length is ideal-ish for the "jump", so that would put me at 3.14", even shorter. I measured some factory loads (150gr Fed Premium with Sierra Gameking) and they were 3.17".
So what COL do I use?
thx