how much variance in case weight for charge change

leroy1957 · October 24, 2013, 12:20 PM

I'm working in .308; I'm trying to make the loading a little simpler, if possible. My LC '07 averages 175.6g, and I use this case to develop charges. At what point in case weight variance, or in case volume capacity, do you need to recalculate the charge (e.g., if the case volume decreases 5% no need to change, but if 10%, change required)?
Many thanks, from a relative rookie.

Bart B. · October 24, 2013, 12:51 PM

A "rule of thumb" for years with rifle cartridges has been for every 10 grains more of case weight, reduce the powder charge weight 1 grain. Or something like that.

leroy1957 · October 24, 2013, 01:16 PM

Can't thank you enough for the advice.

October 24, 2013, 12:20 PM	#1
leroy1957 Junior Member Join Date: March 26, 2013 Posts: 3	how much variance in case weight for charge change I'm working in .308; I'm trying to make the loading a little simpler, if possible. My LC '07 averages 175.6g, and I use this case to develop charges. At what point in case weight variance, or in case volume capacity, do you need to recalculate the charge (e.g., if the case volume decreases 5% no need to change, but if 10%, change required)? Many thanks, from a relative rookie.

October 24, 2013, 12:51 PM	#2
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	A "rule of thumb" for years with rifle cartridges has been for every 10 grains more of case weight, reduce the powder charge weight 1 grain. Or something like that. Last edited by Bart B.; October 24, 2013 at 01:03 PM.

October 24, 2013, 01:16 PM	#3
leroy1957 Junior Member Join Date: March 26, 2013 Posts: 3	Can't thank you enough for the advice.