The Firing Line Forums - View Single Post

jmorris · June 13, 2012, 08:04 AM

It depends on the powder and case/mandrel you are using but some combinations will alert within +-.5 grains.

So you can visualize why powder, case and mandrel would make a difference, think of a 38 spl case using trailboss. With the mid sized mandrel, bulky powder and tall skinny case there is a lot of movement in height of the powder collum with small changes in charge weight.

On the flip side look at something like the 223 SSWM and 748. You have to use the small mandrel to fit inside the case mouth but then you have a very wide case and dense powder by weight. To move the collum the same .1" takes not only more volume but more weight (per unit volume) as well.

June 13, 2012, 08:04 AM	#4
jmorris Senior Member Join Date: November 22, 2006 Posts: 3,077	It depends on the powder and case/mandrel you are using but some combinations will alert within +-.5 grains. So you can visualize why powder, case and mandrel would make a difference, think of a 38 spl case using trailboss. With the mid sized mandrel, bulky powder and tall skinny case there is a lot of movement in height of the powder collum with small changes in charge weight. On the flip side look at something like the 223 SSWM and 748. You have to use the small mandrel to fit inside the case mouth but then you have a very wide case and dense powder by weight. To move the collum the same .1" takes not only more volume but more weight (per unit volume) as well.