kilotanker22
New member
I have used a RCBS Rock Chucker for years. I have never had a problem with inconsistently sized cases. It has been excellent really. So Recently I decided to buy a Lee Challenger aluminum press. I found it new in the box although it is over a decade old.
What I have found over the last couple of months is that obviously the aluminum press flexes a lot more than my cast iron Rock Chucker. When my full length die is set on the Rock Chucker, shoulder set back is very consistent. Showing less than .001" difference in shoulder set back through a run of 50 cases. I did this test multiple times with once fired cases as well as cases that have been fired and sized several times. I also performed this test with the Lee Classic Press. With the Lee press, I see an extreme spread of .002-.004" through a run of 50 cases. Quite often I have to run a case through the die several times to get the right set back when using the Lee press.
Just an observation I figured I would share.
What I have found over the last couple of months is that obviously the aluminum press flexes a lot more than my cast iron Rock Chucker. When my full length die is set on the Rock Chucker, shoulder set back is very consistent. Showing less than .001" difference in shoulder set back through a run of 50 cases. I did this test multiple times with once fired cases as well as cases that have been fired and sized several times. I also performed this test with the Lee Classic Press. With the Lee press, I see an extreme spread of .002-.004" through a run of 50 cases. Quite often I have to run a case through the die several times to get the right set back when using the Lee press.
Just an observation I figured I would share.