oldmodel70
Member
Hi and Good Evening. I reload for three .30-06s. A Model 70 from about 1950; a Sako Finnbear from about 1975 and a Model 70 Classic made around 1995.
The goal is to resize cases to a base to mid-shoulder length of 4.243 as measured using a Hornady Headspace Gauge Tool. I know that sounds like a very long '06 case but, as you probably know, the gauge takes the reading including the length of the tool. The reading is relative; just to show the amount the shoulder of the fired case has been moved during resizing.
Some measurements: the gauge gave a length of 4.241, 4.242 to the datum line for most cartridges in a box of new factory Remington cases. Post - firing, some of the cases were longer to the datum; some about the same and some SHORTER. The shorter ones were 4.238/4.239 to the datums. One new cartridge had measured 4.244 and it was 4.241 after firing.
I get this same phenomenon with all three rifles. The problem is that it is difficult to resize the short cases. I need to resize once with the die screwed up some (which lengthens the distance to the shoulder) and then do it again adjusting the die down to try for the desired length of 4.243. I think this overworks the brass and some cases never do reach a suitable length and have to be pitched. Few can be sized to more than 4.241 while all these chambers can take a longer case.
Can someone explain what may be happening or what I may be doing wrong?
The bullet weight is 150 gr. I have had the same thing happen with Federal brass. I check all resized cases in a Lyman Case gauge.
For contrast, cases fired in an M-1 are 4.250 to the datum as measured with the Hornady gauge. It is a one step matter to size these down to 4.243.
Any help greatly appreciated.
The goal is to resize cases to a base to mid-shoulder length of 4.243 as measured using a Hornady Headspace Gauge Tool. I know that sounds like a very long '06 case but, as you probably know, the gauge takes the reading including the length of the tool. The reading is relative; just to show the amount the shoulder of the fired case has been moved during resizing.
Some measurements: the gauge gave a length of 4.241, 4.242 to the datum line for most cartridges in a box of new factory Remington cases. Post - firing, some of the cases were longer to the datum; some about the same and some SHORTER. The shorter ones were 4.238/4.239 to the datums. One new cartridge had measured 4.244 and it was 4.241 after firing.
I get this same phenomenon with all three rifles. The problem is that it is difficult to resize the short cases. I need to resize once with the die screwed up some (which lengthens the distance to the shoulder) and then do it again adjusting the die down to try for the desired length of 4.243. I think this overworks the brass and some cases never do reach a suitable length and have to be pitched. Few can be sized to more than 4.241 while all these chambers can take a longer case.
Can someone explain what may be happening or what I may be doing wrong?
The bullet weight is 150 gr. I have had the same thing happen with Federal brass. I check all resized cases in a Lyman Case gauge.
For contrast, cases fired in an M-1 are 4.250 to the datum as measured with the Hornady gauge. It is a one step matter to size these down to 4.243.
Any help greatly appreciated.
