Core seating punch for J4 jackets?

P

P.Ericson

Member
Hi guys,

I have only been using one lot of Sierra jackets before, but now have an order in for J4 jackets. I have been using about a .2150" punch for a 67gr 6mm bullet. About what sizes are used with .790" and .825" 6mm J4 jackets?

I have a lot of punches between .209 and .216, but nothing bigger and I don't want to be sitting here without big enough punches when the jackets arrive... Does one ever need fatter punches than .2160" for 68grs on the .825" jacket or 66grs .790"??

Regards,
Peter
 
I have been using punches 0.2100 and 0.2105 for the lot of J4's I have to make 68grain flat base bullets on 0.825 jackets. I haven't made bullets on 0.790 jackets for quite awhile as I use 0.825 jackets to make 66 grain boat tails.
 
J4 Jackets

I have used both 0.825 & 0,790 J4 jackets. My core seating punches ran from 0.0209 to 0.0212
 
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