cgculber 6 Posted December 26, 2013 Report Share Posted December 26, 2013 Hello all, I'm reloading a 7mm rem mag cartridge using the Lee single stage press given to me by my step-dad last year. It works pretty well with my 9mm dies but for some reason I can't figure out how to use the 7mm seating die properly. I can seat a 139 gr bullet with the OAL spot on, but the problem is that I can "wiggle" the bullet just a hair. I can't remove the bullet (it's seated and the length is correct) but I can wiggle it and even twist it around. I found another guy (on another forum http://thefiringline.com/forums/archive/index.php?t-397171.html ) who was having the same problem and someone recommended that he "polish down the mandrel on the collet die" to properly resize the case neck. I suppose he was suggesting that the case neck was too wide a diameter? Anyone know what I'm doing wrong? I appreciate the help in advance and MERRY CHRISTMAS! Quote Link to post Share on other sites
jdtravers 637 Posted December 26, 2013 Report Share Posted December 26, 2013 What Over All Length (OAL) are you loading to? For a 139 gain, it should be at 3.290 Are you full length resizing or neck sizing? Is it new or fire formed brass? Quote Link to post Share on other sites
cgculber 6 Posted December 26, 2013 Author Report Share Posted December 26, 2013 3.29 sounds about right. I'm full length resizing. The seating die was already set when I started using it, so I should probably remeasure everything. The brass is fire formed and have been reloaded maybe 5 - 10 times already. I should point out that this problem is a hit or miss. Sometimes they seat no problem but today I did four and all four had the "wiggle." Quote Link to post Share on other sites
jdtravers 637 Posted December 26, 2013 Report Share Posted December 26, 2013 Try this, just out of curiosity. With fire formed brass, take the expander ball out/off of the decapping pin, so it will only punch out the primer and there won't be an expander ball to size the opening/inside of the neck. You don't need the expander ball with fire formed brass out of the gun/chamber you are loading for. It will only size the neck tension. See how the bullet loads. If it still doesn't work, try a different brand of bullet like a Berger. Jack Quote Link to post Share on other sites
cgculber 6 Posted December 26, 2013 Author Report Share Posted December 26, 2013 Jack, That seems to be the problem. I appreciate your help, thank you! Quote Link to post Share on other sites
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