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Posted: 9/30/2013 5:42:43 PM EDT
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So I'm looking at reloading for a .308 gas gun. I would like to improve accuracy beyond what Federal Gold Medal Match gives me. I'm doing pretty well on rounding up the equipment and working up to the proper load, but am having a little trouble figuring out what to do for the full length sizing of the brass. Here is my plan
Lapua 308 Brass Full Length Resize (What die would be best for this?) Trim cases to same overall length chamfer Expand necks with K&M neck expander tool Turn the necks with K&M neck turner? Size necks with neck sizing die .... the rest is pretty straight forward I know since I'm using a semi-auto I need to full length resize every time, but I want to minimize overworking the brass and I also want to get better neck concentricity and that is why I would prefer to use the K&N vs. the usual expander ball in a resizing die. I was just going to get a Dillon 308 die set and just remove the ball, but is there something else that would suit me better? Also, are the better seating dies than the std. Dillon seating die that might help minimize runout? It is also my understanding that I only need to turn the necks once when the case are new correct? After that every time I reload I just do a full length resize, trim length, chamfer, and expand? |
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The techniques you are planning are better suited to bolt actions then for a "Gas" gun.
The best way I have found to minimize Run-out is to FL size the body only with the Redding "Body" die. Then size the neck with the Lee Collet die. Very concentric brass with little effort and no neck turning. Then seat with a good Competition seating die. I happen to like the Forster BR seating dies. |
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Lapua brass is a waste of money for a gas gun. Use the brass you have from the fgmm. You will tear up the case rim and chew up the brass with a semi. If you want good brass for a semi, look on the EE for someone selling
LC brass. It will stand up better to the hell you will put it through. Make sure you get a Lee factory crimp die, or your seating die crimps. The crimp is needed so you don't get bullet setback in a semi. |
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"Better than FGMM" use in gas guns is not a goal I would subscribe to. Maybe get a .308 sniper rated bolt gun (sst bull bbl, etc.) to start a quest of "better than FGMM".
[eta] I was not able to size the 1X cases small enough, even with my RCBS SB FL die, because the FGMM case has a slightly smaller diameter along the body. Federal makes their FGMM to work in all guns including those with tight chambers. |
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