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I read on sites about fire forming, i am assuming this is done by firinf the round through your gun, and that it forms to your chamber. I am also assuming that as long as you are shooting it in the same gun you do not have to full size the cartrigde. Let me now if I got any of this correct.
Thanks in advance
 

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It varries with the cases you are using and how hot the reloads are. The case may get to the point where they are difficult to chamber when only neck sizeing. By using a Redding brand Competition Shellholder Set one can use a full length die with out over working a rifle case when the cases need to be full length resized
 

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I read on sites about fire forming, i am assuming this is done by firinf the round through your gun, and that it forms to your chamber. I am also assuming that as long as you are shooting it in the same gun you do not have to full size the cartrigde. Let me now if I got any of this correct.
Thanks in advance
First part you are correct.

Second part your just a little off. Take the 308 win for example. I have found out that you can only neck size about 5 times. Then you need to full length resize the brass. This will also vary by how hot you like your loads. I have some 223 loads pushing 3500 fps. These are for spectacular red misting varmints with 50gr V-Max bulelts. not a candidate for neck sizing.
 
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