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<blockquote data-quote="Mike Matteson" data-source="post: 3081049" data-attributes="member: 101791">Interesting. I have and shoot a 308 NM rifle (26&quot;). I shooting 3330fps with 75.6grs with H4350 and Fed-210 primers in Winchester brass. I also shot a 338WM using Fed-210 primers, Rem brass 200gr Nos BT AB @ 3230fps using 75.5grs of W760. (24&quot;) The load was develop in very warm weather. Not sure how it does in very cold weather for velocity. Both are under 1/2&quot; groups @ 100yds and hold very good at longer yardages. The 308NM is necked size with a 300WM neck sizing die. It only size about 2/3 of the neck. That do to die shape. I get 10 to 12 firing from the cases. Primer pocket are loose at that time. That how I stumble onto not bumping the shoulder back on the belted mag cases. With the 308NM I got a little better grouping with the neck sizing. The left the case partly fire formed into the neck area. That was due to configuration of the WM 300 and the 308NM cases and dies. At the time it would have taken over a year to get a 308NM neck sizing die. All case the neck were cut for thickness at that time also.At that time I only annealed once. That stopped the neck splitting. Not bumping the shoulder back stop the splitting at the belt. Before that I would lose cases with base separation in 3 firing.</blockquote>

[QUOTE="Mike Matteson, post: 3081049, member: 101791"] Interesting. I have and shoot a 308 NM rifle (26"). I shooting 3330fps with 75.6grs with H4350 and Fed-210 primers in Winchester brass. I also shot a 338WM using Fed-210 primers, Rem brass 200gr Nos BT AB @ 3230fps using 75.5grs of W760. (24") The load was develop in very warm weather. Not sure how it does in very cold weather for velocity. Both are under 1/2" groups @ 100yds and hold very good at longer yardages. The 308NM is necked size with a 300WM neck sizing die. It only size about 2/3 of the neck. That do to die shape. I get 10 to 12 firing from the cases. Primer pocket are loose at that time. That how I stumble onto not bumping the shoulder back on the belted mag cases. With the 308NM I got a little better grouping with the neck sizing. The left the case partly fire formed into the neck area. That was due to configuration of the WM 300 and the 308NM cases and dies. At the time it would have taken over a year to get a 308NM neck sizing die. All case the neck were cut for thickness at that time also. At that time I only annealed once. That stopped the neck splitting. Not bumping the shoulder back stop the splitting at the belt. Before that I would lose cases with base separation in 3 firing. [/QUOTE]

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