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<blockquote data-quote="swampratt" data-source="post: 3080450" data-attributes="member: 15054"><p>If you have IMR 4064 try it in the 243. Do not use mixed cases I found winchester cases worked best for me or Norma.</p><p></p><p>Now my last outing with the .243 I used 100gr Sierra #1540 with 40 gr H4350 Fully prepped winchester cases .241" ID no crimp, 210M primers.</p><p>2.640" OAL was where my gun liked them.</p><p>First cold bore shot hit 1" smack dab above bullseye the other 2 shots went left group measured .800" center to center.</p><p>Mossberg 100 atr. Stiffened factory stock and tweaked trigger.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3080450, member: 15054"] If you have IMR 4064 try it in the 243. Do not use mixed cases I found winchester cases worked best for me or Norma. Now my last outing with the .243 I used 100gr Sierra #1540 with 40 gr H4350 Fully prepped winchester cases .241" ID no crimp, 210M primers. 2.640" OAL was where my gun liked them. First cold bore shot hit 1" smack dab above bullseye the other 2 shots went left group measured .800" center to center. Mossberg 100 atr. Stiffened factory stock and tweaked trigger. [/QUOTE]
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