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Long Range Hunting & Shooting
270Win
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<blockquote data-quote="Shootin4fun" data-source="post: 808459" data-attributes="member: 28741"><p>Does anyone use Win760 powder in their 270 hand loads? I started out with it and Hdy 130gr SPs and eventually developed a decent load that shoots between cloverleaves and 1.5 MOA 4 shot groups. The load is 52.0gr W760, GM210 OAL 3.280. The equipment is a Leopold 3-9 X 40 on a Browning BAR 22" barrel.</p><p> </p><p>But with that mix I only get velocities up to about 2780fps, more powder and the groups become inconsistent and pressure builds. </p><p> </p><p>H4350 has not solved the velocity problem and not increased accuracy. I developed a 130gr TSX load of 54.0gr 4350, and that yields about 2860fps. Seating the bullets .010 deeper and its 2930fps but excessive pressure signs are happening; flattened primers and headstamp of ejector pin. One Winchester case even ruptured and it had only been reloaded a few times!</p><p> </p><p>(I'll add that the 110gr Sierra Pro Hunters hold consistent sub MOA with the W760 - 56.7gr, going out at about 3200fps.)</p><p> </p><p>For these lead free TSX hunting bullets (soon trying 130gr GMX) I would like to boost the velocity another 100 - 200 fps without the excessive pressure. </p><p> </p><p>Any suggestions based on your experiences?</p><p> </p><p>I have not tried anything slower but I have some RL22, IMR4831, (and H1000 which I guess is too slow). </p><p> </p><p>Thanks in advance, guys.</p></blockquote><p></p>
[QUOTE="Shootin4fun, post: 808459, member: 28741"] Does anyone use Win760 powder in their 270 hand loads? I started out with it and Hdy 130gr SPs and eventually developed a decent load that shoots between cloverleaves and 1.5 MOA 4 shot groups. The load is 52.0gr W760, GM210 OAL 3.280. The equipment is a Leopold 3-9 X 40 on a Browning BAR 22" barrel. But with that mix I only get velocities up to about 2780fps, more powder and the groups become inconsistent and pressure builds. H4350 has not solved the velocity problem and not increased accuracy. I developed a 130gr TSX load of 54.0gr 4350, and that yields about 2860fps. Seating the bullets .010 deeper and its 2930fps but excessive pressure signs are happening; flattened primers and headstamp of ejector pin. One Winchester case even ruptured and it had only been reloaded a few times! (I'll add that the 110gr Sierra Pro Hunters hold consistent sub MOA with the W760 - 56.7gr, going out at about 3200fps.) For these lead free TSX hunting bullets (soon trying 130gr GMX) I would like to boost the velocity another 100 - 200 fps without the excessive pressure. Any suggestions based on your experiences? I have not tried anything slower but I have some RL22, IMR4831, (and H1000 which I guess is too slow). Thanks in advance, guys. [/QUOTE]
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