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Long Range Hunting & Shooting
160 Accubond and H1000
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<blockquote data-quote="Shortmagman" data-source="post: 610132" data-attributes="member: 10723"><p>Sean,</p><p></p><p>I own a Ruger Mark II in 7mm Rem mag. and I have been reloading it for almost 15 years. Here are some of the things that I have learned during that time.</p><p>1) Most of the newer manual's are very conservative with data for the 7mm Rem Mag.. I have an older Hodgdon Manual that lists 5-6 grains more of H1000 with a 160 grain bullet than any of the recent data. Following this manual I have loaded my gun with 70-72 grains of H1000 and I have gotten 3000 ft +/sec.. However this is way over the 66.0 grains that you will find on the Hodgdon web site. I feel uncomfortable doing this. I don't know why the newer manual's are so conservative but I have read that the chambers in the 7mm Rem Mag. differ greatly and that is given as the reason.</p><p></p><p>2) You can use other powders at the max load and come close to 3000 ft/sec with a 160 grains bullet. On the Hodgdon web site they show that 69.5 grains of Retumbo produced 2915 ft/sec.. Winchester's Supreme 780 gave 2948 ft/sec.. I have switched to RL-22 at just above the data from Alliant and I have gotten just short of 3000 ft/sec.. According to the Alliant web site 70 grains of RL-25 gives 3012 ft/sec from a 24 inch barrel.</p><p></p><p></p><p>You have a few choices. You can go up on the H1000 and watch for pressure signs, or you can switch to another powder and work up your loads.</p></blockquote><p></p>
[QUOTE="Shortmagman, post: 610132, member: 10723"] Sean, I own a Ruger Mark II in 7mm Rem mag. and I have been reloading it for almost 15 years. Here are some of the things that I have learned during that time. 1) Most of the newer manual's are very conservative with data for the 7mm Rem Mag.. I have an older Hodgdon Manual that lists 5-6 grains more of H1000 with a 160 grain bullet than any of the recent data. Following this manual I have loaded my gun with 70-72 grains of H1000 and I have gotten 3000 ft +/sec.. However this is way over the 66.0 grains that you will find on the Hodgdon web site. I feel uncomfortable doing this. I don't know why the newer manual's are so conservative but I have read that the chambers in the 7mm Rem Mag. differ greatly and that is given as the reason. 2) You can use other powders at the max load and come close to 3000 ft/sec with a 160 grains bullet. On the Hodgdon web site they show that 69.5 grains of Retumbo produced 2915 ft/sec.. Winchester's Supreme 780 gave 2948 ft/sec.. I have switched to RL-22 at just above the data from Alliant and I have gotten just short of 3000 ft/sec.. According to the Alliant web site 70 grains of RL-25 gives 3012 ft/sec from a 24 inch barrel. You have a few choices. You can go up on the H1000 and watch for pressure signs, or you can switch to another powder and work up your loads. [/QUOTE]
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