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Rifles, Reloading, Optics, Equipment
Reloading
Reverse engineer .300 Win Mag Berger factory match grade 215 hybrid OTM ammo
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<blockquote data-quote="Okanogan" data-source="post: 1880978" data-attributes="member: 90397"><p>If the factory Berger 215 ammo shoots well in your rifle, then you should have two pretty good pieces of information available to help you in your quest. Measuring the CTBO / COAL will give you a reasonable starting point for seating depth testing. You may find tweaking it a little will help improve your groups even more.</p><p>If you have a good chronograph then it will also give you a decent velocity starting point to work toward in your rifle. The factory ABM in my 300 WMs shot just a little below 2900 fps. I can fairly easily get around 2850 out of H1000 or RL26 with both my 300 WMs and 215s without showing pressure signs.</p><p>For what it is worth, factory ABM ammo doesn't shoot well in my lighter barreled rifle but it does well in my heavier barreled rifle. In the lighter rifle, I had to slow the loads down to around 2800 fps to get the harmonics to work well.</p><p></p><p>I tend to agree with earlier posts that suggest giving up on trying to match the same powder that Berger used. I asked their tech support a similar question once and was told most powders are blended. In the end you just want similar results and with the factory ammo as a starting point you should be able to get reasonably close even if you struggle to find something that will give you those last few fps.</p></blockquote><p></p>
[QUOTE="Okanogan, post: 1880978, member: 90397"] If the factory Berger 215 ammo shoots well in your rifle, then you should have two pretty good pieces of information available to help you in your quest. Measuring the CTBO / COAL will give you a reasonable starting point for seating depth testing. You may find tweaking it a little will help improve your groups even more. If you have a good chronograph then it will also give you a decent velocity starting point to work toward in your rifle. The factory ABM in my 300 WMs shot just a little below 2900 fps. I can fairly easily get around 2850 out of H1000 or RL26 with both my 300 WMs and 215s without showing pressure signs. For what it is worth, factory ABM ammo doesn't shoot well in my lighter barreled rifle but it does well in my heavier barreled rifle. In the lighter rifle, I had to slow the loads down to around 2800 fps to get the harmonics to work well. I tend to agree with earlier posts that suggest giving up on trying to match the same powder that Berger used. I asked their tech support a similar question once and was told most powders are blended. In the end you just want similar results and with the factory ammo as a starting point you should be able to get reasonably close even if you struggle to find something that will give you those last few fps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Reverse engineer .300 Win Mag Berger factory match grade 215 hybrid OTM ammo
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