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Rifles, Reloading, Optics, Equipment
Gunsmithing
looks like gases leaking past shoulder?
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<blockquote data-quote="robert6715" data-source="post: 888251" data-attributes="member: 41629"><p>My factory Mark V Accumark shoots the 300 gr Berger into very small groups with 98.5 gr and 100.5 gr H1000. These are right at or above max loads depending on whos data you use. ALWAYS work up to these loads. </p><p></p><p>As you can see I am shooting 4.5 gr more powder with a 75gr heavier bullet. That alone should tell you that your loads are very light.</p><p></p><p>I have never loaded anything lighter than the 250's and they were a waste of my time IMO.</p><p></p><p>Load some 104gr loads and I bet your problem goes away. </p><p></p><p>I use a 45 cal cotton mop on a pistol rod to soak up solvent from my chamber, it fits tight and works great. A wet chamber will not allow the case to grip the chamber wall, so all force is put on the recoil lugs. Which is why you were having hard bolt lift with a light load. Also could be that the load is so light that the case is not expanding enough to grip the chamber walls at all, because it is surely not expanding enough to seal out the combustion gases.</p><p></p><p>Another BIG thing to consider with a 378 WBY based case is the primer. Federal desighned the 215 at the request of Roy Weatherby for the 378. All the load data I have seen says to use federal 215's.</p><p></p><p>I dont know where the Rem 9-1/2 stacks up in comparison to the federal 215.</p><p></p><p>Hope this all helps, and look forward to your results Rob</p></blockquote><p></p>
[QUOTE="robert6715, post: 888251, member: 41629"] My factory Mark V Accumark shoots the 300 gr Berger into very small groups with 98.5 gr and 100.5 gr H1000. These are right at or above max loads depending on whos data you use. ALWAYS work up to these loads. As you can see I am shooting 4.5 gr more powder with a 75gr heavier bullet. That alone should tell you that your loads are very light. I have never loaded anything lighter than the 250's and they were a waste of my time IMO. Load some 104gr loads and I bet your problem goes away. I use a 45 cal cotton mop on a pistol rod to soak up solvent from my chamber, it fits tight and works great. A wet chamber will not allow the case to grip the chamber wall, so all force is put on the recoil lugs. Which is why you were having hard bolt lift with a light load. Also could be that the load is so light that the case is not expanding enough to grip the chamber walls at all, because it is surely not expanding enough to seal out the combustion gases. Another BIG thing to consider with a 378 WBY based case is the primer. Federal desighned the 215 at the request of Roy Weatherby for the 378. All the load data I have seen says to use federal 215's. I dont know where the Rem 9-1/2 stacks up in comparison to the federal 215. Hope this all helps, and look forward to your results Rob [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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looks like gases leaking past shoulder?
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