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Rifles, Reloading, Optics, Equipment
Reloading
working up a hot load question
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<blockquote data-quote="Lefty7mmstw" data-source="post: 838762" data-attributes="member: 48043"><p>Mostly different guy behind the rifle or better pressure measuring. Component variations account for some charge spread too. I'm seeing fewer dangerous combo's these days than in older manuals though.</p><p>There's still a good amount of hotter stuff out there . Check out Lyman's data for a 140 gr. in the 7stw with dang near any powder, but especially rl22. I had rather stout pressures at 77 grains with a 140 in my rifle, they go to 82 grains with a 140, or exactly what charge I use with rl25. Hell, hornady stops at 74.1 grains rl22 with a 140; Tha's a lot more spread than different bullet constructions will produce. Both are current manuals.</p><p> </p><p>Was the drop for your roy in manual #7?? Both # 4 and #6 show 83gr. top end for your roy combo. </p><p>Btw., the roy rounds did come in under saami guidelines in '96 if I remember correctly, and saami won't let cal's over 65Kpsi currently. I know I've seen Lazz. stuff over that and the lapua improved runs a bit over 65kpsi if I'm not mistaken. It is a good sensible top end though as you aren't beating the snot out of everything and you have a bit of headroom for temp change or a bit of dirt in the barrel, etc..</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 838762, member: 48043"] Mostly different guy behind the rifle or better pressure measuring. Component variations account for some charge spread too. I'm seeing fewer dangerous combo's these days than in older manuals though. There's still a good amount of hotter stuff out there . Check out Lyman's data for a 140 gr. in the 7stw with dang near any powder, but especially rl22. I had rather stout pressures at 77 grains with a 140 in my rifle, they go to 82 grains with a 140, or exactly what charge I use with rl25. Hell, hornady stops at 74.1 grains rl22 with a 140; Tha's a lot more spread than different bullet constructions will produce. Both are current manuals. Was the drop for your roy in manual #7?? Both # 4 and #6 show 83gr. top end for your roy combo. Btw., the roy rounds did come in under saami guidelines in '96 if I remember correctly, and saami won't let cal's over 65Kpsi currently. I know I've seen Lazz. stuff over that and the lapua improved runs a bit over 65kpsi if I'm not mistaken. It is a good sensible top end though as you aren't beating the snot out of everything and you have a bit of headroom for temp change or a bit of dirt in the barrel, etc.. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
working up a hot load question
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