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Rifles, Reloading, Optics, Equipment
Reloading
OCW vs Ladder Test; the significance of the "scatter group"
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<blockquote data-quote="royinidaho" data-source="post: 98551" data-attributes="member: 2011"><p><strong>Re: OCW vs Ladder Test; the significance of the \"scatter group\"</strong></p><p></p><p>This must be important to me, as it is taking away from my stock sanding/bedding/magazine filling project. /ubbthreads/images/graemlins/ooo.gif</p><p></p><p>I really appreciate the level of effort that has gone into this OCW/Ladder Test thing.</p><p></p><p>I'm having a bit of a learning problem, though. Maybe 63 years of living is catching up to me. Had similar experience with Solid Geometry, so I don't think age is the problem. I'm just a knucle head /ubbthreads/images/graemlins/crazy.gif</p><p></p><p>First comment: So that's how segue is spelled? Never saw it in print before. /ubbthreads/images/graemlins/blush.gif /ubbthreads/images/graemlins/blush.gif</p><p></p><p>Dan, bear with me, OK? It's tough to get inside someone else's head through an LCD monitor.</p><p></p><p>RE: The 52gr SMK targets.</p><p></p><p>What was the reasoning behind selecting 41.8gr as the OCW?</p><p></p><p>All of the targets except #2 look pretty good. If I reshot target 1 and 2 loads in a round robin fashion and got the same results, I'd go with the 40.8 grain load.</p><p></p><p>If 41.2gr is the scatter group, I would want to avoid that load/velocity by all means.</p><p></p><p>Targets 3, 4 &amp; 5 are all pretty good. Targets 3 &amp; 4 show a bit of vertical stringing. Target 5 has a stronger horizonal stinging tendency.</p><p></p><p>If I reshot loads 3, 4 &amp; 5 and came up with the same results (a shift from vertical to horizonal stringing) I'd try halfway between #s 4&amp;5 If the result is a small bug hole group with no stringing up or across then that's what I go with.</p><p></p><p>What I seem to be gathering from the OCW process is that IF I pick 41.8gr as you did, I should never expect any groups larger than targets 3 &amp; 4, all things being equal. Is that the jist of it??</p><p></p><p>Now it gets tougher...... As this is where I am.</p><p></p><p>The 75gr Sierra loads w/4350. I didn't notice that the OCW was identified. I would pick halfway between 45.7 and 46.0 which would be 45.85gr (Wonder if the Chargemaster could be programed to that number of decimals /ubbthreads/images/graemlins/confused.gif Remember when I asked if OCW would work for an OCD? Yep, that's me /ubbthreads/images/graemlins/blush.gif /ubbthreads/images/graemlins/blush.gif)</p><p></p><p>With 45.8 gr of 4350, looking at the velocities, I would expect a group no larger that what's shown for the 45.7 and 46.0 gr loads with a velocity spread of say 3313-3218 or 105 FPS.</p><p></p><p>This is where my world is at the moment. I shoot on the order of less than 0.5 MOA at 200 yds (btw a lone bullet hole out of my rifle is larger than your small groups, ya gotta get in the big bore league /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/grin.gif) I missed my life size steel coyote more often than not at 700 yds until I tightened up the SD of the load. It was kind of like a tuning process within a tuning process.</p><p></p><p>I applogize for rambling but I think there is something I'm missing and being a bit obsessive I can't seem to let it go. (frownie face)</p><p></p><p>I am moving into a cartridge(s) that don't have the barrel life luxury of the 338 Win and don't want to waste barrel life doing load work up. (Besides being old, I'm po /ubbthreads/images/graemlins/grin.gif)</p></blockquote><p></p>
[QUOTE="royinidaho, post: 98551, member: 2011"] [b]Re: OCW vs Ladder Test; the significance of the \"scatter group\"[/b] This must be important to me, as it is taking away from my stock sanding/bedding/magazine filling project. [img]/ubbthreads/images/graemlins/ooo.gif[/img] I really appreciate the level of effort that has gone into this OCW/Ladder Test thing. I'm having a bit of a learning problem, though. Maybe 63 years of living is catching up to me. Had similar experience with Solid Geometry, so I don't think age is the problem. I'm just a knucle head [img]/ubbthreads/images/graemlins/crazy.gif[/img] First comment: So that's how segue is spelled? Never saw it in print before. [img]/ubbthreads/images/graemlins/blush.gif[/img] [img]/ubbthreads/images/graemlins/blush.gif[/img] Dan, bear with me, OK? It's tough to get inside someone else's head through an LCD monitor. RE: The 52gr SMK targets. What was the reasoning behind selecting 41.8gr as the OCW? All of the targets except #2 look pretty good. If I reshot target 1 and 2 loads in a round robin fashion and got the same results, I'd go with the 40.8 grain load. If 41.2gr is the scatter group, I would want to avoid that load/velocity by all means. Targets 3, 4 & 5 are all pretty good. Targets 3 & 4 show a bit of vertical stringing. Target 5 has a stronger horizonal stinging tendency. If I reshot loads 3, 4 & 5 and came up with the same results (a shift from vertical to horizonal stringing) I'd try halfway between #s 4&5 If the result is a small bug hole group with no stringing up or across then that's what I go with. What I seem to be gathering from the OCW process is that IF I pick 41.8gr as you did, I should never expect any groups larger than targets 3 & 4, all things being equal. Is that the jist of it?? Now it gets tougher...... As this is where I am. The 75gr Sierra loads w/4350. I didn't notice that the OCW was identified. I would pick halfway between 45.7 and 46.0 which would be 45.85gr (Wonder if the Chargemaster could be programed to that number of decimals [img]/ubbthreads/images/graemlins/confused.gif[/img] Remember when I asked if OCW would work for an OCD? Yep, that's me [img]/ubbthreads/images/graemlins/blush.gif[/img] [img]/ubbthreads/images/graemlins/blush.gif[/img]) With 45.8 gr of 4350, looking at the velocities, I would expect a group no larger that what's shown for the 45.7 and 46.0 gr loads with a velocity spread of say 3313-3218 or 105 FPS. This is where my world is at the moment. I shoot on the order of less than 0.5 MOA at 200 yds (btw a lone bullet hole out of my rifle is larger than your small groups, ya gotta get in the big bore league [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]) I missed my life size steel coyote more often than not at 700 yds until I tightened up the SD of the load. It was kind of like a tuning process within a tuning process. I applogize for rambling but I think there is something I'm missing and being a bit obsessive I can't seem to let it go. (frownie face) I am moving into a cartridge(s) that don't have the barrel life luxury of the 338 Win and don't want to waste barrel life doing load work up. (Besides being old, I'm po [img]/ubbthreads/images/graemlins/grin.gif[/img]) [/QUOTE]
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OCW vs Ladder Test; the significance of the "scatter group"
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