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Interpeting Magnetospeed Data
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<blockquote data-quote="Bishop" data-source="post: 924381" data-attributes="member: 26163"><p>I use an rcbs Beam scale and throw each charge close, and trickle up from there on the beam scale.</p><p></p><p></p><p>I did not anneal the necks as these are virgin lapua brass, I trimmed them all to the same exact length, sized with a Redding type-s F/L bushing die. I ran it with the expander ball in the die on this batch because they were all virgin cases and i wanted to get rid of any dings in the case mouth etc. Now that i have all cases sized once and no dents in the neck I will not be using the expander ball anymore.</p><p></p><p>Barrel had 20+ shots to foul it before i started shooting through the chrony, and i followed the break in instructions included with the rifle when i bought it from Len here. I also shot it some today and only had a much lower ES and SD today, but I also had a smaller sample size, only 8 shots with the magnetospeed on the barrel. I had an ES of 15 for those 8 shots with most of them being within 5 fps. I had one round abnormally low fps and one round abnormally high when compared to the rest of them. </p><p></p><p>I did however shoot a .327 3 shot CtC group with it today off the bipod with this load at 100y, so the accuracy potential is there, i just need to get the ES down as low as I can.</p><p></p><p>I will mix all the varget together in a tub once i get enough saved up and then put it back into its containers to help eliminate the lot to lot difference once i get enough bought up to warrant going through the trouble.</p><p></p><p>@liltank you mentioned the last 3 shots really close, thats what I am seeing when im chronographing this gun, I will get a few shots that are right close within 5 fps or so and then BAM i get one wacky shot that is like 30 fps slower or faster. </p><p></p><p>I really wish i could find 5000 F210m primers but they are harder to find than powder for me atm. I might try some Rl-15 if I cant get the ES down with IMR-4064 but I have plenty of IMR to work with so I will give that some time first. Since I have nice velocity as well dropping a grain might be a good idea, I will give that a shot next and see what happens, although my observed accuracy nodes were at 42.5 g of imr-4064 and 44g of imr-4064 however the gun has not shot any worse than .5 moa with any load and seating depth I have tried so far, except 44.5 g of imr-4064 there was an immediate group opening when i was doing my initial load work up when i hit this powder charge, and a plain ejector mark on the brass. I am getting a very faint ejector mark at 44g right now with some primer flattening. So I suspect I may be fine just being satisfied with .5 moa and dropping my powder charge to see if I get better ES.</p><p></p><p>Heck of a problem to have i know, having a gun that shoots .5 moa at its worst. The ES is just driving me crazy though, its fine out to 600 now, but i suspect I would start having some major issues at 700-1000 with this load with bad vertical.</p><p></p><p>Thanks for the responses guys much appreciated!</p></blockquote><p></p>
[QUOTE="Bishop, post: 924381, member: 26163"] I use an rcbs Beam scale and throw each charge close, and trickle up from there on the beam scale. I did not anneal the necks as these are virgin lapua brass, I trimmed them all to the same exact length, sized with a Redding type-s F/L bushing die. I ran it with the expander ball in the die on this batch because they were all virgin cases and i wanted to get rid of any dings in the case mouth etc. Now that i have all cases sized once and no dents in the neck I will not be using the expander ball anymore. Barrel had 20+ shots to foul it before i started shooting through the chrony, and i followed the break in instructions included with the rifle when i bought it from Len here. I also shot it some today and only had a much lower ES and SD today, but I also had a smaller sample size, only 8 shots with the magnetospeed on the barrel. I had an ES of 15 for those 8 shots with most of them being within 5 fps. I had one round abnormally low fps and one round abnormally high when compared to the rest of them. I did however shoot a .327 3 shot CtC group with it today off the bipod with this load at 100y, so the accuracy potential is there, i just need to get the ES down as low as I can. I will mix all the varget together in a tub once i get enough saved up and then put it back into its containers to help eliminate the lot to lot difference once i get enough bought up to warrant going through the trouble. @liltank you mentioned the last 3 shots really close, thats what I am seeing when im chronographing this gun, I will get a few shots that are right close within 5 fps or so and then BAM i get one wacky shot that is like 30 fps slower or faster. I really wish i could find 5000 F210m primers but they are harder to find than powder for me atm. I might try some Rl-15 if I cant get the ES down with IMR-4064 but I have plenty of IMR to work with so I will give that some time first. Since I have nice velocity as well dropping a grain might be a good idea, I will give that a shot next and see what happens, although my observed accuracy nodes were at 42.5 g of imr-4064 and 44g of imr-4064 however the gun has not shot any worse than .5 moa with any load and seating depth I have tried so far, except 44.5 g of imr-4064 there was an immediate group opening when i was doing my initial load work up when i hit this powder charge, and a plain ejector mark on the brass. I am getting a very faint ejector mark at 44g right now with some primer flattening. So I suspect I may be fine just being satisfied with .5 moa and dropping my powder charge to see if I get better ES. Heck of a problem to have i know, having a gun that shoots .5 moa at its worst. The ES is just driving me crazy though, its fine out to 600 now, but i suspect I would start having some major issues at 700-1000 with this load with bad vertical. Thanks for the responses guys much appreciated! [/QUOTE]
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