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7mm Rem Accumark Load Testing
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<blockquote data-quote="Autorotate19" data-source="post: 372416" data-attributes="member: 20956"><p>I went to the range today to try out Jerry Teo's method of load development. I did everything the same as he describes except I shot three shot groups instead of two. I started at 69.5grs and worked up to 73.5grs with retumbo. I used once fired winchester brass, rem 9.5 primers, loaded to a coal of 3.668 which is magazine length. It puts me .069 off the lands. I used berger 168 vlds. I shot at 200 yards with about two minutes between shots in groups and then let the barrel get cold in between loads. </p><p></p><p>69.5grs - 3.9"</p><p>70.grs- 2.7"</p><p>70.5grs- .9"</p><p>71.0grs- 1.3"</p><p>71.5grs- 5"</p><p>72.0grs- 5.4"</p><p>72.5grs- 2.4"</p><p>73.0grs- 3.1"</p><p>73.5"grs- 1.8"</p><p></p><p>At 71grs and 73.5 grs two were touching with the third opening them up. At 73.5 grs I had no pressure signs whatsoever. I think one node is at 70.5 and the other one is somewhere above 73.5 grs. I think Im going to bump it up and see if they tighten up before I get too much pressure. </p><p></p><p>So those of you that use a method of load testing similar to this, is it normal that in .5grs of powder difference a group can go from 1" to 5"? Seemed kinda weird that it would open up that much so suddenly. I used a lead sled to keep human error to a minimum. Also do you guys have a lot of success finding a good long range load with this kinda method? </p><p></p><p>O and can anyone give me an idea of what kind of velocity Im getting at 70.5grs with a 26" barrel. Thanks</p></blockquote><p></p>
[QUOTE="Autorotate19, post: 372416, member: 20956"] I went to the range today to try out Jerry Teo's method of load development. I did everything the same as he describes except I shot three shot groups instead of two. I started at 69.5grs and worked up to 73.5grs with retumbo. I used once fired winchester brass, rem 9.5 primers, loaded to a coal of 3.668 which is magazine length. It puts me .069 off the lands. I used berger 168 vlds. I shot at 200 yards with about two minutes between shots in groups and then let the barrel get cold in between loads. 69.5grs - 3.9" 70.grs- 2.7" 70.5grs- .9" 71.0grs- 1.3" 71.5grs- 5" 72.0grs- 5.4" 72.5grs- 2.4" 73.0grs- 3.1" 73.5"grs- 1.8" At 71grs and 73.5 grs two were touching with the third opening them up. At 73.5 grs I had no pressure signs whatsoever. I think one node is at 70.5 and the other one is somewhere above 73.5 grs. I think Im going to bump it up and see if they tighten up before I get too much pressure. So those of you that use a method of load testing similar to this, is it normal that in .5grs of powder difference a group can go from 1" to 5"? Seemed kinda weird that it would open up that much so suddenly. I used a lead sled to keep human error to a minimum. Also do you guys have a lot of success finding a good long range load with this kinda method? O and can anyone give me an idea of what kind of velocity Im getting at 70.5grs with a 26" barrel. Thanks [/QUOTE]
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