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Rifles, Reloading, Optics, Equipment
Reloading
5 shot groups 3 together and 2 fliers?
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<blockquote data-quote="Mike6158" data-source="post: 2853925" data-attributes="member: 1039"><p>I had to dig out my notebook for this one. It sounds like you're familiar with Erik Cortina's videos. Per his stop chasing the lands video I measured jam with the same bullet I'm testing (150 gr Barnes TTSX). Jam for my Sendero is (well, was, it gets longer as I shoot it), 3.144" but that was measured with a Sinclair comparator. I use SAC comparators now. Sinclair measures .033" longer than the SAC comparators so 3.144 - .033 = 3.111 to jam with the Sinclair. Best group, was 2.588 using the SAC comparator. 0.523" of jump (ish, just because I have 3 decimal places that doesn't mean it's right <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> ). I started to name my Sendero Porn Star because her throat is so deep <img class="smilie smilie--emoji" loading="lazy" alt="👀" title="Eyes :eyes:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f440.png" data-shortname=":eyes:" /> I started testing powder at 2.580". I've been at this for a couple of months. The next group will be iteration #9 not counting the times I reshot a group. Sometimes I loaded 10 groups of 3. Sometimes I loaded 5 groups of 3 (counting the foulers). I'm on my 4th box of bullets.</p><p></p><p>Some of the early testing wasn't done with as much care as I've evolved to: like cleaning, annealing is now the first step. The AMP really makes that easy. FL case sizing without a sizing button. Then neck sizing with a bushing die, then using an expander mandrel for .002" of neck tension. I turn the case 1/4-ish turn with each step just to help with concentricity. Truth be told, I've checked concentricity and I don't really need to do the twisty step. The powder drops are weighed on a scale that's accurate to the 2nd decimal place. I let my scales warm up for 15m. Sometimes longer. I true up the tenths value as close as I can. I can usually make it 0.00 if that's what I need. I found out that my RCBS Chargemaster 1500 will occasionally drop 0.1gr high and show 0.0gr. That's a bigger change than some would believe. </p><p></p><p>I started out just trying to test a TTSX for stability out to 300 yards. The plastic tip in them looks "janky". Janky is a highly scientific measure of, yeah... I don't know. Plus it has all of the grooves cut into the base. So far, I've been able to get them to shoot better. </p><p></p><p>I'm worried about going hunting and having to wait for the proper position of the sun, position of the moon, wind speed, wind direction, atmospheric pressure, temperature, humidity, and tides before I can shoot. No wait, tides is for something else.</p></blockquote><p></p>
[QUOTE="Mike6158, post: 2853925, member: 1039"] I had to dig out my notebook for this one. It sounds like you're familiar with Erik Cortina's videos. Per his stop chasing the lands video I measured jam with the same bullet I'm testing (150 gr Barnes TTSX). Jam for my Sendero is (well, was, it gets longer as I shoot it), 3.144" but that was measured with a Sinclair comparator. I use SAC comparators now. Sinclair measures .033" longer than the SAC comparators so 3.144 - .033 = 3.111 to jam with the Sinclair. Best group, was 2.588 using the SAC comparator. 0.523" of jump (ish, just because I have 3 decimal places that doesn't mean it's right :D ). I started to name my Sendero Porn Star because her throat is so deep 👀 I started testing powder at 2.580". I've been at this for a couple of months. The next group will be iteration #9 not counting the times I reshot a group. Sometimes I loaded 10 groups of 3. Sometimes I loaded 5 groups of 3 (counting the foulers). I'm on my 4th box of bullets. Some of the early testing wasn't done with as much care as I've evolved to: like cleaning, annealing is now the first step. The AMP really makes that easy. FL case sizing without a sizing button. Then neck sizing with a bushing die, then using an expander mandrel for .002" of neck tension. I turn the case 1/4-ish turn with each step just to help with concentricity. Truth be told, I've checked concentricity and I don't really need to do the twisty step. The powder drops are weighed on a scale that's accurate to the 2nd decimal place. I let my scales warm up for 15m. Sometimes longer. I true up the tenths value as close as I can. I can usually make it 0.00 if that's what I need. I found out that my RCBS Chargemaster 1500 will occasionally drop 0.1gr high and show 0.0gr. That's a bigger change than some would believe. I started out just trying to test a TTSX for stability out to 300 yards. The plastic tip in them looks "janky". Janky is a highly scientific measure of, yeah... I don't know. Plus it has all of the grooves cut into the base. So far, I've been able to get them to shoot better. I'm worried about going hunting and having to wait for the proper position of the sun, position of the moon, wind speed, wind direction, atmospheric pressure, temperature, humidity, and tides before I can shoot. No wait, tides is for something else. [/QUOTE]
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5 shot groups 3 together and 2 fliers?
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