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Rifles, Reloading, Optics, Equipment
Reloading
338 lapua priming tool
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<blockquote data-quote="QuietTexan" data-source="post: 2282450" data-attributes="member: 116181"><p>I used an RCBS for my 338LM without issues, but it was a chore to prime and my hands just weren't up to doing a lot of volume. To fix that.... my CPS landed on the doorstep this morning!</p><p></p><p></p><p>Not a problem so much as improving fit and consistency. As with so many things in loading it's something that makes an impact on a load, so the basic strategy is to maximize consistency to reduce the amount of variance it adds to a load, then (once appropriate) tune it.</p><p></p><p>It's a pretty fine detail so I would say that it's only really tunable after several other processes (seating depth, neck fit, brass prep, charge weight, etc) have been made so consistent that a change in primer seating is detectable on paper or the chrono. If the charge weight is varying by +/-0.2gn on every drop, then the consistency or tuning of primer seating is going to be lost in the noise of 20+fps SDs from the charge. If you're running consistent single-digit SD this it's something that will show up like this guy did:</p><p>[URL unfurl="true"]https://www.reloadingallday.com/post/does-primer-seating-depth-matter[/URL]</p><p></p><p>I'm working very hard to get to the point where everything else is good enough that I can tune primers. I set a series of goals for my loading: sub-10 SD from 10 shot string, sub 10-SD from a 20-shot string, then SD of ~5 from 20 shots. Maybe one day I'll get a 36-shot 5.5 SD. The first step was actually pretty easy, only took upgrading brass and my scale and got there with a factory rifle. I'm probably already hitting the second goal, but I haven't shot a 20+ round string since my last set of changes to be sure. Too busy making my hunting ammo for this year currently. I'm thinking the third goal is going to be a bit tougher to get to, but I'm adding annealing, primer seating, and a non-factory chamber to the mix to get there.</p><p></p><p>[ATTACH=full]296810[/ATTACH]</p><p>[URL unfurl="true"]https://precisionrifleblog.com/2020/12/05/muzzle-velocity-statistics-for-shooters/[/URL]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2282450, member: 116181"] I used an RCBS for my 338LM without issues, but it was a chore to prime and my hands just weren't up to doing a lot of volume. To fix that.... my CPS landed on the doorstep this morning! Not a problem so much as improving fit and consistency. As with so many things in loading it's something that makes an impact on a load, so the basic strategy is to maximize consistency to reduce the amount of variance it adds to a load, then (once appropriate) tune it. It's a pretty fine detail so I would say that it's only really tunable after several other processes (seating depth, neck fit, brass prep, charge weight, etc) have been made so consistent that a change in primer seating is detectable on paper or the chrono. If the charge weight is varying by +/-0.2gn on every drop, then the consistency or tuning of primer seating is going to be lost in the noise of 20+fps SDs from the charge. If you're running consistent single-digit SD this it's something that will show up like this guy did: [URL unfurl="true"]https://www.reloadingallday.com/post/does-primer-seating-depth-matter[/URL] I'm working very hard to get to the point where everything else is good enough that I can tune primers. I set a series of goals for my loading: sub-10 SD from 10 shot string, sub 10-SD from a 20-shot string, then SD of ~5 from 20 shots. Maybe one day I'll get a 36-shot 5.5 SD. The first step was actually pretty easy, only took upgrading brass and my scale and got there with a factory rifle. I'm probably already hitting the second goal, but I haven't shot a 20+ round string since my last set of changes to be sure. Too busy making my hunting ammo for this year currently. I'm thinking the third goal is going to be a bit tougher to get to, but I'm adding annealing, primer seating, and a non-factory chamber to the mix to get there. [ATTACH type="full" alt="LabRadar-Reading-for-5.5-SD-Ammo-Over-36-Shots-1-300x270.jpg"]296810[/ATTACH] [URL unfurl="true"]https://precisionrifleblog.com/2020/12/05/muzzle-velocity-statistics-for-shooters/[/URL] [/QUOTE]
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338 lapua priming tool
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