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Rifles, Reloading, Optics, Equipment
Reloading
Finding Jam - I thought I knew how
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<blockquote data-quote="25WSM" data-source="post: 2073778" data-attributes="member: 38048"><p>What most people don't realize is seating depth tuning is mainly a function of timing the length of time the bullet is in the barrel. Once this is established that seating depth will work for a long time. Even after your barrel throat starts to erode there will be a time when the erosion slows your load down because of less pressure and you can fix your accuracy by moving the bullet forward" chasing the lands" or by putting in a few 10ths more powder. Pretty much all tuning is just getting the bullet to release at the right time of the barrel swing. Doing a powder charge ladder will give you a course adjustment of your node and then the seating can fine tune the timing even more. So I go through a lot of barrels shooting BR and once you find a good time that is wide I don't change my load till it stops shooting. I do use a tuner on my BR guns but not to find the most accurate load. I use the tuner to keep my load in tune through different temperature shifts. Moving your seating depth and moving your tuner are accomplishing the same thing but in a different way. If you move your bullet out longer it will have a shorter amount of time in the barrel. So if your barrel swing is past TDC or BDC moving your bullet forward will get the bullet out in less time and get you closer to your tune. Moving your tuner out makes the barrel swing slower and your bullet will get closer to your node point. Tuning is simple and is just for the most part a timing of bullet release. The other factors of tuning is how consistent your cartridge combustion is. If it's inconsistent then it affects the timing. And of course some barrels just hate certain bullets and no amount of timing is going to make them shoot. That sucks when the bullet you want to use doesn't play well with your new barrel. PRS and F-class guys do have to chase rifling because the shear volume of shooting they do over the course of a match. Most hunting rifles won't get the amount of shots a PRS gun gets in one weekend in it's entire life.</p><p>Shep</p></blockquote><p></p>
[QUOTE="25WSM, post: 2073778, member: 38048"] What most people don't realize is seating depth tuning is mainly a function of timing the length of time the bullet is in the barrel. Once this is established that seating depth will work for a long time. Even after your barrel throat starts to erode there will be a time when the erosion slows your load down because of less pressure and you can fix your accuracy by moving the bullet forward" chasing the lands" or by putting in a few 10ths more powder. Pretty much all tuning is just getting the bullet to release at the right time of the barrel swing. Doing a powder charge ladder will give you a course adjustment of your node and then the seating can fine tune the timing even more. So I go through a lot of barrels shooting BR and once you find a good time that is wide I don't change my load till it stops shooting. I do use a tuner on my BR guns but not to find the most accurate load. I use the tuner to keep my load in tune through different temperature shifts. Moving your seating depth and moving your tuner are accomplishing the same thing but in a different way. If you move your bullet out longer it will have a shorter amount of time in the barrel. So if your barrel swing is past TDC or BDC moving your bullet forward will get the bullet out in less time and get you closer to your tune. Moving your tuner out makes the barrel swing slower and your bullet will get closer to your node point. Tuning is simple and is just for the most part a timing of bullet release. The other factors of tuning is how consistent your cartridge combustion is. If it's inconsistent then it affects the timing. And of course some barrels just hate certain bullets and no amount of timing is going to make them shoot. That sucks when the bullet you want to use doesn't play well with your new barrel. PRS and F-class guys do have to chase rifling because the shear volume of shooting they do over the course of a match. Most hunting rifles won't get the amount of shots a PRS gun gets in one weekend in it's entire life. Shep [/QUOTE]
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Finding Jam - I thought I knew how
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