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Rifles, Reloading, Optics, Equipment
Reloading
true freebore
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<blockquote data-quote="ballistx" data-source="post: 929102" data-attributes="member: 32156"><p>For me it is part of my engineering OCD. I have numerous centerfires that I reload for. I have multiple bullets for most. What I have done is create an Excel spreadsheet that lists the dimensions of each. In that way I can predict, and verify the outcome.</p><p> </p><p>I just found a new Marlin XL7 stainless in 25-06 at Sportsman's Warehouse for $359. I already have a Remington 700 ADL in 25-06. So, how do they compare?</p><p> </p><p>I will determine the COAL by inserting one of the bullets in the barrel up to the lands. I will hold it in place with a cleaning rod from the rear. Then I will measure the distance from the muzzle to the point with another rod. Then, I will measure the distance to the bolt face. By inserting those two numbers into the spreadsheet, I now have all the information regarding the jump, possible maximum length, comparative jump between the 2 (or more) rifles. I also have immediate measure of the amount of bullet held in the case.</p><p> </p><p>Each of my bullets is cataloged for the length, base to ogive, and tip to ogive. This is correlated with the OAL. </p><p> </p><p>I have 4 243's that shoot 5 different bullets. Hard to keep it straight.</p><p> </p><p>So, in all this, I need to identify what is the "rifle freebore" that will be used. What I am, and will be, using is the length from the front of the chamber neck (actually slightly ahead of that) (don't know what the tiny distance is called where the chamber drops from the outside of the neck to the inside of the neck) to the beginning of the lands. </p><p> </p><p>For my "cartridge freebore" I will use the distance from the front of my case to the lands. To me that is the actual freebore.</p><p> </p><p>For my true "bullet jump" I will go from the front of my actual case OAL to the lands, less the length of the bullet to the ogive that is outside the case. In other words, from the ogive to the lands.</p><p> </p><p>May not be real productive, but it has helped me understand the chamber, cartridge, barrel relationships and will help me understand the freebore relationship to accuracy with my individual rifles.</p></blockquote><p></p>
[QUOTE="ballistx, post: 929102, member: 32156"] For me it is part of my engineering OCD. I have numerous centerfires that I reload for. I have multiple bullets for most. What I have done is create an Excel spreadsheet that lists the dimensions of each. In that way I can predict, and verify the outcome. I just found a new Marlin XL7 stainless in 25-06 at Sportsman's Warehouse for $359. I already have a Remington 700 ADL in 25-06. So, how do they compare? I will determine the COAL by inserting one of the bullets in the barrel up to the lands. I will hold it in place with a cleaning rod from the rear. Then I will measure the distance from the muzzle to the point with another rod. Then, I will measure the distance to the bolt face. By inserting those two numbers into the spreadsheet, I now have all the information regarding the jump, possible maximum length, comparative jump between the 2 (or more) rifles. I also have immediate measure of the amount of bullet held in the case. Each of my bullets is cataloged for the length, base to ogive, and tip to ogive. This is correlated with the OAL. I have 4 243's that shoot 5 different bullets. Hard to keep it straight. So, in all this, I need to identify what is the "rifle freebore" that will be used. What I am, and will be, using is the length from the front of the chamber neck (actually slightly ahead of that) (don't know what the tiny distance is called where the chamber drops from the outside of the neck to the inside of the neck) to the beginning of the lands. For my "cartridge freebore" I will use the distance from the front of my case to the lands. To me that is the actual freebore. For my true "bullet jump" I will go from the front of my actual case OAL to the lands, less the length of the bullet to the ogive that is outside the case. In other words, from the ogive to the lands. May not be real productive, but it has helped me understand the chamber, cartridge, barrel relationships and will help me understand the freebore relationship to accuracy with my individual rifles. [/QUOTE]
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