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Rifles, Reloading, Optics, Equipment
Reloading
How do I find the lands?
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<blockquote data-quote="ken snyder" data-source="post: 542160" data-attributes="member: 26019"><p>brubo, you arent missing with your observation. measuring bullet cartridge length from the meplat is for magazine length. The actual jump to the lands is measured from the place on the bullet that the major diameter of the bullet starts at. Different bullets have different shapes and tapers so measurements from the tip are just magazine length. Bullets right out of the same box will also have up to .015" variation in ogive length measured from major diameter to meplat. As rscott pointed out it is about" finding the correct seating depth that your rifle & load combination will shoot". I think there may be dozens of lengths that any particular load and rifle will like each other. Most of the time a handloader will not have any control over the actual jump because most seaters seat the bullet from the meplat with no consideration for the actual jump variations and are forced to find a happy average. Some shooters will final seat the bullets using a hand type seater that uses a seating cup that is long enough and has an inside diameter large enough that the bullet is seated from just in front of the major diameter which eliminates all jump variations as much as what is humanly possible. It is about jump or lack of jump, a good number or an average number. I feel that it is all about actual and consistant jump but at the same time admit that most handloaders are able to get averaged jumps to work very well. However I am way too lazy to work at finding an average so I always use consistant jump measuring and seating. A push feed tactic that works extremely well first time and every time. leaving only consistant velocity to play with.</p></blockquote><p></p>
[QUOTE="ken snyder, post: 542160, member: 26019"] brubo, you arent missing with your observation. measuring bullet cartridge length from the meplat is for magazine length. The actual jump to the lands is measured from the place on the bullet that the major diameter of the bullet starts at. Different bullets have different shapes and tapers so measurements from the tip are just magazine length. Bullets right out of the same box will also have up to .015" variation in ogive length measured from major diameter to meplat. As rscott pointed out it is about" finding the correct seating depth that your rifle & load combination will shoot". I think there may be dozens of lengths that any particular load and rifle will like each other. Most of the time a handloader will not have any control over the actual jump because most seaters seat the bullet from the meplat with no consideration for the actual jump variations and are forced to find a happy average. Some shooters will final seat the bullets using a hand type seater that uses a seating cup that is long enough and has an inside diameter large enough that the bullet is seated from just in front of the major diameter which eliminates all jump variations as much as what is humanly possible. It is about jump or lack of jump, a good number or an average number. I feel that it is all about actual and consistant jump but at the same time admit that most handloaders are able to get averaged jumps to work very well. However I am way too lazy to work at finding an average so I always use consistant jump measuring and seating. A push feed tactic that works extremely well first time and every time. leaving only consistant velocity to play with. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How do I find the lands?
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