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Rifles, Reloading, Optics, Equipment
Reloading
LANDS.......HOW FAR OFF TO START?
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<blockquote data-quote="Chawlston" data-source="post: 135130"><p>[ QUOTE ]</p><p>Any ideas on where to start an 180 gr Accubond in a 300win? does it like touching or is it a jumpper? help me out been of the bench awhile. </p><p></p><p>[/ QUOTE ]</p><p></p><p>If you get a set of ogive measuring adapters for your calipers, you can seat your bullets based on the ogive distance from the lands vice the oal of the loaded round. I found that if you are relying on oal for accurate ogive to land dimensional relationships, you are giving up some potential accuracy.</p><p></p><p>I make a dummy round and then set it into the lands ten times and then measure the ogive to base. I repeat this again and if it is the exact same with the same bullet, I have the starting point. Next load two at that length and then continue to load two at each different length. I use .010" increments. A .010" change in depth can mean the difference between shooting one-hole goups and shooting patterns. This is a type of ladder test I developed using seating depth with a constant powder charge. Works every time and seems less temperature sensitive during extreme changes. This way when you get some bullets off of a different machine makeing the exact same bullet, you can go right to the ogive vice figuring out the ogive to tip relationship for each and every box of bullets. Hope this helps. Note, this procedure has never failed to yield the most accurate groups for top loads in any caliber.</p><p></p><p>James</p></blockquote><p></p>
[QUOTE="Chawlston, post: 135130"] [ QUOTE ] Any ideas on where to start an 180 gr Accubond in a 300win? does it like touching or is it a jumpper? help me out been of the bench awhile. [/ QUOTE ] If you get a set of ogive measuring adapters for your calipers, you can seat your bullets based on the ogive distance from the lands vice the oal of the loaded round. I found that if you are relying on oal for accurate ogive to land dimensional relationships, you are giving up some potential accuracy. I make a dummy round and then set it into the lands ten times and then measure the ogive to base. I repeat this again and if it is the exact same with the same bullet, I have the starting point. Next load two at that length and then continue to load two at each different length. I use .010" increments. A .010" change in depth can mean the difference between shooting one-hole goups and shooting patterns. This is a type of ladder test I developed using seating depth with a constant powder charge. Works every time and seems less temperature sensitive during extreme changes. This way when you get some bullets off of a different machine makeing the exact same bullet, you can go right to the ogive vice figuring out the ogive to tip relationship for each and every box of bullets. Hope this helps. Note, this procedure has never failed to yield the most accurate groups for top loads in any caliber. James [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
LANDS.......HOW FAR OFF TO START?
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