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Rifles, Reloading, Optics, Equipment
Reloading
Calculating OAL
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<blockquote data-quote="boomtube" data-source="post: 738008" data-attributes="member: 9215"><p>OAL causes lots of confusion new guys and quite a few old hands....that should not be. And there is NO way to "calculate OAL", chambers vary too much for that. There are three ways we can establish an OAL for rifles.</p><p> </p><p>First is the max length that will feed and function through the magazine OR go by factory length - that's the SAAMI standard length. </p><p> </p><p>Second is book OAL length and all that means is the length the guys who developed the listed data used in their rifle. Our's ain't theirs so ....</p><p> </p><p>Third, we can start somewhere off the lands and develop the best shooting lenght for our rigs. There's no need to be highly precise about where the lands are because it's not going to be exactly there anyway. Most factory rifles are going to shoot best with a bullet jump to the lands from about 20 thou to as much as five times that much. ONLY experiments on the range will tell you what works best with YOUR rig and YOUR load!</p><p> </p><p>A lot of us agonize over getting a specific amount of jump from seated bullet to lands contact and that demands a bullet comparitor/gauge that references off the bullet's ogive. Fact is, we can do quite well with our experiments by simply measureing the actual OAL unless the bullet noses are highly variable - most aren't that bad. There's a range of seating that will work well and it seems to run from 10 to 20 thou wide for most rifles so try to find where the 'good' range is and seat in the middle of it so small variations won't matter much, if at all.</p></blockquote><p></p>
[QUOTE="boomtube, post: 738008, member: 9215"] OAL causes lots of confusion new guys and quite a few old hands....that should not be. And there is NO way to "calculate OAL", chambers vary too much for that. There are three ways we can establish an OAL for rifles. First is the max length that will feed and function through the magazine OR go by factory length - that's the SAAMI standard length. Second is book OAL length and all that means is the length the guys who developed the listed data used in their rifle. Our's ain't theirs so .... Third, we can start somewhere off the lands and develop the best shooting lenght for our rigs. There's no need to be highly precise about where the lands are because it's not going to be exactly there anyway. Most factory rifles are going to shoot best with a bullet jump to the lands from about 20 thou to as much as five times that much. ONLY experiments on the range will tell you what works best with YOUR rig and YOUR load! A lot of us agonize over getting a specific amount of jump from seated bullet to lands contact and that demands a bullet comparitor/gauge that references off the bullet's ogive. Fact is, we can do quite well with our experiments by simply measureing the actual OAL unless the bullet noses are highly variable - most aren't that bad. There's a range of seating that will work well and it seems to run from 10 to 20 thou wide for most rifles so try to find where the 'good' range is and seat in the middle of it so small variations won't matter much, if at all. [/QUOTE]
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Calculating OAL
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