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<blockquote data-quote="7magcreedmoor" data-source="post: 971594" data-attributes="member: 48559"><p>As I understand the concept, measure the length with the bullet just starting to resist going into the neck, then go one caliber (.308 in this instance) deeper. This means you wouldn't count the boat tail in the distance we are talking about. Some of my rifle/load combos end up with a little more than one caliber into the neck, and some with slightly less. I wouldn't be comfortable with less than half, but some folks might run with that and have no problems. I have a rifle in which my limiting factor is the magazine box length, and had to have the custom barrel throated to match a dummy round I sent along that had been seated as I just described. It worked out very well. You could begin with this experiment: just lightly press a bullet into the neck, then attempt to chamber it in your rifle (no primer or powder in this case, of course). If you are able to stick the bullet into the lands a little, then a one caliber seating depth would give you a 0.308 jump, which is a bit long, but might not shoot too bad. As long as the bullet will be held with decent neck tension, having a long COAL is neither here nor there. You will find that it will take slightly more charge weight to get back to the same velocity you originally had. Powder charges in manuals are for specific COALs, and when I find the ideal COAL for my rifle, I often will end up with a load that is slightly above the maximum listed, but remember we are filling a slightly larger combustion chamber when we load longer COALs. ALWAYS TEST FOR SIGNS OF EXCESSIVE PRESSURE BEFORE SETTLING ON A LOAD!</p></blockquote><p></p>
[QUOTE="7magcreedmoor, post: 971594, member: 48559"] As I understand the concept, measure the length with the bullet just starting to resist going into the neck, then go one caliber (.308 in this instance) deeper. This means you wouldn't count the boat tail in the distance we are talking about. Some of my rifle/load combos end up with a little more than one caliber into the neck, and some with slightly less. I wouldn't be comfortable with less than half, but some folks might run with that and have no problems. I have a rifle in which my limiting factor is the magazine box length, and had to have the custom barrel throated to match a dummy round I sent along that had been seated as I just described. It worked out very well. You could begin with this experiment: just lightly press a bullet into the neck, then attempt to chamber it in your rifle (no primer or powder in this case, of course). If you are able to stick the bullet into the lands a little, then a one caliber seating depth would give you a 0.308 jump, which is a bit long, but might not shoot too bad. As long as the bullet will be held with decent neck tension, having a long COAL is neither here nor there. You will find that it will take slightly more charge weight to get back to the same velocity you originally had. Powder charges in manuals are for specific COALs, and when I find the ideal COAL for my rifle, I often will end up with a load that is slightly above the maximum listed, but remember we are filling a slightly larger combustion chamber when we load longer COALs. ALWAYS TEST FOR SIGNS OF EXCESSIVE PRESSURE BEFORE SETTLING ON A LOAD! [/QUOTE]
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