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For some reason all the books have this bullet Speer 130 gr BTSP in the 7mm-08 seated back at 2.73" COAL, . When I actually measure this bullet in my rifle it touches the rifling at 2.81". How close to the rifling can I seat a bullet before I start to see increase in pressure? "I will not raise taxes on those making more than 250k" | ||
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One of Us |
I would think that you could seat at 2.80" or less and not have a pressure problem. Velocity will also decrease the farther from the lands you seat. But you should be able to find an acceptable load at 2.78" which would be .030" off and not lose too much velocity and still be completely safe (other factors being under control) ____________________________________ There are those who would misteach us that to stick in a rut is consistency - and a virtue, and that to climb out of the rut is inconsistency - and a vice. - Mark Twain | Chinese Proverb: When someone shares something of value with you and you benefit from it, you have a moral obligation to share it with others. ___________________________________ | |||
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one of us |
The bullet ogive is much more relevant than the actual OAL regarding chamber pressure. A car can easily drive over a curb with a little running start; but if you park right up against the curb and step on the gas - it requires a whole lot more force to start moving. If you are seeking the ultimate accuracy (and if you don't plan to use your magazine) you should start at least .001" behind the rifling, and try reducing the OAL in .003" increments, until you come up with the most accurate load. I like to start at about .005 and work back to about .050 ..I usually find my OAL somewhere in between. | |||
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One of Us |
thanks for the info, I will try 2.77 and there about see what happens. Just don't want to get into unexpected pressure spike. "I will not raise taxes on those making more than 250k" | |||
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