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Rifles, Reloading, Optics, Equipment
Reloading
Velocity & Pressure Spike
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<blockquote data-quote="dsculley" data-source="post: 1303990" data-attributes="member: 77514"><p>I just can't buy the difference is because the brass is now fire-formed to his chamber. My 6.5x47 shoots the same load in the same group whether with virgin brass or fire-formed brass. I have tested this and there is no difference. </p><p></p><p>He had to reduce his load a full 4 grains, or about 4.2%. That is a large difference. If the difference were 0.4 gr I could accept that the difference is due to the brass being fire-formed. The brass is not smaller now that it is fire-formed than when it was virgin. The chamber has not changed dimensions. If expanding the virgin brass to his chamber absorbed the energy from 4.0 grains of powder, that must be one large chamber. His brass would now have lots more capacity than before. </p><p></p><p>Live2huntmt, perhaps you could measure and compare the capacity of your virgin vs once-fired brass? I don't think there will be enough difference to explain this, but would be one more bit of information.</p><p></p><p>It will also be interesting to see what you find when you inspect and clean your rifle. It would be interesting to be able to run a bore scope down the barrel. I would not expect the Lilja barrel to be badly fouled, but I suppose a carbon ring could explain the pressure spike. Please let us know what you find.</p></blockquote><p></p>
[QUOTE="dsculley, post: 1303990, member: 77514"] I just can't buy the difference is because the brass is now fire-formed to his chamber. My 6.5x47 shoots the same load in the same group whether with virgin brass or fire-formed brass. I have tested this and there is no difference. He had to reduce his load a full 4 grains, or about 4.2%. That is a large difference. If the difference were 0.4 gr I could accept that the difference is due to the brass being fire-formed. The brass is not smaller now that it is fire-formed than when it was virgin. The chamber has not changed dimensions. If expanding the virgin brass to his chamber absorbed the energy from 4.0 grains of powder, that must be one large chamber. His brass would now have lots more capacity than before. Live2huntmt, perhaps you could measure and compare the capacity of your virgin vs once-fired brass? I don't think there will be enough difference to explain this, but would be one more bit of information. It will also be interesting to see what you find when you inspect and clean your rifle. It would be interesting to be able to run a bore scope down the barrel. I would not expect the Lilja barrel to be badly fouled, but I suppose a carbon ring could explain the pressure spike. Please let us know what you find. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Velocity & Pressure Spike
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