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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Where has my velocity gone??
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<blockquote data-quote="Gunpoor" data-source="post: 160733" data-attributes="member: 8358"><p>I have an FN Mauser that I had rebarreled to 264Win Magnum (parent case for the 7mmRM) not too long ago and haven't put very many rounds through, with a Shilen barrel. I loaded some 140 Hornady SP's with H4831SC and at 3000 ft/sec they started to group pretty decent and in my judgement were at the threshold of leaving safe operating pressure. I am not a master gunsmith but have had a couple of rifles that were shot out and though they showed reduction in velocity the most tell tale sign was the accuracy went south. These rifles would shoot a group that I would consider acceptable for normal big game hunting out to 350 yds, IMHO at least, and then the next group would open up further and the next group would open up more. Even while allowing the barrel to remain fairly cool after the third or fourth four shot group they would measure 4" to 5" at 100', and the first group from a cold barrel would measure 1" to 1 1/4". I think you should get some Eliminator cleaning solvent for your barrels and give them a good cleaning. I have seen Eliminator clean the throats on match rifles that were thought to be "shot out" to bring them back to their youthful accuracy. A barrel that has been shot many rounds will build up fouling in the throat that becomes like glass from the heat and ammonia based solvents won't remove it but Eliminator if left to soak and then remove and then repeat will get it down to bare steel. Eliminator has no ammonia in it and therefore will not "eat" the carbon out of steel when left for extended periods of time the way most commercial bore solvents will. I am not in any way involved with this product but have seen the results of its use on match rifles that had many, many rounds through them. The test of a load for me is consistant and repeatable accuracy and if the velocity is on the higher end, well, so much the better. Some barrels are just faster than others but groups is where rubber meets the road. Good luck and safe shooting</p></blockquote><p></p>
[QUOTE="Gunpoor, post: 160733, member: 8358"] I have an FN Mauser that I had rebarreled to 264Win Magnum (parent case for the 7mmRM) not too long ago and haven't put very many rounds through, with a Shilen barrel. I loaded some 140 Hornady SP's with H4831SC and at 3000 ft/sec they started to group pretty decent and in my judgement were at the threshold of leaving safe operating pressure. I am not a master gunsmith but have had a couple of rifles that were shot out and though they showed reduction in velocity the most tell tale sign was the accuracy went south. These rifles would shoot a group that I would consider acceptable for normal big game hunting out to 350 yds, IMHO at least, and then the next group would open up further and the next group would open up more. Even while allowing the barrel to remain fairly cool after the third or fourth four shot group they would measure 4" to 5" at 100', and the first group from a cold barrel would measure 1" to 1 1/4". I think you should get some Eliminator cleaning solvent for your barrels and give them a good cleaning. I have seen Eliminator clean the throats on match rifles that were thought to be "shot out" to bring them back to their youthful accuracy. A barrel that has been shot many rounds will build up fouling in the throat that becomes like glass from the heat and ammonia based solvents won't remove it but Eliminator if left to soak and then remove and then repeat will get it down to bare steel. Eliminator has no ammonia in it and therefore will not "eat" the carbon out of steel when left for extended periods of time the way most commercial bore solvents will. I am not in any way involved with this product but have seen the results of its use on match rifles that had many, many rounds through them. The test of a load for me is consistant and repeatable accuracy and if the velocity is on the higher end, well, so much the better. Some barrels are just faster than others but groups is where rubber meets the road. Good luck and safe shooting [/QUOTE]
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Where has my velocity gone??
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