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sudden velocity increase mystery
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<blockquote data-quote="Robbin" data-source="post: 395966" data-attributes="member: 12246"><p><span style="color: black"><span style="font-family: 'Verdana'">Thanks elkaholic, </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'"> I thoroughly clean every 30 to 40 rounds. Because of the tight neck, I measure ever loaded round before it goes in the box to take to the range. I don't check every cases length, as they are all the same type and number of firings and all cut to the same length at the start. I spot checked while annealing and all were well within the max allowed length. But any of those things would raise pressure, yet my sticky bolt has not returned since I lowered the powder charge. </span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Can you think of any way LESS powder could increase MV? It's a compressed load, even with the reduction of .4 grains, just not as much compression. </span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">I think it has to be physical, like my new batch of bullets is ever so slightly smaller in diameter or like I've worn just enough of the throat to make a difference. Interesting that it is so sudden, with so few rounds between the last time I shot a full group thru the crony and this trip. I know Weatherby mags get their bump in velocity without increasing pressure by extending the lead and making the bullet jump, thus giving it a head start before it hits the lands. But the jump is LARGE, far more than I could have wore with 200 shots. </span></span></p><p><span style="color: black"><span style="font-family: 'Verdana'">And I know the bullet is touching the lands when I close the breach, because I can feel it seating the bullet like it always does.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">You mentioned cleaning and I have recently changed cleaning solutions. I assume it is possible that I wasn't getting it clean enough before, but I was using ammonia based cleaners. I've switched to stuff that has no ammonia and they say you can't hurt your barrel with it, so I leave it in longer. Other than the actual solvent, my cleaning routine is the same. But I plug the bore, and fill the barrel with the cleaner all the way into the chamber and leave it that way for 15 to 20 min. Before I just poured it thru, let it set wet for 5 min, the wet patched and wet brushed with a nylon brush. However, the max velocities have been consistent from when I first started shooting the rifle. Still, that could be the difference.....</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Thanks for the input.</span></span></p></blockquote><p></p>
[QUOTE="Robbin, post: 395966, member: 12246"] [COLOR=black][FONT=Verdana]Thanks elkaholic, [/FONT][/COLOR] [COLOR=black][FONT=Verdana] I thoroughly clean every 30 to 40 rounds. Because of the tight neck, I measure ever loaded round before it goes in the box to take to the range. I don't check every cases length, as they are all the same type and number of firings and all cut to the same length at the start. I spot checked while annealing and all were well within the max allowed length. But any of those things would raise pressure, yet my sticky bolt has not returned since I lowered the powder charge. [/FONT][/COLOR] [COLOR=black][FONT=Verdana] [/FONT][/COLOR] [COLOR=black][FONT=Verdana]Can you think of any way LESS powder could increase MV? It's a compressed load, even with the reduction of .4 grains, just not as much compression. [/FONT][/COLOR] [COLOR=black][FONT=Verdana] [/FONT][/COLOR] [COLOR=black][FONT=Verdana]I think it has to be physical, like my new batch of bullets is ever so slightly smaller in diameter or like I've worn just enough of the throat to make a difference. Interesting that it is so sudden, with so few rounds between the last time I shot a full group thru the crony and this trip. I know Weatherby mags get their bump in velocity without increasing pressure by extending the lead and making the bullet jump, thus giving it a head start before it hits the lands. But the jump is LARGE, far more than I could have wore with 200 shots. [/FONT][/COLOR] [COLOR=black][FONT=Verdana]And I know the bullet is touching the lands when I close the breach, because I can feel it seating the bullet like it always does.[/FONT][/COLOR] [COLOR=black][FONT=Verdana] [/FONT][/COLOR] [COLOR=black][FONT=Verdana]You mentioned cleaning and I have recently changed cleaning solutions. I assume it is possible that I wasn't getting it clean enough before, but I was using ammonia based cleaners. I've switched to stuff that has no ammonia and they say you can't hurt your barrel with it, so I leave it in longer. Other than the actual solvent, my cleaning routine is the same. But I plug the bore, and fill the barrel with the cleaner all the way into the chamber and leave it that way for 15 to 20 min. Before I just poured it thru, let it set wet for 5 min, the wet patched and wet brushed with a nylon brush. However, the max velocities have been consistent from when I first started shooting the rifle. Still, that could be the difference.....[/FONT][/COLOR] [COLOR=black][FONT=Verdana] [/FONT][/COLOR] [COLOR=black][FONT=Verdana]Thanks for the input.[/FONT][/COLOR] [/QUOTE]
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