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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Short necks=short throat life??
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<blockquote data-quote="goodgrouper" data-source="post: 58015" data-attributes="member: 2852"><p>Waltech Jim and others,</p><p> Thanks for your posts. That is an interesting point you bring up about moly actually causing more throat damage because of having to bump up the powder charge. I did have to do that to maintain the "sweet spot", but moly's intended purpose is to reduce friction--at least that's what is advertised, but I'm starting to think it doesn't make as much difference as what they say it does. I have noticed that the 100 and 1000 yard benchrest clan praised it holy 5 years ago, and now you see less than 10 percent of the guys still running it. Funny how the tastes change. </p><p> You also have a great memory. My post on 12/19 did mention that to get the "sweet spot" with that load, it was just starting to loosen the primer pockets with a fairly heavy ejector mark. But I didn't mention that my swift was the same way. They both kinda had that "magnum gun" quality of not wanting to shoot until they were running max. This article I was reading basicly found that the longer necks of some cartridges, combined with shallow shoulder angles (&gt;30 degrees) shot the hottest gases from ignition down the shoulder wall and into the neck on the opposite side instead of into the throat of your barrel. Thus, their conclusion was that 2 cartridges with the same flame temp, case capacity, caliber, and primer with different shoulder angles and neck lengths would give greater throat life to the longer necked case. A perfect example of this comparison is the 220 swift and the 22-250 AI. </p><p> Fifty driver is correct about ball powders having slightly cooler and less abrasive qualities than extruded powders, but it shouldn't be enough of a difference to increase barrel life by half, should it?? I mean holy cow, it went from 1050 rounds to over 2000. I have a hard time believing that N550 is THAT hot. What's your thoughts?</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 58015, member: 2852"] Waltech Jim and others, Thanks for your posts. That is an interesting point you bring up about moly actually causing more throat damage because of having to bump up the powder charge. I did have to do that to maintain the "sweet spot", but moly's intended purpose is to reduce friction--at least that's what is advertised, but I'm starting to think it doesn't make as much difference as what they say it does. I have noticed that the 100 and 1000 yard benchrest clan praised it holy 5 years ago, and now you see less than 10 percent of the guys still running it. Funny how the tastes change. You also have a great memory. My post on 12/19 did mention that to get the "sweet spot" with that load, it was just starting to loosen the primer pockets with a fairly heavy ejector mark. But I didn't mention that my swift was the same way. They both kinda had that "magnum gun" quality of not wanting to shoot until they were running max. This article I was reading basicly found that the longer necks of some cartridges, combined with shallow shoulder angles (>30 degrees) shot the hottest gases from ignition down the shoulder wall and into the neck on the opposite side instead of into the throat of your barrel. Thus, their conclusion was that 2 cartridges with the same flame temp, case capacity, caliber, and primer with different shoulder angles and neck lengths would give greater throat life to the longer necked case. A perfect example of this comparison is the 220 swift and the 22-250 AI. Fifty driver is correct about ball powders having slightly cooler and less abrasive qualities than extruded powders, but it shouldn't be enough of a difference to increase barrel life by half, should it?? I mean holy cow, it went from 1050 rounds to over 2000. I have a hard time believing that N550 is THAT hot. What's your thoughts? [/QUOTE]
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Short necks=short throat life??
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