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Rifles, Reloading, Optics, Equipment
Reloading
Ramshot Magnum vs. barrel life
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<blockquote data-quote="davewilson" data-source="post: 94177" data-attributes="member: 4491"><p>50,sorry it took so long to reply i've been away for a while.the main point here is throat erosion comparing stick to ball powders.i don't agree with some of your theories at all and i know some of them are not "facts" as you call them.</p><p></p><p>a bullets ogive touching the rifling doesn't hardly seal off anything. what is the percentage of bearing surface of the top of the lands compared to the bottom of the grooves in one of those 3 groove barrels?that's the only place where any gases are sealed off.of course the farther the bullet is pushed into the lands,the more it will be sealed off. also a 1/4 thousands is plenty of room for hot gases to escape by creating a cutting torch effect.i agree that the smaller this number, the smaller the amount of erosion.if hot gases escaping around the bullet while it is getting started into the lands aren't much of a reason for throat erosion,why do banded style of bullets get at least twice the throat life?</p><p></p><p>the point where you guys are wrong is this peak chamber pressure thing.peak pressure occurs getting the bullet started. by this i mean getting the bullet fully engraved into the rifling.i don't know what it takes to start the bullet moving and i agree it's different for bullets just touching, jammed into the lands, or way off the lands. but the peak pressure occurs getting the full length of the bearing surface engraved into the rifling.once it is completely engraved in the rifling it starts accellerating very fast and chamber pressure goes down.peak pressure is not 3 or 4 inches down the barrel.peak pressure at 3 or 4" will happen if you use a banded style of bullet but i assume we are talking about conventional jacketed lead bullets.might i suggest you start looking at actual pressure curves developed when testing bullets instead of quick load which is simply crunching a bunch of theoretical numbers.</p><p></p><p>i agree that chunks of powder do fly into the throat causing erosion. i just don't think it's anywhere near as much as stated earlier and i don't remember seeing anything proving this.my understanding is ball powders burn cooler and this is the main reason for longer throat life.</p></blockquote><p></p>
[QUOTE="davewilson, post: 94177, member: 4491"] 50,sorry it took so long to reply i've been away for a while.the main point here is throat erosion comparing stick to ball powders.i don't agree with some of your theories at all and i know some of them are not "facts" as you call them. a bullets ogive touching the rifling doesn't hardly seal off anything. what is the percentage of bearing surface of the top of the lands compared to the bottom of the grooves in one of those 3 groove barrels?that's the only place where any gases are sealed off.of course the farther the bullet is pushed into the lands,the more it will be sealed off. also a 1/4 thousands is plenty of room for hot gases to escape by creating a cutting torch effect.i agree that the smaller this number, the smaller the amount of erosion.if hot gases escaping around the bullet while it is getting started into the lands aren't much of a reason for throat erosion,why do banded style of bullets get at least twice the throat life? the point where you guys are wrong is this peak chamber pressure thing.peak pressure occurs getting the bullet started. by this i mean getting the bullet fully engraved into the rifling.i don't know what it takes to start the bullet moving and i agree it's different for bullets just touching, jammed into the lands, or way off the lands. but the peak pressure occurs getting the full length of the bearing surface engraved into the rifling.once it is completely engraved in the rifling it starts accellerating very fast and chamber pressure goes down.peak pressure is not 3 or 4 inches down the barrel.peak pressure at 3 or 4" will happen if you use a banded style of bullet but i assume we are talking about conventional jacketed lead bullets.might i suggest you start looking at actual pressure curves developed when testing bullets instead of quick load which is simply crunching a bunch of theoretical numbers. i agree that chunks of powder do fly into the throat causing erosion. i just don't think it's anywhere near as much as stated earlier and i don't remember seeing anything proving this.my understanding is ball powders burn cooler and this is the main reason for longer throat life. [/QUOTE]
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Ramshot Magnum vs. barrel life
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