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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Decrease throat erosion with longer barrels?
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<blockquote data-quote="Lefty7mmstw" data-source="post: 816568" data-attributes="member: 48043"><p>There are a few things I look at as I try to get good service life from my rifles. I've knocked out a few barrels (one 24 cal and two 7mm's) so far but not nearly as many as some of the guys here.</p><p></p><p>The things I see affecting bore life the most are </p><p></p><p>1. the weight ratio of the powder and bullet ( ie. a 120 grain bullet and 60 grains is a 2 to 1; a 120 grain bullet and 90 grains powder is a 1.5 to 1 ratio. I don't like to get less than 1.5 to 1 ... I'd rather stay to 2 to 1 or more)</p><p>2. The pressure generated by said load- I don't run many top loads- many are near top but I leave a few Kpsi headroom</p><p>3. The (barrel and ambient) temperatures encountered while shooting- I like to shoot my more overbore rifles only when it's dang cold</p><p>4. the bore diameter- larger bores have more surface area to take on the affects of the powder blast and bullet friction</p><p>5. the composition of the load- ie. molly bullets, what primer ( certain brands have more abrasives in the mix than others), double base/ single base powder, etc.</p><p>6. the case design- a longer neck may help with throat erosion- my personal jury is out on that but others have given me plenty of reasons to at least think of it</p><p>7. the throating/ chambering- a freebore will shorten bore life but may drop pressures if actually utilized by the handloader- many people are to enthralled by seating bullets out there to chase the lands </p><p>8. steel composition itself- some steels are said to wear quicker than others</p><p>9. barrel treatments -- I don't use them myself but they can help</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 816568, member: 48043"] There are a few things I look at as I try to get good service life from my rifles. I've knocked out a few barrels (one 24 cal and two 7mm's) so far but not nearly as many as some of the guys here. The things I see affecting bore life the most are 1. the weight ratio of the powder and bullet ( ie. a 120 grain bullet and 60 grains is a 2 to 1; a 120 grain bullet and 90 grains powder is a 1.5 to 1 ratio. I don't like to get less than 1.5 to 1 ... I'd rather stay to 2 to 1 or more) 2. The pressure generated by said load- I don't run many top loads- many are near top but I leave a few Kpsi headroom 3. The (barrel and ambient) temperatures encountered while shooting- I like to shoot my more overbore rifles only when it's dang cold 4. the bore diameter- larger bores have more surface area to take on the affects of the powder blast and bullet friction 5. the composition of the load- ie. molly bullets, what primer ( certain brands have more abrasives in the mix than others), double base/ single base powder, etc. 6. the case design- a longer neck may help with throat erosion- my personal jury is out on that but others have given me plenty of reasons to at least think of it 7. the throating/ chambering- a freebore will shorten bore life but may drop pressures if actually utilized by the handloader- many people are to enthralled by seating bullets out there to chase the lands 8. steel composition itself- some steels are said to wear quicker than others 9. barrel treatments -- I don't use them myself but they can help [/QUOTE]
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Decrease throat erosion with longer barrels?
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