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Long Range Hunting & Shooting
How much throat erosion is “normal”
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<blockquote data-quote="MagnumManiac" data-source="post: 2791244" data-attributes="member: 10755"><p>Bullets don't erode throats. Have shot out several barrels and 2 things have always been the deciding factor:</p><p>Number one is powder type, powder temp and chamber design.</p><p>Number two is how fast you shoot.</p><p>It is proven that ball powders, although double base, have a colder burn and the flame front moves through the powder faster before the powder column starts being moved past the throat. This protects the throat both from the heat, but also the abrasive nature of the powder.</p><p>Extruded powders, regardless of composition, are abrasive, single base burns hotter than double base, but double base has more energy and scrubs the rifling harder. In this scenario it is the abrasive nature that erodes the rifling, not the heat.</p><p>I had 2 identical 30" barrels in 300WM I used for mid range F-class. One was fed H1000 only, the other was fed RL25 only. Accuracy fell off the RL25 barrel first after 1400 rounds and a total of .089" throat erosion, a set back had it in new rifling and the accuracy returned. The H1000 barrel lasted 1680 rounds, had .079" throat erosion, but the rifling was smeared for another .100" from I assume was the plug of powder being forced down the barrel. A set back of 2 turns was needed to get into fresh rifling.</p><p>So, my take on this is that double base extruded powder is actually nicer on barrels, if I had of set back at .080" erosion, it would have been better in the long run. I get 3 set backs on these barrels.</p><p>I was not sponsored, so I had to pay for my barrel blanks, here in Australia a barrel costs over $1000, so not cheap at all.</p><p>A reamer only costs a few hundred and is affordable. For my 300WM I use the A191 chamber, you can look this up.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2791244, member: 10755"] Bullets don’t erode throats. Have shot out several barrels and 2 things have always been the deciding factor: Number one is powder type, powder temp and chamber design. Number two is how fast you shoot. It is proven that ball powders, although double base, have a colder burn and the flame front moves through the powder faster before the powder column starts being moved past the throat. This protects the throat both from the heat, but also the abrasive nature of the powder. Extruded powders, regardless of composition, are abrasive, single base burns hotter than double base, but double base has more energy and scrubs the rifling harder. In this scenario it is the abrasive nature that erodes the rifling, not the heat. I had 2 identical 30” barrels in 300WM I used for mid range F-class. One was fed H1000 only, the other was fed RL25 only. Accuracy fell off the RL25 barrel first after 1400 rounds and a total of .089” throat erosion, a set back had it in new rifling and the accuracy returned. The H1000 barrel lasted 1680 rounds, had .079” throat erosion, but the rifling was smeared for another .100” from I assume was the plug of powder being forced down the barrel. A set back of 2 turns was needed to get into fresh rifling. So, my take on this is that double base extruded powder is actually nicer on barrels, if I had of set back at .080” erosion, it would have been better in the long run. I get 3 set backs on these barrels. I was not sponsored, so I had to pay for my barrel blanks, here in Australia a barrel costs over $1000, so not cheap at all. A reamer only costs a few hundred and is affordable. For my 300WM I use the A191 chamber, you can look this up. Cheers. [/QUOTE]
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How much throat erosion is “normal”
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