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Hunting
Long Range Hunting & Shooting
Why does velicity increase with # of shots?
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<blockquote data-quote="MTLIVIN" data-source="post: 1238969" data-attributes="member: 42384"><p>What I can tell you for sure is that there is zero correlation between the two rifles, we actually haven't even shot them side by side, just both experienced the problem of groups opening up and then confirming the velocity had increased enough to move out of the accuracy node (with 2 separate Magnetospeeds). I will say my buddies 28 Nosler seems to have moved up in speed and out of the node the worst of the two rifles. </p><p> </p><p>The above link does show some good evidence that I agree with, if velocity goes up it is because pressure also went up and if the charge hasn't changed that leaves only the barrel to look at. I clean mine with Wipeout and Boretech, alternating every 50 shots or so. We both let the barrel cool between shots so it wouldn't be fun to find out the barrels are already heat cracked and eroding at 200 rounds for the 28 Nosler and 400 rounds for the 7mm mag. The smith that built the 28 nosler may have a borescope to look at them, but Im not even going there until rifle season is over in MT. </p><p> </p><p>So when you guys are putting on new barrels, what do you typically see for velocity gains over 50, 100, 500 shots (same charge, lot, ect...)? Do you get the velocity to level out perfectly after 100 rounds and how long does that last???</p></blockquote><p></p>
[QUOTE="MTLIVIN, post: 1238969, member: 42384"] What I can tell you for sure is that there is zero correlation between the two rifles, we actually haven't even shot them side by side, just both experienced the problem of groups opening up and then confirming the velocity had increased enough to move out of the accuracy node (with 2 separate Magnetospeeds). I will say my buddies 28 Nosler seems to have moved up in speed and out of the node the worst of the two rifles. The above link does show some good evidence that I agree with, if velocity goes up it is because pressure also went up and if the charge hasn't changed that leaves only the barrel to look at. I clean mine with Wipeout and Boretech, alternating every 50 shots or so. We both let the barrel cool between shots so it wouldn't be fun to find out the barrels are already heat cracked and eroding at 200 rounds for the 28 Nosler and 400 rounds for the 7mm mag. The smith that built the 28 nosler may have a borescope to look at them, but Im not even going there until rifle season is over in MT. So when you guys are putting on new barrels, what do you typically see for velocity gains over 50, 100, 500 shots (same charge, lot, ect...)? Do you get the velocity to level out perfectly after 100 rounds and how long does that last??? [/QUOTE]
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Why does velicity increase with # of shots?
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