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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7 RUM Max Velocity
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<blockquote data-quote="Fiftydriver" data-source="post: 542436" data-attributes="member: 10"><p>In no way was I questioning your experience level so if I offended you I apologize to you as that was not my intention.</p><p> </p><p>There are situations where a specific weapon system will get dramatically faster velocity then it really should. I have had a couple of those in my shooting carreer. One also gave me quite a scare. It was a Ruger M77 chambered in 7mm Rem Mag. This rifle was scary fast and showed no pressure at all. I loaded the 140 gr Ballistic Silvertip up to 3440 fps with no pressure signs of any kind.</p><p> </p><p>One day I loaded up a new batch of brass with my favorite load and went out to check the zero before hunting season. First two shots went off great, third shot blew the floorplate off the rifle and cracked the stock walls around the mag box........</p><p> </p><p>Luckily I was not hurt in any way, scared crapless!!! but unhurt. I wanted to find out what the hell had happened as I had shot several hundred of these loads through the rifle and then all of a sudden, BOOM!!!</p><p> </p><p>Well, it took me a long time to figure it out but what I found that caused the problem was when I looked in the box of virgin brass, out of the remaining 50 rounds of brass, 5 of them had spider egg sacks inside the cases. These egg sacks took up a decent amount of case capacity but because they were relatively pliable, they still allows the seating of the bullet without much notice as I was not really paying attention to this. </p><p> </p><p>Still, because I was running on the ragged edge, it was just enough to spike pressures enough to blow the primer pocket severely and the flame cutting blew out the case in the controled round feed cut out of the bolt face which allowed the gas to take out the mag box and side walls.</p><p> </p><p>Learned two things with this lesson, 1. Check your cases before you load them!!! 2. Don't push things to the red line, "JUST IN CASE!!"</p><p> </p><p>Things happen and it never hurts to have some margin of error on your side!!!</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 542436, member: 10"] In no way was I questioning your experience level so if I offended you I apologize to you as that was not my intention. There are situations where a specific weapon system will get dramatically faster velocity then it really should. I have had a couple of those in my shooting carreer. One also gave me quite a scare. It was a Ruger M77 chambered in 7mm Rem Mag. This rifle was scary fast and showed no pressure at all. I loaded the 140 gr Ballistic Silvertip up to 3440 fps with no pressure signs of any kind. One day I loaded up a new batch of brass with my favorite load and went out to check the zero before hunting season. First two shots went off great, third shot blew the floorplate off the rifle and cracked the stock walls around the mag box........ Luckily I was not hurt in any way, scared crapless!!! but unhurt. I wanted to find out what the hell had happened as I had shot several hundred of these loads through the rifle and then all of a sudden, BOOM!!! Well, it took me a long time to figure it out but what I found that caused the problem was when I looked in the box of virgin brass, out of the remaining 50 rounds of brass, 5 of them had spider egg sacks inside the cases. These egg sacks took up a decent amount of case capacity but because they were relatively pliable, they still allows the seating of the bullet without much notice as I was not really paying attention to this. Still, because I was running on the ragged edge, it was just enough to spike pressures enough to blow the primer pocket severely and the flame cutting blew out the case in the controled round feed cut out of the bolt face which allowed the gas to take out the mag box and side walls. Learned two things with this lesson, 1. Check your cases before you load them!!! 2. Don't push things to the red line, "JUST IN CASE!!" Things happen and it never hurts to have some margin of error on your side!!! [/QUOTE]
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7 RUM Max Velocity
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