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Hunting
The Basics, Starting Out
Load advice .308 win
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<blockquote data-quote="earplay" data-source="post: 585523" data-attributes="member: 38054"><p>Ok, it is summer here at the moment so I figure I should be ok if no pressure signs. I thought Varget was relatively temp tolerant, so I assumed temp increase shouldn't hurt much?</p><p></p><p>I worked up to 44.7gn with no obvious pressure signs. See target (pulled the lower left shot, not sure about the other one left)</p><p></p><p>My biggest dilemma now relates to velocity. The first 44.7gn shot was running 2553, then the next 2 shots posted similar velocities. The last 2 got progressively slower... the final shot posting just over 2500fps.</p><p></p><p>I was a little rushed so wasn't taking long for barrel to cool down between shots. My current understanding was that velocity increased as barrel heated up, but have struggled to find any real info on the net about this. Can anyone explain?</p><p></p><p>My rudimentary understanding of engineering would indicate a hot barrel has expanded, producing a greater bore diameter and less pressure/velocity??</p></blockquote><p></p>
[QUOTE="earplay, post: 585523, member: 38054"] Ok, it is summer here at the moment so I figure I should be ok if no pressure signs. I thought Varget was relatively temp tolerant, so I assumed temp increase shouldn't hurt much? I worked up to 44.7gn with no obvious pressure signs. See target (pulled the lower left shot, not sure about the other one left) My biggest dilemma now relates to velocity. The first 44.7gn shot was running 2553, then the next 2 shots posted similar velocities. The last 2 got progressively slower... the final shot posting just over 2500fps. I was a little rushed so wasn't taking long for barrel to cool down between shots. My current understanding was that velocity increased as barrel heated up, but have struggled to find any real info on the net about this. Can anyone explain? My rudimentary understanding of engineering would indicate a hot barrel has expanded, producing a greater bore diameter and less pressure/velocity?? [/QUOTE]
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