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Time between shots
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<blockquote data-quote="Michael Eichele" data-source="post: 300895" data-attributes="member: 1007"><p>Due to a large case capacity, I let 3 minutes pass between shot one and shot 2 and 4-5 minutes between shot 2 and 3 in my 338 EDGE barrel. I do this to help save the barrel. So far after 100 rounds, the throat and barrel look brand new with not a single heat crack in the barrel. This is the only reason I do this.</p><p></p><p>With my 308 I will fire 1-5 at a normal pace whether it is practice or developmental.</p><p></p><p>Each rifle will be different. Some rifles will just NOT put bullet #1 in the group from a cold bore even if it is 60+ degrees outside. Most rifles when it is above freezing will put 1-3 (for a skinny barrel and 1-5 in a heavy barrel) in the same group. With most rifles the cold bore shot means little unless the barrel is very cold. Then #1 typically wont go in the group. The colder it gets, the worse it gets. Almost all rifles will suffer some kind of bullet #1 POI shift when it gets cold enough. I think it is even safe to say all barrels will suffer a POI change given enough temprature drop.</p><p></p><p>You will have to test your rifle to see at what point bullet #1 wont stay in the group. This time of year, I suspect you wont have to worry about it.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 300895, member: 1007"] Due to a large case capacity, I let 3 minutes pass between shot one and shot 2 and 4-5 minutes between shot 2 and 3 in my 338 EDGE barrel. I do this to help save the barrel. So far after 100 rounds, the throat and barrel look brand new with not a single heat crack in the barrel. This is the only reason I do this. With my 308 I will fire 1-5 at a normal pace whether it is practice or developmental. Each rifle will be different. Some rifles will just NOT put bullet #1 in the group from a cold bore even if it is 60+ degrees outside. Most rifles when it is above freezing will put 1-3 (for a skinny barrel and 1-5 in a heavy barrel) in the same group. With most rifles the cold bore shot means little unless the barrel is very cold. Then #1 typically wont go in the group. The colder it gets, the worse it gets. Almost all rifles will suffer some kind of bullet #1 POI shift when it gets cold enough. I think it is even safe to say all barrels will suffer a POI change given enough temprature drop. You will have to test your rifle to see at what point bullet #1 wont stay in the group. This time of year, I suspect you wont have to worry about it. [/QUOTE]
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