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Hunting
The Basics, Starting Out
Is my barrel worn out?
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<blockquote data-quote="Blkrflguy" data-source="post: 2255714" data-attributes="member: 116381"><p>I have a 308 that shot 3/8" min every day. Then after 800 rounds (I keep a log), the groups have migrated the last few months to just under 1". So I loaded up 5 rounds and decreased my seating depth by .003". The gun shot a little better. Then I loaded up 5 more rounds with a decreased seating depth of .006". This brought the gun back to grouping 3/8". What happens is your throat burn increases your bullet jump. You have to keep the same jump if you want that same load to perform like it did when you found it. Of course not knowing how many rounds you have on a barrel, it could be that in fact your barrel is toast but, probably not if you've only got 1-1.5k down it. I'd do the easy thing first and check for loose fasteners, etc. Then move to decreasing your jump by .003" at a time.</p></blockquote><p></p>
[QUOTE="Blkrflguy, post: 2255714, member: 116381"] I have a 308 that shot 3/8" min every day. Then after 800 rounds (I keep a log), the groups have migrated the last few months to just under 1". So I loaded up 5 rounds and decreased my seating depth by .003". The gun shot a little better. Then I loaded up 5 more rounds with a decreased seating depth of .006". This brought the gun back to grouping 3/8". What happens is your throat burn increases your bullet jump. You have to keep the same jump if you want that same load to perform like it did when you found it. Of course not knowing how many rounds you have on a barrel, it could be that in fact your barrel is toast but, probably not if you've only got 1-1.5k down it. I'd do the easy thing first and check for loose fasteners, etc. Then move to decreasing your jump by .003" at a time. [/QUOTE]
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The Basics, Starting Out
Is my barrel worn out?
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