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<blockquote data-quote="Jcann" data-source="post: 2784039" data-attributes="member: 33119">To stay in that zone you need to buy your components in bulk (8 or more lbs of powder, 1,000&nbsp; or more primers,&nbsp; 500 or more bullets all with the same lot number). I&#039;ve had as much as 90fps drop in muzzle velocity due to different lots of the same powder. I&#039;ve also found that case annealing should be done every 3rd loading due to case harding the brass through repeated loadings. This effects bullet tension which effects chamber pressure. Granted I&#039;m shooting a round with ~65,000 psi.If you&#039;re shooting a barrel burner like a 243, 6.5x284, or 7mm mag you&#039;ll probably notice velocity and accuracy degradation between 800-1,200 rounds due to throat erosion depending on how hot your running your loads. You may be able to&nbsp; alleviate this some what by chasing the lands by seating your bullets further out but this is dependent on magazine COAL.Be mindful that sometimes you feel like you&#039;re chasing your tail in the hand loading arena.</blockquote>

[QUOTE="Jcann, post: 2784039, member: 33119"] To stay in that zone you need to buy your components in bulk (8 or more lbs of powder, 1,000 or more primers, 500 or more bullets all with the same lot number). I've had as much as 90fps drop in muzzle velocity due to different lots of the same powder. I've also found that case annealing should be done every 3rd loading due to case harding the brass through repeated loadings. This effects bullet tension which effects chamber pressure. Granted I'm shooting a round with ~65,000 psi. If you're shooting a barrel burner like a 243, 6.5x284, or 7mm mag you'll probably notice velocity and accuracy degradation between 800-1,200 rounds due to throat erosion depending on how hot your running your loads. You may be able to alleviate this some what by chasing the lands by seating your bullets further out but this is dependent on magazine COAL. Be mindful that sometimes you feel like you're chasing your tail in the hand loading arena. [/QUOTE]

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