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Rifles, Reloading, Optics, Equipment
Reloading
338 lapua reloading help
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<blockquote data-quote="dougduey" data-source="post: 1634428" data-attributes="member: 33159"><p>The MagnetoSpeed can definitely mess with POI and grouping. Shoot without it on and see if the issue goes away. I always shoot with it on when starting out the load process to find max and see what kind of velocities I'm getting, then I take it off and don't use it until I'm pretty much done with the load or need velocity verification or checking how stable the velocity is for a certain load. I look for a velocity node where the velocity flattens out. Then I'll load up 10 rounds in the middle of that flat spot and see how it groups with 5 shots and then put on the Magneto for the next 5 shots and see what my ES and SD are for velocity. If I have good ES and SD but the groups aren't as tight as I'd like, I'll adjust seating depth. </p><p>H1000 and Retumbo are the best powders for the 300 gr bullets in the Lapua, so stay with H1000</p></blockquote><p></p>
[QUOTE="dougduey, post: 1634428, member: 33159"] The MagnetoSpeed can definitely mess with POI and grouping. Shoot without it on and see if the issue goes away. I always shoot with it on when starting out the load process to find max and see what kind of velocities I'm getting, then I take it off and don't use it until I'm pretty much done with the load or need velocity verification or checking how stable the velocity is for a certain load. I look for a velocity node where the velocity flattens out. Then I'll load up 10 rounds in the middle of that flat spot and see how it groups with 5 shots and then put on the Magneto for the next 5 shots and see what my ES and SD are for velocity. If I have good ES and SD but the groups aren't as tight as I'd like, I'll adjust seating depth. H1000 and Retumbo are the best powders for the 300 gr bullets in the Lapua, so stay with H1000 [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
338 lapua reloading help
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