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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy issues with a custom 338 Laupa
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<blockquote data-quote="RockZ" data-source="post: 954632" data-attributes="member: 5750"><p>My 338 Lapua AI loves Retumbo, so,I'll have to suggest starting with that.</p><p> You can use whatever powder you want..the process is the same!</p><p></p><p>I think the problem is that you are not doing a proper seating depth test. Your max difference is only .030"</p><p>That would be my First change not max.</p><p></p><p>Try loading 3 rounds of retumbo at 90,91,92,93 grains at .010" off the lands and shoot them through the chrono.</p><p>Pick the load with the tightest velocity spread. Looking for extreme spread of10fps or less.,... Don't worry about the group size in this step.</p><p></p><p>If one powder gives horrible velocity spreads....try your next favorite powder.</p><p>It's the powder and charge that you fine tune for tight vertical at long range.</p><p></p><p>You use seating depth to dial in the group . Now let's get that done!</p><p></p><p>Load 3 each at the powder charge that gave the tightest extreme spread. </p><p></p><p>Start at .010" off the lands then:</p><p>.040,.070,.100..120.</p><p></p><p>At 100yds...Shoot only 2 of each., that way you can really concentrate, the third is in case you pull a shot.</p><p>You should find a group that shoots the best....should put two in one hole.</p><p>That's your load.</p><p></p><p> If you feel good...shoot that third shot in your one hole group.</p><p>Save the others for fouling loads.</p></blockquote><p></p>
[QUOTE="RockZ, post: 954632, member: 5750"] My 338 Lapua AI loves Retumbo, so,I'll have to suggest starting with that. You can use whatever powder you want..the process is the same! I think the problem is that you are not doing a proper seating depth test. Your max difference is only .030" That would be my First change not max. Try loading 3 rounds of retumbo at 90,91,92,93 grains at .010" off the lands and shoot them through the chrono. Pick the load with the tightest velocity spread. Looking for extreme spread of10fps or less.,... Don't worry about the group size in this step. If one powder gives horrible velocity spreads....try your next favorite powder. It's the powder and charge that you fine tune for tight vertical at long range. You use seating depth to dial in the group . Now let's get that done! Load 3 each at the powder charge that gave the tightest extreme spread. Start at .010" off the lands then: .040,.070,.100..120. At 100yds...Shoot only 2 of each., that way you can really concentrate, the third is in case you pull a shot. You should find a group that shoots the best....should put two in one hole. That's your load. If you feel good...shoot that third shot in your one hole group. Save the others for fouling loads. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy issues with a custom 338 Laupa
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