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Rifles, Reloading, Optics, Equipment
Reloading
300 Win Mag Load Developement Problems
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<blockquote data-quote="BigBboy25" data-source="post: 647467" data-attributes="member: 18342"><p>Well here's what worked for me. I have a .300 Winny that I shoot 210's out of as well.</p><p></p><p>I first took Sierra's accuracy load for their 220 SMK and loaded that and found my seating depth. I started just kissing the rifling and worked off in 0.020" increments to 0.100 off all shooting the same powder and charge. You'll find one depth shoots a lot better than the other. Then I moved up and down in small increments around that length until I found the sweet spot. After that I played with powders, I used H4831SC, H1000 and RL-22. I had great results with all three about 1/2 MOA. For H1000 I liked 73.0-76.0 grs, H4831SC shot great from 70.0-71.5 and RL-22 shot really well from 70-72.5. All these were close to max so be careful, but best accuracy came on the hot side for all. I settled on 75.0 grs H1000. I use Fed215M primers and like them a lot. Berger's with their secant ogives are pretty picky about how far off the lands they are so that's where I'd start my focus. Mine shoot well with about 0.040" jump.</p></blockquote><p></p>
[QUOTE="BigBboy25, post: 647467, member: 18342"] Well here's what worked for me. I have a .300 Winny that I shoot 210's out of as well. I first took Sierra's accuracy load for their 220 SMK and loaded that and found my seating depth. I started just kissing the rifling and worked off in 0.020" increments to 0.100 off all shooting the same powder and charge. You'll find one depth shoots a lot better than the other. Then I moved up and down in small increments around that length until I found the sweet spot. After that I played with powders, I used H4831SC, H1000 and RL-22. I had great results with all three about 1/2 MOA. For H1000 I liked 73.0-76.0 grs, H4831SC shot great from 70.0-71.5 and RL-22 shot really well from 70-72.5. All these were close to max so be careful, but best accuracy came on the hot side for all. I settled on 75.0 grs H1000. I use Fed215M primers and like them a lot. Berger's with their secant ogives are pretty picky about how far off the lands they are so that's where I'd start my focus. Mine shoot well with about 0.040" jump. [/QUOTE]
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300 Win Mag Load Developement Problems
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