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Rifles, Reloading, Optics, Equipment
Reloading
Heavy load for 300 WSM
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<blockquote data-quote="brentc" data-source="post: 582791" data-attributes="member: 16938"><p>Some info for those of you that like running heavy loads in the 300 WSM, I did some experimenting today with IMR 7828SSC and the Berger 230 OTM tactical Hybrid. I was intrigued with this combo because of the downrange energy. There simply is not a .308 hunting bullet on the market that can match the energy of this bullet even if flying 100 fps faster. Not even the 210 VLD at 2850.</p><p> </p><p>My rifle is a factory Winchester M70 Extreme Weather, 24" bbl, topped with a Zeiss Conquest 4.5-14x44. </p><p> </p><p>Load information: I used resized and trimmed Norma brass and CCI 200's for the test. I seated the bullets right at the lands, .000 jump which ends up at 3.310" COAL. BTW they still fit in the M70 magazine.</p><p> </p><p>I loaded 18 rounds ranging from 64 - 66 grains of 7828SSC and fired 3 shot groups to determine an OCW. the weather was a little drizzly today, and I ended up losing two chrono readings, but I still feel like I got good data. Here are the results.</p><p> </p><p>Load #1 64.0 grains IMR 7828SSC (Good group .35" all touching)</p><p>#1 2650 fps</p><p>#2 2624 fps</p><p>#3 -------</p><p>ES = 26 fps</p><p>Ave = 2637 fps (baseline)</p><p> </p><p>Load #2 64.4 grains (Good group .55" in a cluster)</p><p>#1 2677 fps</p><p>#2 2656 fps</p><p>#3 2645 fps</p><p>ES = 32 fps</p><p>Ave = 2659 fps (+22)</p><p> </p><p>Load #3 64.8 grains (scattered group 1.5")</p><p>#1 2682 fps</p><p>#2 2666 fps</p><p>#3 ------</p><p>ES = 16 fps</p><p>Ave = 2674 fps (+15)</p><p> </p><p>Load #4 65.2 grains (tightening group .40" group - horizontal all touching)</p><p>#1 2688 fps</p><p>#2 2704 fps</p><p>#3 2672 fps</p><p>ES = 32 fps</p><p>Ave = 2688 fps (+14)</p><p> </p><p>Load #5 65.6 grains (Tight group .30 with slight vertical)</p><p>#1 2721 fps</p><p>#2 2710 fps</p><p>#3 2682 fps</p><p>ES = 39 fps</p><p>Ave = 2704 fps (+16)</p><p> </p><p>Load #6 66.0 grains (max load - slightly stiff bolt lift, not a horrible group - group was 2 shots on top of each other and the 3rd was about 1" to the left)</p><p>#1 2693 fps</p><p>#2 2688 fps</p><p>#3 2704 fps</p><p>ES = 16 fps</p><p>Ave 2695 fps (-9)</p><p> </p><p>You can see the classic pressure curve leading up to the max load. It appears that the accuracy node is 65.4 or 65.5 grains. ES could improve a bit and it might with either of these charges. Overall, I think the test was a success and it opens up a bit more capability with the WSM. This bullet is about as close to wind proof as you'll find for a .30 cal and the down range energy is phenomenal. These are my results in my rifle. Load at your own risk.</p></blockquote><p></p>
[QUOTE="brentc, post: 582791, member: 16938"] Some info for those of you that like running heavy loads in the 300 WSM, I did some experimenting today with IMR 7828SSC and the Berger 230 OTM tactical Hybrid. I was intrigued with this combo because of the downrange energy. There simply is not a .308 hunting bullet on the market that can match the energy of this bullet even if flying 100 fps faster. Not even the 210 VLD at 2850. My rifle is a factory Winchester M70 Extreme Weather, 24" bbl, topped with a Zeiss Conquest 4.5-14x44. Load information: I used resized and trimmed Norma brass and CCI 200's for the test. I seated the bullets right at the lands, .000 jump which ends up at 3.310" COAL. BTW they still fit in the M70 magazine. I loaded 18 rounds ranging from 64 - 66 grains of 7828SSC and fired 3 shot groups to determine an OCW. the weather was a little drizzly today, and I ended up losing two chrono readings, but I still feel like I got good data. Here are the results. Load #1 64.0 grains IMR 7828SSC (Good group .35" all touching) #1 2650 fps #2 2624 fps #3 ------- ES = 26 fps Ave = 2637 fps (baseline) Load #2 64.4 grains (Good group .55" in a cluster) #1 2677 fps #2 2656 fps #3 2645 fps ES = 32 fps Ave = 2659 fps (+22) Load #3 64.8 grains (scattered group 1.5") #1 2682 fps #2 2666 fps #3 ------ ES = 16 fps Ave = 2674 fps (+15) Load #4 65.2 grains (tightening group .40" group - horizontal all touching) #1 2688 fps #2 2704 fps #3 2672 fps ES = 32 fps Ave = 2688 fps (+14) Load #5 65.6 grains (Tight group .30 with slight vertical) #1 2721 fps #2 2710 fps #3 2682 fps ES = 39 fps Ave = 2704 fps (+16) Load #6 66.0 grains (max load - slightly stiff bolt lift, not a horrible group - group was 2 shots on top of each other and the 3rd was about 1" to the left) #1 2693 fps #2 2688 fps #3 2704 fps ES = 16 fps Ave 2695 fps (-9) You can see the classic pressure curve leading up to the max load. It appears that the accuracy node is 65.4 or 65.5 grains. ES could improve a bit and it might with either of these charges. Overall, I think the test was a success and it opens up a bit more capability with the WSM. This bullet is about as close to wind proof as you'll find for a .30 cal and the down range energy is phenomenal. These are my results in my rifle. Load at your own risk. [/QUOTE]
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Heavy load for 300 WSM
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