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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone own a 7mm 300 Win Mag?
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<blockquote data-quote="brian11" data-source="post: 1797078" data-attributes="member: 112031"><p>Yes, that is it. A wealth of information in that article! It's been my bible. Thank you so much for providing the link and thanks to the author.</p><p></p><p>I cast the chamber on my rifle and the shoulder looked pretty much like 300 Win Mag. I got a couple hundred cases on sale and necked them down, which was super-easy, as you're only going from 7.62 to 7.25.</p><p></p><p>I've had to do a lot of extrapolation with loads, because both H1000 and Retumbo are totally unavailable here now. No idea when any will come down the pipeline. So I had to use a powder I already had. I ended up using IMR 4350, which has seemed OK. Initial loads of 62 gn behind a VLD 180 yielded low-mid 28s. 63 gn behind a TMK 160 yielded about 3000 fps. I also have some slower powders like VV N165, but I'm just sticking with the 4350 until I figure out what bullet to use.</p><p></p><p>For my next loads batch, I'll use 63 and 64 gn 4350, respectively. I also borrowed 800 gn of H1000 from a friend, so I'm trying 2 batches of 5 rounds each with the VLD 180 and TMK 160.</p><p></p><p>My barrel is 26" and 1:10" twist, so the VLD 180s may not be fully stabilized, but they are shooting as well as the 160s at 100 yd. The box says I need 9", but maybe I'm getting away with a bit due to the bigger case & higher velocity. Next batch will be a bit more speed and moving the target out to 200 yd.</p><p></p><p>I also have some Sierra HPBT 180gn with BC .660, but the box says I need 8" twist, so I haven't even tried any of those.</p><p></p><p>The rifle doesn't have a very long throat, so I am seating the 180 VLDs about 0.190" shorter than the theoretical maximum with full bullet/neck contact. COAL to the tip of the 180s is 3.513. True COAL is measured with a 0.010 jump.</p></blockquote><p></p>
[QUOTE="brian11, post: 1797078, member: 112031"] Yes, that is it. A wealth of information in that article! It's been my bible. Thank you so much for providing the link and thanks to the author. I cast the chamber on my rifle and the shoulder looked pretty much like 300 Win Mag. I got a couple hundred cases on sale and necked them down, which was super-easy, as you're only going from 7.62 to 7.25. I've had to do a lot of extrapolation with loads, because both H1000 and Retumbo are totally unavailable here now. No idea when any will come down the pipeline. So I had to use a powder I already had. I ended up using IMR 4350, which has seemed OK. Initial loads of 62 gn behind a VLD 180 yielded low-mid 28s. 63 gn behind a TMK 160 yielded about 3000 fps. I also have some slower powders like VV N165, but I'm just sticking with the 4350 until I figure out what bullet to use. For my next loads batch, I'll use 63 and 64 gn 4350, respectively. I also borrowed 800 gn of H1000 from a friend, so I'm trying 2 batches of 5 rounds each with the VLD 180 and TMK 160. My barrel is 26" and 1:10" twist, so the VLD 180s may not be fully stabilized, but they are shooting as well as the 160s at 100 yd. The box says I need 9", but maybe I'm getting away with a bit due to the bigger case & higher velocity. Next batch will be a bit more speed and moving the target out to 200 yd. I also have some Sierra HPBT 180gn with BC .660, but the box says I need 8" twist, so I haven't even tried any of those. The rifle doesn't have a very long throat, so I am seating the 180 VLDs about 0.190" shorter than the theoretical maximum with full bullet/neck contact. COAL to the tip of the 180s is 3.513. True COAL is measured with a 0.010 jump. [/QUOTE]
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Anyone own a 7mm 300 Win Mag?
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