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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="chuckhammer" data-source="post: 1186801" data-attributes="member: 25816"><p>When forming from 300 Win Mag brass my necks were coming out pretty short, .210 or so. I switched to 300 H&H Mag brass trimmed down to 2.660 or so before fire forming. After fire forming my necks are now around .250-.260 with a case length of 2.650 or a little more. This version is a bit over 93 gr of water capacity, perhaps 93.5 or so when using WW Super headstamp brass. 7mm Valkyrie I call it.</p><p></p><p>My standard load for the 180 Hybrids is 86.0 gr RL33 with a CBTO length of 2.920 using the Hornady gauge. That's a .020 jump in my chamber. This load shows belt diameter expansion of .001-.002. Moving up a grain to 87.0 shows another .001-.002 of belt growth so I backed it down to 86.0 again. The primer pockets have stayed tight over 3 loadings at this level thus far. Case head marks show just a hint of flow into the ejector hole. Primer cups are not totally flattened, either, and cratering is very minimal. This is good for 3250 fps in my 28" barrel.</p><p></p><p>Retumbo was a bit too fast for max velocities using this combination of bullet and case. Maybe about right for 150s. Ran some 120 Ballistic Tips with IMR7828 and was getting 3850+ fps but with stronger pressure signs than I like. 82.0 gr is the downsized version that is waiting on my bench. The barrel heats up QUICKLY using large loads of 7828. I plan to use it for water jug exploding but it would also be a death ray on predators. I have some 162 AMAX loads to try as well with RL33. I'm also now playing with RL50 and the 180s. Haven't tried any 195 EOLs yet.</p></blockquote><p></p>
[QUOTE="chuckhammer, post: 1186801, member: 25816"] When forming from 300 Win Mag brass my necks were coming out pretty short, .210 or so. I switched to 300 H&H Mag brass trimmed down to 2.660 or so before fire forming. After fire forming my necks are now around .250-.260 with a case length of 2.650 or a little more. This version is a bit over 93 gr of water capacity, perhaps 93.5 or so when using WW Super headstamp brass. 7mm Valkyrie I call it. My standard load for the 180 Hybrids is 86.0 gr RL33 with a CBTO length of 2.920 using the Hornady gauge. That's a .020 jump in my chamber. This load shows belt diameter expansion of .001-.002. Moving up a grain to 87.0 shows another .001-.002 of belt growth so I backed it down to 86.0 again. The primer pockets have stayed tight over 3 loadings at this level thus far. Case head marks show just a hint of flow into the ejector hole. Primer cups are not totally flattened, either, and cratering is very minimal. This is good for 3250 fps in my 28" barrel. Retumbo was a bit too fast for max velocities using this combination of bullet and case. Maybe about right for 150s. Ran some 120 Ballistic Tips with IMR7828 and was getting 3850+ fps but with stronger pressure signs than I like. 82.0 gr is the downsized version that is waiting on my bench. The barrel heats up QUICKLY using large loads of 7828. I plan to use it for water jug exploding but it would also be a death ray on predators. I have some 162 AMAX loads to try as well with RL33. I'm also now playing with RL50 and the 180s. Haven't tried any 195 EOLs yet. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone own a 7mm 300 Win Mag?
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