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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Why the 7mm Rem Mag?
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<blockquote data-quote="CONatureBoy" data-source="post: 2296693" data-attributes="member: 118769"><p>Wow you got beat up for asking a basic question. Oh well.</p><p></p><p>Both calibers use the same case, just with a different neck size. So powder capacity isn't the difference. That leaves bullet size and exterior ballistics. Look at the range of bullet weights that a given bullet manufacturer markets for each caliber. In Bergers (for example) the 7mms go up to 190 grains, if you're willing to use a barrel with a fast-enough twist rate to stabilize them. The 300 WM goes up to 250 grains (same twist-rate caveat), though as a practical matter you don't get any benefit in (even long range) retained energy with anything above 210-230 grains, at least with a SAAMI-standard chamber. (My 300 RUM shooting a 210-grain VLD is flatter and retains more energy than a 230-grain Berger from the same rifle, out to over 500 yards. The differences are still almost theoretical out to 1,000 yards.) The differences in trajectories are modest; a skilled shooter could do about as well with either, properly loaded, at longish range. So the difference is the marginal extra bullet mass and retained energy at longer ranges, trading a little more kick for a little more oomph. </p><p></p><p>That's a boring, engineering-facts type answer. My personal-preference answer is, I've hunted a 7mm Rem. Mag. and a 300 RUM (which might be 50-100 fps faster than the 300 Win. Mag.). I like having a little more mass and energy downrange, and I don't mind the kick. (I currently also hunt a 280 AI, shooting a 180-grain 7mm bullet at 7mm Rem. Mag. speeds. I like that even better than the 7mm Rem. Mag. I get 3,000 fps, and it kicks less and uses a bit less powder.) Now that the 190-grain bullets are available, if I had to do it over again, I'd probably build a fast-twist 7 around the Berger 190-grain bullet.</p></blockquote><p></p>
[QUOTE="CONatureBoy, post: 2296693, member: 118769"] Wow you got beat up for asking a basic question. Oh well. Both calibers use the same case, just with a different neck size. So powder capacity isn't the difference. That leaves bullet size and exterior ballistics. Look at the range of bullet weights that a given bullet manufacturer markets for each caliber. In Bergers (for example) the 7mms go up to 190 grains, if you're willing to use a barrel with a fast-enough twist rate to stabilize them. The 300 WM goes up to 250 grains (same twist-rate caveat), though as a practical matter you don't get any benefit in (even long range) retained energy with anything above 210-230 grains, at least with a SAAMI-standard chamber. (My 300 RUM shooting a 210-grain VLD is flatter and retains more energy than a 230-grain Berger from the same rifle, out to over 500 yards. The differences are still almost theoretical out to 1,000 yards.) The differences in trajectories are modest; a skilled shooter could do about as well with either, properly loaded, at longish range. So the difference is the marginal extra bullet mass and retained energy at longer ranges, trading a little more kick for a little more oomph. That's a boring, engineering-facts type answer. My personal-preference answer is, I've hunted a 7mm Rem. Mag. and a 300 RUM (which might be 50-100 fps faster than the 300 Win. Mag.). I like having a little more mass and energy downrange, and I don't mind the kick. (I currently also hunt a 280 AI, shooting a 180-grain 7mm bullet at 7mm Rem. Mag. speeds. I like that even better than the 7mm Rem. Mag. I get 3,000 fps, and it kicks less and uses a bit less powder.) Now that the 190-grain bullets are available, if I had to do it over again, I'd probably build a fast-twist 7 around the Berger 190-grain bullet. [/QUOTE]
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Why the 7mm Rem Mag?
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