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In my past I owned and used a 7MM Rem mag, a 7MM Weatherby Mag, two 300H&H mags, three 308 Norma Mags,
a 300 Winchester mag, a 300 Weatherby Mag and a 30-378 Weatherby mag.
All worked fine with good bullets and all gave me unsatisfactory results when I'd use bullets that would not hold together well enough to give deep and straight penetration.

So with 60 years of hunts behind me in 9 US States and in 4 other countries, with enough kills that I have lost count long ago from many different rifles and MAN MANY MANY different bullets I have concluded that the cartridge case is far less important then;
#1 your ability to hunt and shoot well
and #2 the integrity of the bullet used.

As a side note, of all the big 7s and 300s listed above I have only 1 left, a Mauser in 300H&H. And I kept it not because it was a 300 H&H but because it's a classic style of Mauser hunting rifle made the right way. I love the old gun.
(Although the old original "300 Magnum" or Super 30 if you prefer, is still an excellent game getter with 200 grain Nosler Partitions in it)

But try as I might to see it different for several years, when I was 100% honest with myself I can't say my big 7s ever did anything any better then my 270 Winchesters, and none of my 300 mags actually showed me any great advantage in their ability to put bag game on the ground in a quick fashion much better (or any better) then a good 30-06 ------ assuming all had bullets that held together.

I am a lover of fine guns and I also have a keen interest in various cartridges and have been that way for over 1/2 a century. But when I looked at the kills I have made and the kills I have seen made (I was a guide for years, so I saw probably 7-10 times more kills then I made myself and I myself made a LOT of them) I just can't tell anyone that the fast 7s and fast 30s truly have the magic that the advertisers tell us all about.

Nothing wrong with any of them. Just nothing all that much more "right" then what we've had for around 100 years.
Many shooters ascribe a religious dedication to what they own, and that causes hate mail to flow in from those I tell these things to, but with the experience I have I can't say I see what I was told I'd see over and above the killing performance of the 7X57 280 Remington (and 270 Winchester) and the old 30-06.

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