.30 caliber magnums apples to apples - The HuntingPA.com Outdoor Community
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post #1 of 93 (permalink) Old 09-05-2016, 01:57 PM Thread Starter
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.30 caliber magnums apples to apples

Just a comparative post at max velocities as found in the load data from 4 powder brands. These numbers are for a 180 grain bullet and rounded to the nearest 10 fps. tossing in the .308 Win and .30-06 for comparison.

.308 Win......2680 fps...2871 ft/lbs
.30-06........2840 fps...3225 ft/lbs
.30 RCM.......2930 fps...3432 ft/lbs
.300 RSAUM....2950 fps...3479 ft/lbs
.300 WSM......2990 fps...3574 ft/lbs
.308 Norma....3020 fps...3646 ft/lbs
.300 Win......3040 fps...3695 ft/lbs
.300 H&H......3070 fps...3768 ft/lbs
.300 Wby......3170 fps...4017 ft/lbs
.300 RUM......3300 fps...4354 ft/lbs
.30-.378 Wby..3460 fps...4786 ft/lbs

To be fair, I omitted the data from one powder in particular, which puts the full-length cartridges well out of reach of the short mags. But there wasn't data listed for ALL of them so I tossed the high numbers out.

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post #2 of 93 (permalink) Old 09-05-2016, 02:17 PM
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Re: .30 caliber magnums apples to apples

IMHO its not how quick it gets there its how hard it hits on arrival
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post #3 of 93 (permalink) Old 09-05-2016, 04:15 PM
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Re: .30 caliber magnums apples to apples

All things being equal, i.e. bullet weight, construction, etc. If it gets there faster, it's going to hit harder. Common sense. That's whole point of a Magnum. Heavier bullets athe higher velocities.

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post #4 of 93 (permalink) Old 09-05-2016, 06:55 PM
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Re: .30 caliber magnums apples to apples

I don't know how the H&H bested the Win Mag?

"A 30-30 is all you need. If you use a 30-06 you'll just hit a tree" -My Grandpa
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post #5 of 93 (permalink) Old 09-05-2016, 08:53 PM
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Re: .30 caliber magnums apples to apples

Yeah, that seems odd. The Win Mag should be able to develop around 100fps more than the H&H, maybe a bit more.
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post #6 of 93 (permalink) Old 09-05-2016, 10:24 PM Thread Starter
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Re: .30 caliber magnums apples to apples

Comes from the short neck on the.300 Win casing. There's only about 1 grain H2O difference case capacity between the two. But when getting into the heavier (read longer) bullets, the bullet base begins to extend below the bottom of the .300 Win case neck and intrude into the space where powder could be. It would be even more pronounced with a 200 grain bullet and is the reason you never see .300 Win 220 grain ammo.

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post #7 of 93 (permalink) Old 09-05-2016, 10:28 PM
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Re: .30 caliber magnums apples to apples

Man the ol 06 isnt really that far behind some of those im very surprised in that!
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post #8 of 93 (permalink) Old 09-05-2016, 11:34 PM
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Re: .30 caliber magnums apples to apples

Wasn't the 30 RCM developed to generate that velocity from a short barrel?

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post #9 of 93 (permalink) Old 09-05-2016, 11:46 PM Thread Starter
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Re: .30 caliber magnums apples to apples

Not THAT velocity.

As far as I know, these are all instrumental velocities from 24" test barrels. So real life velocities for the RCM and short mags will likely be lower than shown and velocities from the others which may be 26" - 28" barrels will likely be higher.

Actual chronograhed data from 180 gr Hornady factory ammo out of the 20" barreled Ruger runs 2800-2850 fps. Far below the instrumental test velocity.

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post #10 of 93 (permalink) Old 09-06-2016, 12:20 AM
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Re: .30 caliber magnums apples to apples

Remember energy is NOT proportional to increase in velocity...just because one is a hundred feet faster or slower doesn't mean it hits with one hundred more foot pounds of energy.. Old Strutt needs to put the energy difference chart up, you'll really be shocked if he does !!!I'll bet that we a at 3500 is almost twice the good ole .308 win, even though it's approx 900 fps faster !!
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