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Don Fischer's picture
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.270 win handloads for Elk/Mulies in the mountains
WesternHunter wrote:
Don,
Ya may want to re-check the ballistic tables for the 150 gr .270 and the 150 gr .30-06. Reload manuals and tables from various ammo makers show nearly same velocity for both. With certain hand loads there can be differences of up to 150 ft/sec between them. I agree that the .30-06 has more potential for a bit more powder and a bit higher velocity due to the shorter bullet of the 150 gr .30-06, but they are usually the same velocity when loaded.

You'll get the same energy transfere when you throw the same grain, shape, and velocity of bullet regardless of bullet diameter. The difference in these situations is sectional density.

With reloading you certainly can make a 150gr 270 shoot with a 150gr 30-06. What you can't do is make it keep up when you go after the heaviest loads. Not possible because of the bore size. You'll notice in cartridges with the same parent case that the larger the bore size, the lower the pressure at a given charge. The difference isn't great but exists. where the advantage goes to the 270 with the 150gr bullet is that it is a heavier constructed bullet with better ballistic qualities. Those ballistic qualities exist because of the length of equal length bullets. You'll find the same is true with all cartridges based on the same parent case. The bigger bore reduces the pressure somewhat.

You'll notice that the 130gr bullet in each has about 100fps advantage in the 30-06. The 270 is generally said to reach 3200 fps and may well be able to but then the 30-06 will do 3300 fps if pushed. In either case, pressure must be suspect. The same 130gr bullet from a 25-06, wildcat bullet's, won't get 3100fps without a very long barrel and high pressure.

keep in mind that, all things being equal, as bullet dia increases, pressure decreases.

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.270 win handloads for Elk/Mulies in the mountains

I think the 160 gr partition is an underused bullet. You should get great penetration with it, the Ballistic Coefficient isn't bad at all (.434). And as long you keep the impact velocity above 1800 or so fps, your expansion should be good too.
I had read that spitzers often have trouble expanding properly below 1900 fps, but since that is a semi-spitzer, it probably buys you another 1-200 fps.
The sectional density is ridiculous for a .270, at .298 its about on par with a 200 gr 30 cal
Nosler lists muzzle velocities at approx 2750 fps with either RL 19 (53.5 gr), IMR 4350 (51 gr), N 165 (52 gr).

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.270 win handloads for Elk/Mulies in the mountains

okay so what is the advantage of having a 30 06 over the 270 curious thx

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.270 win handloads for Elk/Mulies in the mountains

The availability of heavier bullets and a bit larger entrance hole.

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.270 win handloads for Elk/Mulies in the mountains

thats it??

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.270 win handloads for Elk/Mulies in the mountains

Robert,

Yes that really is it. The difference betwen the two is quite marginal until you start throwing bullets above about 160 grains or so. Supposedly the 270 is a bit flatter shooting and of coarse the 06 has loadings from 220 grains or so down to 130 or thereabouts. You really can't go wrong with either one in my opinion. If I were to have to choose I would take the 270 if I were going to reload and the 06 if I were not. The 06 probably has more commercial ammo avaliable in more choices than any caliber ever.

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.270 win handloads for Elk/Mulies in the mountains

then why didnt the military use the 270 for sniping???

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.270 win handloads for Elk/Mulies in the mountains

Economics Robert, economics. The lowest bidder wins !

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.270 win handloads for Elk/Mulies in the mountains

Like Hammer said. Economics. The military has had tens of thousands of 30-06 rounds lying around since about...well....1906. Much the same reson we use the 308 today. You use what's available to you. Not that the 06 was (or is) a bad choice. Six of one half dozen of another. Both great cartriges though.

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.270 win handloads for Elk/Mulies in the mountains

I have a chart that has a 160grain 270cal Nosler Part. with 57grains of H450 going 2866fps.

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