270 Win For Long Range Shooting

[bigngreen]

Originally Posted by Downright Dave

Hi All,

I arrived a Long Range Hunting when I googled, "Chamber Pressure"

See my post telling about the .270 I am building. It is a couple of posts back.

I want to learn as much about Long range Rifles as quickly as possible.

Please explain why the reviewers give the Savage trigger such high marks.

Thank You,
Dave "The Reluctant Lemming" Ijams

You should start a thread with your questions, you'll have better odds of getting you questions answered!!!! Anything with a 270 has to be good don't it!!!

[Downright Dave]

Hi,

Thanks for getting back to me.

Your "G-Day" makes me ask, are you "Strine"?

Your answer makes perfect sense to me, it's simply that I've only been introduced to LRH a week ago and every thing is new to me about the subject*

I design specialized wheel chairs for a living and work on "State of the Art" designs in the high performance racing engine and gun design fields.

I worked on a Flying Saucer for Avro Aircraft of Canada in 1957. Thirty-seven feet in diameter, 3750 kph design speed. Compressor and rotor wheels nominally eight feet in dia. They were of "Squirrel Cage" configuration.

I left the project before it was completed to work on the Bevatron at Lawrence
Labratories in Berkeley. It was the largest particle accelerator in existence at the time. Nobel Laureate Donald Glazer, was making headlines with his "Bubble Chamber" while I was there.

*I believe this sport grows out of man's desire to, "Smite thine enemies, a blow from a great distance", as mentioned in the Bible.

FWIW, it's "Hear" not "Here".

Please feel free to write more.

Thanks,
Downright Dave

[Downright Dave]

How do I start a thread?

Here is what opened my eyes:
The Merits of the .270


Chuck Hawkes wrote an article saying that, not only was the .270 Win. one of the flattest shooting of the game cartridges, it had less recoil, less muzzle blast, and ammunition cost much less than for the others. I checked the Hornaday Tables and below is what I found:

A list of the Ten Flattest Shooting Game Cartridges


Taken from Hornaday’s Ballistic Tables at the following web address:

http://www.hornady.com/assets/files/...nterSpread.pdf


Cartridge Bullet (grs.) 100 yds. 200 yds. 300yds 400 yds.

1) .300 Win. Mag. 150 1.0 0 - 5.1 - 15.0
2) 7mm Wby. Mag. 139 1.1 0 - 5.2 - 15.2
3) .300 Wby. Mag. 150 1.0 0 - 5.2 - 15.3
4) 7mm Rem. Mag. 139 1.3 0 - 5.5 - 15.9
5) .270 Win. 130 1.2 0 - 5.7 - 16.7
6 ).50 BMG 750 1.4 0 - 6.4 - 18.1
7) .338 Win. Mag, 185 1.4 0 - 6.4 - 18.8
8) .30-’06 Spgfld. 150 1.4 0 - 6.4 - 18.9
9) .338 Lapua 250 1.5 0 -6.6
- 18.8

10) .308 Win. 150 1.5 0 - 6.9 - 20.0


I see that the 400 yds. column got shifted over to the far left.



The point is that the plain old garden variety cartridge that Jack O'Connor told us was good has, indeed, stood the test of time and can hold it's head up in some mighty fast company.

[FEENIX]

Originally Posted by Downright Dave

How do I start a thread?

There's a "new thread" tab on the bottom left of every forum, click that and every prompt/fields are self explanatory.

[Downright Dave]

Thanks, Feenix.

I voted for "Freedom" and "Guns". I didn't vote on the money issue, because
TPTB have arranged it so that to make money, we often have to do the wrong
thing.

I am only proud of my country when she does the right thing.

Lately, we've been making war on the wrong people, IMHO.

Downright Dave

[landcbeitner]

Down Right Dave... I've sent you a Private Message. You can check it in the upper right portion of the page. If you're starting out there is plenty of reading that can be done in these forums. You can use the search function to find specific information. Specific questions can be asked by starting a new thread as described before.

The type of long range shooting mentioned most often regarding hunting rifles online (like the Chuck Hawkes article you mentioned) are quite different from long range shooting you will find discussed in these forums. Often we sacrifice closer range trajectory (out to 400 or 500yds) for longer range trajectory and especially wind drift. We often shoot heavier bullets with higher ballistic coefficients... they start out slower than more conventional projectiles but more than make up the difference later.

[Pistol packer]

downright dave,
welcome to LRH. i would suggest that you read PO ACKLEY's two volume set on his experiments before you reinvent the wheel. with your expertise and knowledge i would assume that you will catch up in a year or so. ackley was the most prolific wildcatter and experimenter of his days (govt refused to take him in WW II because they saw his work as too valuable). he covers cases, barrels, etc. like no one i have ever read, as well as killing power (he states that M.E. is wasted time-the killing produced by a projectile currently is in direct relationship to the rotational spin of that projectile which is relatively unaffected by distance). also he found out that the 270 win was basicly at the optimal case capacity of NTG based powder to propell a projectile. it is considerably overbore already and his attempt to get more velocity with the ackley improved 270 produced one of his "duds". it got virtually no improvement with the 6-8 % more powder. yes, you can push it faster, but at the expense of barrels and a great deal of more powder.
conversely, the 280 ackley improved is only 284 over 277 diameter from the 270 yet shows 100 + fps improvement with a similar increase in powder and is of one of the most underrated cartridges created. it can appoach and equal the 7 mm mag. thus illustrating that even a small increase in bore size can greatly decrease the overbore problems and give much better results. no matter how much can be juggled here, the maximum is 6800 FPS with any NTG based powder as that is as fast as it can expand and this was shown when the army necked a 20 mm cartridge to .22 cal. for all practical purposes that eliminates our currant rifle/projectile system as we know it because it would burn barrels out in an afternoon. therefore, they went to the railgun system to get 40,000 FPS and encountered a whole new set of problems.
a friend of mine who is a very renown barrel maker spent several years and many dollars trying to improve the 270 as he also was very interested in this caliber. he found what po ackley did in 1930-40's. the 270 win is near max for performance in that cal. and overbore already.
doc