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.270 win vs the world Ballistics

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2007 at 20:34
pyro6999 View Drop Down
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lets compare the .270 to a bunch of stuff (ballistics wise) for fun

 

25-06 vs .270 not really a good comparison because of weight diff in the bullets but i'll do it anyways

 

25-06 117gr 3310 fps 2512 ftlbs @ muzzle      @ 100yds 2855 fps 2117 ftl bs   @300yds  2384 fps 1476 ftlbs

.270 win 130 gr 3060fps 2700 ftlbs @ muzzle  @ 100yds 2800 fps 2265 ft lbs   @300 yds 2330 fps 1565 ftlbs

 

.257 weatherby 117 gr 3400 fps 3007 ftlbs  @100 2984fps 2320 ftlbs  @300 2240 fps 1302 ftlbs

.270 win   130 gr 3060fps 2700 ftlbs    @100 2800 fps 2265 ft lbs   @300 2330fps 1565 ft lbs

 

.260rem 140gr  2750fps 2350ftlbs  @100 2570fps 2045ftlbs @300 2220fps 1535ftlbs

.270win 140gr 2925fps  2659ftlbs  @100 2667fps 2265ftlbs  @300 2330fps 1565ftlbs

 

6.5rem mag 130gr 3000fps 2600ftlbs  @100 2800fps 2300ftlbs  @300 2467fps 1750ftlbs

.270win 130gr 3060 fps 2700ftlbs  @100 2800fps 2265 ftlbs  @300 2330fps 1565ftlbs

 

.264 win mag 140 gr  3030 fps 2854 ftlbs   @100 2782 fps 2406 ftlbs  @300 2326fps 1682 ftlbs

.270win  140 gr  2925 fps 2659 ftlbs   @100 2667fps 2211 ftlbs   @300 2152fps 1495 ftlbs

 

.270wsm 140 gr 3125 fps 3035 ftlbs  @100 2865 fps 2550ftlbs  @300 2386fps 1769ftlbs

.270 win 140gr  2925 fps 2659 ftlbs  @100 2667fps 2211 ftlbs  @300 2152fps 1495tlbs

 

270wby 140gr 3300 fps 3385 ftlbs  @100 3077fps 2943ftlbs  @300 2663fps 2204 ftlbs

.270 win 140gr  2925fps 2695ftlbs  @100 2667fps 2211ftlbs  @300 2152 1495ftlbs

 

7-08 140gr 2950fps 2700 ftlbs  @100 2660fps 2205ftlbs  @300 2140fps 1590ftlbs

.270 win 140   2925fps 2695ftlbs  @100 2667fps 2211 ftlbs  @300 2152fps 1495ftlbs

 

.280rem 140gr 3150fps 3085 ftlbs  @100 2850fps 2520 ftlbs  @300 2300fps 1650ftlbs

.270win 140 2925fps 2695ftlbs  @100 2667fps 2211ftlbs  @300 2152fps 1495ftlbs

 

7mmmag 140gr 3250fps 3259ftlbs  @100 3044fps 2860ftlbs  @300 2657fps 2178 ftlbs

.270win 140gr 2925fps 2695ftlbs @100 2667fps 2211ftlbs @300 2152fps 1495ftlbs 

 

7wsm 140gr 3225fps 3233ftlbs @100 3008fps 2812ftlbs @300 2603fps 2106ftlbs

.270win 140gr  2925fps 2695ftlbs @100 2667fps 2211ftlbs @300 2152fps 1495ftlbs

 

7wbymag 140 3350fps 3450ftlbs @100 3100fps 3000ftlbs  @300 2850fps 2500ftlbs

.270win 140gr 2925fps 2695ftlbs  @100 2667fps 2211ftlbs  @300 2152fps 1495ftlbs

 

30-06 150gr 3100fps 3200ftlbs  @100 2860fps 2725ftlbs  @300 2414fps 1941ftlbs

.270win 150gr  2850 fps 2705ftlbs  @100 2660fps 2355ftlbs  @300 2300fps 1760ftlbs

 

.308win 150gr 3000fps 2997 flbs  @ 100 2765fps 2433 ftlbs  @300 2328fps  1805ftlbs

.270win  150 gr  2850fps 2705ftlbs  @100 2660fps  2355ftlbs  @300 2300fps 1760ftlbs

 

300win mag 300 wsm 300wby 300 h&h dont even need to chart them



Edited by pyro6999
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 00:32
303Guy View Drop Down
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Umm...... Pyro,   a few errors crepted in there!  And then you left out the all important 260 Remmie.

 

Would you mind doing a similar comparison using different bullet weights in the same calibre?  It might be revealing!



Edited by 303Guy
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 06:37
pyro6999 View Drop Down
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no errors there its all number for number from the same ballistic chart,

 

which calibers and which bullet weights are you looking at?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 13:41
koshkin View Drop Down
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One of the calibers you mention pyro, is the 280Rem (which I prefer to the 270).  3150fps with 140gr is a little bit hotter than most loads.  WIth factory loads that would be about the right speed for Federal High Energy or Hornady Light Magnum loads.  That would not be easy to duplicate with handloads without exceeding the SAAMI pressure limits.

In my (perhaps not very extensive) experience, most 140gr loads in the 280Rem run around 3000 to 3050 fps, which is still faster than the 270.  For just about anything I may need to do with my 280Rem, though, I found that factory Federal loads shoot really well in my Tikka.  I stocked up with 140gr TBBCs when they high energy ammo was on close out (this the 2150fps load) and have enough 150gr Partitions that run right at 2900fps to last me for a while.

As for the comparison between 270Win and 280Rem, a couple of things need to be kept in mind. Because 280Rem was originally for a somewhat weaker actioned auto loader the SAAMI pressure limit for it is 60000psi, while for 270Win it is 65000psi.  Loaded to the same pressure 280 Rem is 100-150fps faster,depending on bullet weights.  The speed difference is larger for heavier bullets than for lighter ones.  Overall, loaded to the same pressure 280Rem with 150gr bullet is about as fast as the 270Win with 140gr bullets.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 13:51
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Oops - I must be blind!  You did include the 260. 

 

7-08 140gr 2950fps 2700 ftlbs  @100 2660fps 2205ftlbs  @300 2140fps 1590ftlbs 

.270 win 140   2925fps 2695ftlbs  @100 2667fps 2211 ftlbs  @300 2152fps 1495ftlbs

 

I load for the hornet but not too many members would be interested in that one but the 308 or 30-06 would be interesting to many I should think.  Some folks choose a lighter, faster bullet for its flatter trajectory.  In my hornet, for example, the slower, heavier bullet has a flatter trajectory and shorter flight time at ranges beyond 150yds or so and higher striking velocity and energy (depending which bullet style one compares). 

 

 

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 14:09
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 Koshkin, you bring up some good points, too.  One thing we always need to keep in mind, is that it is nearly impossible to completely duplicate every variable when comparing loads. Bullet weight vs. velocity is relatively meaningless if we ignore chamber pressures when making comparisons, which you allude to.

 Even when comparing two bullets of the same caliber and same weight, but different manufacturers, one may be able to reach higher velocities before exceeding pressure limits, simply because of such characteristics as jacket hardness and/or thickness, bearing surface, lubricity of jacket material, and on and on.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 14:37
pyro6999 View Drop Down
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Originally posted by koshkin koshkin wrote:

One of the calibers you mention pyro, is the 280Rem (which I prefer to the 270).  3150fps with 140gr is a little bit hotter than most loads.  WIth factory loads that would be about the right speed for Federal High Energy or Hornady Light Magnum loads.  That would not be easy to duplicate with handloads without exceeding the SAAMI pressure limits.

In my (perhaps not very extensive) experience, most 140gr loads in the 280Rem run around 3000 to 3050 fps, which is still faster than the 270.  For just about anything I may need to do with my 280Rem, though, I found that factory Federal loads shoot really well in my Tikka.  I stocked up with 140gr TBBCs when they high energy ammo was on close out (this the 2150fps load) and have enough 150gr Partitions that run right at 2900fps to last me for a while.

As for the comparison between 270Win and 280Rem, a couple of things need to be kept in mind. Because 280Rem was originally for a somewhat weaker actioned auto loader the SAAMI pressure limit for it is 60000psi, while for 270Win it is 65000psi.  Loaded to the same pressure 280 Rem is 100-150fps faster,depending on bullet weights.  The speed difference is larger for heavier bullets than for lighter ones.  Overall, loaded to the same pressure 280Rem with 150gr bullet is about as fast as the 270Win with 140gr bullets.

ILya

koshkin read it again i wouldnt ever forget one of MY faves here i put the .280 in there read it again, i own one and love it and i totally agree with you but check the post again the data is in there i promise

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 14:41
pyro6999 View Drop Down
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in this table i used info from  the same company in each comparison so if the first load i picked was from federal the .270 i was comparing it to was also from federal, some of the data is from remington and some is from winchesher(wsm cals)

 

i will post more comparisons as they are requested.the .308 i will add the 30-06 is already there.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 17:00
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pyro, the only 280Rem 140gr load from Federal that goes 3150fps is the "High Energy" load, and I thin they discontinued it anyway (I have about 20 boxes of it though).

if you want to be fare, you have to also look at federal's HE load for 270Win which has a velocity of 3100fps with 140gr TBBC.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 17:04
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So from this, we can conclude that the .270 is the stellar performer you've been preaching about all along and we should all own at least one, if not two... right, Mr. O'Connor?!!!

Edited by RifleDude
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 17:24
pyro6999 View Drop Down
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you would be correct there ilya, there fastest current fed  140 gr load only goes 3000fps but hornady's light mag loads will go 3150fps.

Edited by pyro6999
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 17:56
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For al the reasons ILya stated, I really like the 280 over the 270. Granted mine is an Ackley. I don't think anyone could muster up a legitimate agrument that the 280 would "outperform" the old 270, certainlyas far as field results are concerned anyway. I also like the bullet selection in the 7mm class more so than the 270. Just my 2c.

 

Roy

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2007 at 21:04
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i agree with you roy that no deer or person would know the difference in the end, but on paper  even a 100 fps edge means a victory in my book. the ackley steps this up even more and its to bad more ackley imp arent readily available in mass production cause some of them are real neat.
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