150gr bullets

[elkslayer308]

Why does a 270-150grainer thump harder than a 30-06-150grainer at the same velocity? I load 150's in my 06 and they just dont kill elk like a 270-150 does. I shoot them both well and just cant understand it. I dont want to sell my 06 but i am thinking of loading it with 165's to take up some slack. I am definately buying a 270 to start hunting with though.

 

[CamoWildcat]

Well, you didn't spell out any particulars, so I will assume you mean they have the same muzzle energy leaving the barrel at the same speed. Since MOST 270 cal 150 grain bullets have a higher BC than 30 cal 150 grain bullets, the 270 will maintain more speed down range - therefore more energy since the mass is the same.

 

[CamoWildcat]

And if you are buying a 270, I recommend the 270 WSM.

 

[JD338]

You need to compare apples to apples. 270 150 gr PT vs 308 180 gr PT.

270 Win 30-06
150 gr PT 180 gr PT
BC .465 BC .474
SD .279 SD .271
MV 2900 MV 2700
ME 2802 ME 2914
200 yd E 2082 200 yd E 2115

JD338

 

[FOTIS]

And if you are buying a 270, I recommend the 270 WSM.

yup

 

[elkslayer308]

Even though I like the cartridege, I have had one, the gun it was housed in was cheap and didnt function as well as it should have. It was a remington 700 SPS-so dont buy one-feeding and ejection problems. Thats another reason I want a 270 Winchester in stead of the magnum.

 

[JD338]

elkslayer308,

The '06 class of cartridges are smooth feeding, no doubt.

The 270 Win is a classic round but on the low end for elk. You need the heavier bullet weights to break bones and give you the penetration required on quarting shots.

You might want to reconsider some of your options in the '06 case size.

.284 280 Rem 160 gr, 175 gr
.308 30-06 180 gr, 200gr
.338 338-06 210 gr, 225 gr, 250 gr
.358 35 Whelen 225 gr, 250 gr

JD338

 

[remingtonman_25_06]

The reason has already been stated, they both shoot them about the same velocity, but since its 27 cal vs 30 cal, the smaller diameter bullet has to be longer, therefor giving it a higher BC. In the long run, that higher BC will help maintain the velocity, which will make it hit harder, retain more velocity, and have less wind drift.

I just found a decent load out of my 270 today, 150g sbt, 57.5g h4831sc, fed 215 primer, w-w case, OAL=3.410" 5 shots at 200 gave me a 1.75" group, 3 of the 5 were touching, so that makes it a .5" 3 shot group. Velocities were 2922, 2916, 2925, 2917, and 2927. I am totally satisfied with this, and will now take it to the 500 yard target, and the 800 yard gong. If you run the numbers, it has enough power to harvest a deer at 800 yards, and elk at 600.

The 270 wsm is a nice cartridge, I had one in a savage stainless/synthetic. Couldn't get it to shoot worth a shit, so I sold it. Yah the velocity was better buy 200fps or more, but with the accuracy I was getting with it, I wouldn't have trieda shot at deer farther then about 200 yards with it. I wouldn't mind having one in a winchester and see how it does, but you dont need a magnum for deer.

 

[Eagleye]

This 270/150 vs 30/06 150 is comparing two very similar items. It is true that the 270/150 sheds velocity at a slower rate than does the 30/150. However, you can start the 30/150 about 100 fps faster than you can the 270/150 in similar length barrels. So It's a tradeoff, and the difference in "thump" is more imaginary than real. I own a couple of each, and any advantage lays with the '06. Again, I would choose a heavier bullet in the '06, simply to achieve the better BC and Sectional density. Regards, Eagleye.

 

[Reloder28]

From a different point of view:

The 150 gr. 308 caliber bullet has a larger frontal area than the 277 150 gr. By the time the 308 150 smacks its target , it lacks the momentum to continue to penetrate. The bullet expands more than the 277 and without the longer rear shank the 277 has to drive it thru, the 308 150 simply slows the bullet much faster, thereby losing its momentum. The same concept as a parachute on a Top Fuel Dragster.

As Jd338 stated, the 150 277 is comparable to the 180 308. Stand those two side by side and you'll see what he means.

Capiche ??

 

[FOTIS]

with 150 gr as already stated:

308 bigger diameter
270 penetrates more

given both bullets are of same construction.

 

[Juggernaut76]

As previously stated, one cannot accurately compare the performance of two or more bullets of equal weight but different caliber. That is, with the exception of muzzle energy-two equal weight projectiles traveling the same speed will have be carrying the same amount of energy. Likewise, ballistic coefficeint has little to do with a meaningful comparison. A more conclusive means of comparing different-caliber bullets is by evaluating those projectiles with very similar sectional densities. Case-in-point: generally, a 150gr .277" bullet is fine elk medicine while a 150gr .308" bullet (save the Barnes X) is probably marginal at best.

 

[FOTIS]

And if you are buying a 270, I recommend the 270 WSM.

hands down!!!!