270 rules 30-06

New Avon Arms
Ah yes, But. And BOTH would be more flat in trajectory than a 110 grain bullet from a .35 Whelen.

As the .308 bullet has a larger base area than the .277 bullet then the larger bullet will make more efficient use of the powder charge needed and have less recoil. Same a in an air rifle and the old .22 vs .177 argument. The .22 in a PCP gets more shots per "fill" to have the same velocity as a .177 pellet of the same weight as it is more (having that larger diameter base area) efficient.

So the writer has made IMHO a daft comparison as by using a 110 grain bullet he opens himself to the riposte that a .25/06 would be even better!
 
enfieldspares said:
Ah yes, But. And BOTH would be more flat in trajectory than a 110 grain bullet from a .35 Whelen.

As the .308 bullet has a larger base area than the .277 bullet then the larger bullet will make more efficient use of the powder charge needed and have less recoil. Same a in an air rifle and the old .22 vs .177 argument. The .22 in a PCP gets more shots per "fill" to have the same velocity as a .177 pellet of the same weight as it is more (having that larger diameter base area) efficient.

So the writer has made IMHO a daft comparison as by using a 110 grain bullet he opens himself to the riposte that a .25/06 would be even better!
Click to expand...
Yep, good points on efficiency.

I think the standard practice when comparing catridges of different calibers these days is to compare data for bullets not of equal weight but of more or less equal sectional density and ballistic coeffecient. Ideally when using the same type of bullet (so a barnes ttsx or sierra GK etc).
And this does make some sense as those values relate more directly to the projectiles ability to maintain its speed and trajectory + buck the wind and for its the ability to penetrate effectively upon impact (if the same type of bullet is used in both cartridges).

Now going with that, it is true that a 30 cal bullet of the same weight as a 277 cal is indeed more efficient in terms of obtainable speed and lessened friction if the same amount of power is put behind it.
However it is also true, that in order for the 30 cal to match the 277 cal bullets SD and BC it likely needs to weigh about 30 grn more, thus suddenly losing its power and speed advantage it had, and acutally likely requiring more power and recoil to match the speed of the smaller cal if matching it's sd and bc. However if it does that, it will be hitting the target with more surface area and mass than the 277. So something for something and there is no free lunch. 🤠
 
The little 6.5 creedmoor with 140 ELDM 20" barrel can have more Energy at 500yds than 270/30-06 with those 110gr. Just shows how important choosing the right bullet can be. Put a 208 ELDM in the 30-06 and it will leave the 270 with just about any bullet for dead.
edi
 
Just sit back and enjoy someone writing about long proven traditional cartridges.

Just about every article written in the US is about whatever is the newest latest greatest. “The .123 Tallywhacker has just been released with some outstanding velocities. Using a 50 BMG case necked down to .12, and the shoulder bumped up, it takes 4 million grains of powder and achieves velocities of half the speed of light. Trials on prairie dog result in 1/2 acre bomb craters and complete vaporization of the target……..
Stop the presses…the .123 Tallywhacker has been superseded but the .321 Super duper, using a necked down 40 mm grenade launcher case. With this new combination it surpasses the Tallywhacker and achieves 5/8th the speed of light.
 
Cootmeurer said:
Just sit back and enjoy someone writing about long proven traditional cartridges.

Just about every article written in the US is about whatever is the newest latest greatest. “The .123 Tallywhacker has just been released with some outstanding velocities. Using a 50 BMG case necked down to .12, and the shoulder bumped up, it takes 4 million grains of powder and achieves velocities of half the speed of light. Trials on prairie dog result in 1/2 acre bomb craters and complete vaporization of the target……..
Stop the presses…the .123 Tallywhacker has been superseded but the .321 Super duper, using a necked down 40 mm grenade launcher case. With this new combination it surpasses the Tallywhacker and achieves 5/8th the speed of light.
Click to expand...
 
What he almost came to is that heavy for calibre performs best and if he were using say 150gr in 270 and 220gr in 30-06, the 30-06 would have outperformed 270 by the same margin and again outperformed the 110gr by a mile.

Of course using 220gr bullets not only makes it better for better long range, it also makes it a usable at shorter ranges.
 
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