Browning: Factory Fast-Twist .270 Winchester

[Chuck R.]

The higher BC 150 ABLR can be pushed at the same velocity as the 150 Partition, and maybe faster if long loaded/throated.

Even the 165 gr. ABLR is no velocity slouch and has an even better BC/SD, and brings 1,500 ft-lbs to the 600 yard line.

All from the ole .270 Winchester.

What's wrong with that?

Nothing whatsoever, which is kinda what I said in an earlier post.

But that doesn't mean that a higher velocity and higher BC doesn't have it's usefulness, which is the gist of what I took away from your comment. "But who cares about muzzle velocity in a long range hunting rifle"

Twisting dial, mil reticles (and MOA) lasers and ballistic apps are great, and do a great job when it comes to calculating and compensating for drop. Higher velocity comes in handy when it comes to drift, which is again, IMHO more challenging to compensate for.

Also velocity has a direct correlation to expansion, which is a reason why the ABLRs have a lower expansion velocity of 1300 VS the standard 1800 that Nolser designs for.

There's also a few guys still using the old MPBR type zeros. So for those guys, velocity = range.

 

[WisBorn]

I never understood why someone would argue about how effective a cartridge is compared to a cartridge of the same caliber and use a different bullets to compare???

NOSLER LONG RANGE FACTORY AMMO 150 ABLR BULLETS
270win muzzle 2850 fps/2705 f#s
500 yards 2111 fps/1484 f#s
With a 200 yards zero 40.2" of drop at 500

270WSM muzzle 3050 fps/3098 f#s
500 yards 2282 fps/ 1734 f#s
With a 200 yard zero 34.4" of drop at 500

So yes velocity matters it equals distance and more importantly energy.

 

[mshootnit]

Actually picked the 150 gr. Partition for the WSM and the same wt. ABLR for the Win., good 1:10 and 1:8 twist bullets.

And that is ~ 300

So all I have to do is run a 140 gr. Accubond in my WSM to ensure better performance than a tight twist 270 Win all the way out to at least 425 yds. I dont think you will find a bit of difference in recoil between a 270 WSM loaded with 140 gr. and a 270 Win stoked with 165 gr.

 

[Gun-Reck]

Actually picked the 150 gr. Partition for the WSM and the same wt. ABLR for the Win., good 1:10 and 1:8 twist bullets.

And that is ~ 300

So all I have to do is run a 140 gr. Accubond in my WSM to ensure better performance than a tight twist 270 Win all the way out to at least 425 yds. I dont think you will find a bit of difference in recoil between a 270 WSM loaded with 140 gr. and a 270 Win stoked with 165 gr.

You probably could.

However, with 10 grains more powder and a higher muzzle energy, there will be a difference in recoil.

No free lunch in Physics.

 

[Varminterror]

What about a fast twist 30-06?

Definitely a game changer! So I can push the 250 A-Tips out there at 1900fps, and really cut through the wind!

 

[Gun-Reck]

I never understood why someone would argue about how effective a cartridge is compared to a cartridge of the same caliber and use a different bullets to compare???...

Because the stability of the long, 150 gr. ABLR bullet is questionable in a 1:10 twist barrel, so precision may be, and the BC definitely, is degraded accordingly.

In the past, for the field, when shooting premium bullets, the 150 gr. Partition was the 1:10 twist choice.

Although, for an appropriately twisted barrel, the ABLR in that weight would be the obvious long range choice.

It's not an attempt to curve the results, but simply to qualify what comparative appropriate field options would be.

 

[Gun-Reck]

Definitely a game changer! So I can push the 250 A-Tips out there at 1900fps, and really cut through the wind!

Although it is a paper-punching bullet, outside the scope of this discussion.

 

[Varminterror]

In the most simplified terms: Muzzle velocity describes "how much with which we start." Ballistic coefficient describes "how much we keep as we go along."

Exceptionally high BC's only make a difference if there's "enough on the bullet" when it leaves the muzzle. A great example of this in the field: sub-sonic 300 Blackout loads like the 208 A-max. The 208 A-Max has a BC of 0.648G1, so leaving the muzzle at 1020fps, it has as much drop at 300yrds as my 300wm would have with the same bullet at ~1250yrds, and the same impact velocity as my 300wm load at ~3000yrds...

How much we start with AND how much we keep as we go along both matter. But there does exist an inflection point for every cartridge case where adding bullet weight to gain more BC ends up meaning MORE problems downrange instead of less. Putting 250grn bullets into 30-06 cases doesn't pay back in performance downrange, even 230's start getting pretty ugly. I'd venture 160's in .277" bore is still bringing improvement over 140's, but we'd be near the tipping point, and the work it takes to get there isn't very interesting, rather than using a more modern cartridge design which allows the longer, more aerodynamic bullets to better fit mag boxes, and which does not end up seating the base of bullets below the shoulder junction, and which offers a more consistent burning powder column ratio, AND of course a lot of folks will want factory ammo options, which really won't become available for 150-160 class 270win, since they won't work in old slow-twist rifles...

 

[Varminterror]

Although it is a paper-punching bullet, outside the scope of this discussion.

Lame attempted dismissal by a Luddite which doesn't know of what they speak...

A LOT of game gets killed every year by A-tips, and frankly, you're living in the wrong world - the A-tips aren't a "paper punching bullet". The game they were designed to play doesn't punch paper.

 

[Gun-Reck]

Lame attempted dismissal by a Luddite which doesn't know of what they speak...

A LOT of game gets killed every year by A-tips, and frankly, you're living in the wrong world - the A-tips aren't a "paper punching bullet". The game they were designed to play doesn't punch paper.

A lot of game gets killed by automobiles as well.

Hunting bullets - are.

Stay in the sandbox.