I read an article about it, but can't find any info on it. Anyone seen or shot a 270 Ackley Improved?
.270 AI
- Thread starter OldmaninNeb
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Re: .270 AI
I have only heard of 270 win, 270WSM, and 270 weatherby must be fairly new I was just looking into getting a 270 wsm and did some research and never saw anything on it. Where did you see this article wouldn't mind reading it myself?
I have only heard of 270 win, 270WSM, and 270 weatherby must be fairly new I was just looking into getting a 270 wsm and did some research and never saw anything on it. Where did you see this article wouldn't mind reading it myself?
Re: .270 AI
I belive that there is a 270WSM AI....but my memory is horrible and I thought I saw it in Midway's Reamer listing.
The 270WSM is a great cartridge...gained about 200FPS across the board on the 270Win....kicks about like a 7mmRM.
PMM me if you want any more info on the 270WSM.
I belive that there is a 270WSM AI....but my memory is horrible and I thought I saw it in Midway's Reamer listing.
The 270WSM is a great cartridge...gained about 200FPS across the board on the 270Win....kicks about like a 7mmRM.
PMM me if you want any more info on the 270WSM.
Re: .270 AI
Here's what ol' Ackley himself had to say about it on p.382 of his book "Handbook for Shooters & Reloaders Vol.1" -
.270 Winchester Improved (Ackley)
"This is a fire formed .270 made by firing factory cartridges in the improved chamber.Since the original .270 is over bore capacity, little improvement can be expected although some shooters say it is a fair cartridge for bullets heavier than 150 gr. Due to its relative inefficiency, it is not recommended. The standard .270 in unaltered form should be better, therefore no loading data is given."
To understand what Ackley was talking about when he mentioned "over bore capacity" you should read his chapter on the subject starting on p.165 of the same book that I already mentioned. It's too long for me to include in this post verbatim.
Here's what ol' Ackley himself had to say about it on p.382 of his book "Handbook for Shooters & Reloaders Vol.1" -
.270 Winchester Improved (Ackley)
"This is a fire formed .270 made by firing factory cartridges in the improved chamber.Since the original .270 is over bore capacity, little improvement can be expected although some shooters say it is a fair cartridge for bullets heavier than 150 gr. Due to its relative inefficiency, it is not recommended. The standard .270 in unaltered form should be better, therefore no loading data is given."
To understand what Ackley was talking about when he mentioned "over bore capacity" you should read his chapter on the subject starting on p.165 of the same book that I already mentioned. It's too long for me to include in this post verbatim.
Re: .270 AI
Thanks for the heads up. I can't find the magazine the article was in, but did remember the other shooters were impressed that it could go thru windshields and branches and still hit the target.
Thanks for the heads up. I can't find the magazine the article was in, but did remember the other shooters were impressed that it could go thru windshields and branches and still hit the target.
Re: .270 AI
The 270 Win can be pushed to 270 WSM speeds in modern bolt action rifles. I think the 270 has a unique combination of overbore to allow this. You can not push the same weight bullet in other necked down '06 calibers as fast as the 270. Making the 270 an AI case would give you more case capacity. But, I think you would need a longer barrel to really take advantage of the extra powder.
The 270 Win can be pushed to 270 WSM speeds in modern bolt action rifles. I think the 270 has a unique combination of overbore to allow this. You can not push the same weight bullet in other necked down '06 calibers as fast as the 270. Making the 270 an AI case would give you more case capacity. But, I think you would need a longer barrel to really take advantage of the extra powder.
Re: .270 AI
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SpotcheckBilly</div><div class="ubbcode-body">Here's what ol' Ackley himself had to say about it on p.382 of his book "Handbook for Shooters & Reloaders Vol.1" -
.270 Winchester Improved (Ackley)
"This is a fire formed .270 made by firing factory cartridges in the improved chamber.Since the original .270 is over bore capacity, little improvement can be expected although some shooters say it is a fair cartridge for bullets heavier than 150 gr. Due to its relative inefficiency, it is not recommended. The standard .270 in unaltered form should be better, therefore no loading data is given."
To understand what Ackley was talking about when he mentioned "over bore capacity" you should read his chapter on the subject starting on p.165 of the same book that I already mentioned. It's too long for me to include in this post verbatim. </div></div>
Ackley had a great idea and this was a continuation of this. One of the problems is he created rounds that are actually much better suited with newer powders that take advantage of burn retardants and doublebased kernel type powders instead of ball. (Yes sir...he was ahead of his time) When he wrote that the only double based powder you could get was ball type. Which didn't fill the case near as much as kernel type. Thereby, at the time, proving what he wrote about not only the .270 (Win) AI, but the .280 (Rem) AI and the 30-06 AI. The last I don't understand because everybody and their brothers uncle was talking about how much an improvement the .300 Win mag was over the 30-06. Meaning the 30-06 was written off as overbore, but the .300 WM, .300 WBY, and the .300 H&H weren't?
Bottom line is: with newer powders, especially Re-17, it's a very viable round and will give about 100-150 FPS velocity advantage over the standard .270. It will come close to but not exceed the .270 WSM.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SpotcheckBilly</div><div class="ubbcode-body">Here's what ol' Ackley himself had to say about it on p.382 of his book "Handbook for Shooters & Reloaders Vol.1" -
.270 Winchester Improved (Ackley)
"This is a fire formed .270 made by firing factory cartridges in the improved chamber.Since the original .270 is over bore capacity, little improvement can be expected although some shooters say it is a fair cartridge for bullets heavier than 150 gr. Due to its relative inefficiency, it is not recommended. The standard .270 in unaltered form should be better, therefore no loading data is given."
To understand what Ackley was talking about when he mentioned "over bore capacity" you should read his chapter on the subject starting on p.165 of the same book that I already mentioned. It's too long for me to include in this post verbatim. </div></div>
Ackley had a great idea and this was a continuation of this. One of the problems is he created rounds that are actually much better suited with newer powders that take advantage of burn retardants and doublebased kernel type powders instead of ball. (Yes sir...he was ahead of his time) When he wrote that the only double based powder you could get was ball type. Which didn't fill the case near as much as kernel type. Thereby, at the time, proving what he wrote about not only the .270 (Win) AI, but the .280 (Rem) AI and the 30-06 AI. The last I don't understand because everybody and their brothers uncle was talking about how much an improvement the .300 Win mag was over the 30-06. Meaning the 30-06 was written off as overbore, but the .300 WM, .300 WBY, and the .300 H&H weren't?
Bottom line is: with newer powders, especially Re-17, it's a very viable round and will give about 100-150 FPS velocity advantage over the standard .270. It will come close to but not exceed the .270 WSM.
Re: .270 AI
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">but did remember the other shooters were impressed that it could go thru windshields and branches and still hit the target.</div></div>
Any rifle bullet will be deflectded by windshields and branches.
I think speeding up the 270s 130 or 150 grin bullet would cause it to deflect more, or at least it did on 223s and 308 bullets when we were playing around with windshields and such in some of the sniper schools I ran.
I havent tried it on the 270, I may be wrong.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">but did remember the other shooters were impressed that it could go thru windshields and branches and still hit the target.</div></div>
Any rifle bullet will be deflectded by windshields and branches.
I think speeding up the 270s 130 or 150 grin bullet would cause it to deflect more, or at least it did on 223s and 308 bullets when we were playing around with windshields and such in some of the sniper schools I ran.
I havent tried it on the 270, I may be wrong.
Re: .270 AI
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kraigWY</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">but did remember the other shooters were impressed that it could go thru windshields and branches and still hit the target.</div></div>
<span style="color: #FF0000"><span style="font-weight: bold">Any rifle bullet will be deflectded by windshields and branches.</span></span>
I think speeding up the 270s 130 or 150 grin bullet would cause it to deflect more, or at least it did on 223s and 308 bullets when we were playing around with windshields and such in some of the sniper schools I ran.
I havent tried it on the 270, I may be wrong.
</div></div>
Nuhuaa!!!!!
Was there an average ratio of deflection for typical modern saftey glass or was it all over the board? Naturally curious.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kraigWY</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">but did remember the other shooters were impressed that it could go thru windshields and branches and still hit the target.</div></div>
<span style="color: #FF0000"><span style="font-weight: bold">Any rifle bullet will be deflectded by windshields and branches.</span></span>
I think speeding up the 270s 130 or 150 grin bullet would cause it to deflect more, or at least it did on 223s and 308 bullets when we were playing around with windshields and such in some of the sniper schools I ran.
I havent tried it on the 270, I may be wrong.
</div></div>
Nuhuaa!!!!!
Was there an average ratio of deflection for typical modern saftey glass or was it all over the board? Naturally curious.
