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Q:
I am considering building a 243 Ackley Improved for my coyote rifle and also to hunt deer and antelope with. I do have other rifles that I can hunt big game with but I want to get back to shooting one main rifle, and shoot it a lot. Im wondering if any of you have had experience with this cartridge or any of the other AI's. Answers on feeding would be particularly helpful as I have heard that they have feeding problems. Also, was it worth it to you. Thanks guys

Question by Ol Krusty. Uploaded on October 30, 2011

Answers (13)

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from twoforks wrote 2 years 24 weeks ago

I did it to my 270 and I didn't like it. You have to have the barrel chambered. You can't buy brass or ammo for it. If you reload you have to buy dies that cost about $100.00 and you have to form fire the cases. Also how does it compare to the regular 243 in fps?

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from scratchgolf72 wrote 2 years 24 weeks ago

dad had a 22-250 ackley improved built for him awhile back...shoots close to 4000 fps with hot loads. he had a hell of a time working up an accurate hand load for it but once he did it was a shooter.

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from Ol Krusty wrote 2 years 24 weeks ago

Twoforks
From the info that I have found the velocity increase is about 100 to 200 fps more. I would handload for it, but as far as dies go couldn't I just use a 243 neck sizer die after I fire form the brass? I should mention that the action I have is a short, and the mag will only allow a COAL of 2.8".

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from Sarge01 wrote 2 years 24 weeks ago

From the data I can find you only gain 200FPS and that is what the 6MM has over the .243 so why not build a 6MM. Brass is readily available as is dies so no special equipment is needed. The 6MM has always been a favorite of mine.

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from DakotaMan wrote 2 years 24 weeks ago

I have always liked AIs. However, the .243 AI is one of the least effective improvements of this type because it is so close to the parent case dimensions. It only holds a little more powder. You will get more velocity but it is nominal. Generally, not considered to be worth all the extra cost, effort and hassel unless you are really bent on that specific project.

I shot a 25-06 AI for many years and liked the speed. However, the increase in speed is barely worth it. The straighter case is not as forgiving as a tapered case but I never had any trouble with mine. Ol Krusty, new dies are required for the AI because of the sharper shoulder and wider shoulder diameter.

If you want a hot coyote and antelope rifle I suggest a 25-06. Using a 26" barrel, you can shoot a 100g bullet over 3500 fps and that takes deer and antelope right off their feet. 87g coyote loads going 3600 fps leave the .243 AI in the dust and it really shoots. If I were going to AI something, it would be a 25-06 in a 26" barrel. Take a look at the speed difference. I don't know why you notice it so much but nothing has made such a speed impression on me except for maybe the .220 Swift.

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from Ol Krusty wrote 2 years 24 weeks ago

Dakota Man
Honestly that is the cartridge that I would really like to have, but as I mentioned I have a short action so the 25-06 is out of the equation for now. I do suppose I could try a 257 Roberts or a AI version of it. Do you have any experience with the Roberts?
Sarge
I don't know why but I never thought about the 6mm. That's a great idea. Is there a AI version that is even better? Not sure why but I've always wanted to try a AI

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from Sarge01 wrote 2 years 24 weeks ago

I have never heard of a 6MM AI. I use to shoot 70 grain bullets out of my 6MM at fairly good speed. If I was going to invest in one it would probably be a .257 Roberts,same case as my 6MM.

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from 007 wrote 2 years 24 weeks ago

Friend of mine has done some impressive things with a 6mm that has had some finetuning and judicious handload development. I too have heard nothing positive about the .243 AI.

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from Treestand wrote 2 years 24 weeks ago

If its a matter of 200fps, try Hornadys Supper-P Ammo.
I used it in my Rem-M700/243 with a 20"Bbl when we ran a test, it was 227fps faster then Rem or Win-Ammo
and NO Re-loading needed!

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from WA Mtnhunter wrote 2 years 24 weeks ago

See link below:

http://www.6mmbr.com/gunweek042.html

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from Sarge01 wrote 2 years 23 weeks ago

WAM,
I didn't know that the 6MM had been made an AI. That would be a fine round.

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from Ol Krusty wrote 2 years 23 weeks ago

Thanks for everyone's responses.

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from merbeau wrote 2 years 19 weeks ago

Hi

Just saw your post. I am in the early stages of rebuidling my Browning Safari which was orginally in 243 caliber. After much reading and searching I have decided on the 6mm Super LR.

http://www.6mmar.com/Super_LR.html

This wildcat used the 243 case as its base and there are commercial dies available. It has the advantage of extended barrel life and excellent performance for both varmint and target shooting.

My shooting is confined to 600 yards or less and I used the Miller index to find the correct twist which for my application was 1:9 and allows from 70 to 105 grain bullets (including the 95 gr VLD).

If you want 1000 yd ability then probably a faster rate for target shooting. For strictly varmint perhaps a slower rate would be more suitable.

I have the Miller equation in Excel format and 125 bullet combinations in Word format with the results.

Robert

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from twoforks wrote 2 years 24 weeks ago

I did it to my 270 and I didn't like it. You have to have the barrel chambered. You can't buy brass or ammo for it. If you reload you have to buy dies that cost about $100.00 and you have to form fire the cases. Also how does it compare to the regular 243 in fps?

+2 Good Comment? | | Report
from Treestand wrote 2 years 24 weeks ago

If its a matter of 200fps, try Hornadys Supper-P Ammo.
I used it in my Rem-M700/243 with a 20"Bbl when we ran a test, it was 227fps faster then Rem or Win-Ammo
and NO Re-loading needed!

+2 Good Comment? | | Report
from scratchgolf72 wrote 2 years 24 weeks ago

dad had a 22-250 ackley improved built for him awhile back...shoots close to 4000 fps with hot loads. he had a hell of a time working up an accurate hand load for it but once he did it was a shooter.

+1 Good Comment? | | Report
from Sarge01 wrote 2 years 24 weeks ago

From the data I can find you only gain 200FPS and that is what the 6MM has over the .243 so why not build a 6MM. Brass is readily available as is dies so no special equipment is needed. The 6MM has always been a favorite of mine.

+1 Good Comment? | | Report
from DakotaMan wrote 2 years 24 weeks ago

I have always liked AIs. However, the .243 AI is one of the least effective improvements of this type because it is so close to the parent case dimensions. It only holds a little more powder. You will get more velocity but it is nominal. Generally, not considered to be worth all the extra cost, effort and hassel unless you are really bent on that specific project.

I shot a 25-06 AI for many years and liked the speed. However, the increase in speed is barely worth it. The straighter case is not as forgiving as a tapered case but I never had any trouble with mine. Ol Krusty, new dies are required for the AI because of the sharper shoulder and wider shoulder diameter.

If you want a hot coyote and antelope rifle I suggest a 25-06. Using a 26" barrel, you can shoot a 100g bullet over 3500 fps and that takes deer and antelope right off their feet. 87g coyote loads going 3600 fps leave the .243 AI in the dust and it really shoots. If I were going to AI something, it would be a 25-06 in a 26" barrel. Take a look at the speed difference. I don't know why you notice it so much but nothing has made such a speed impression on me except for maybe the .220 Swift.

+1 Good Comment? | | Report
from Sarge01 wrote 2 years 24 weeks ago

I have never heard of a 6MM AI. I use to shoot 70 grain bullets out of my 6MM at fairly good speed. If I was going to invest in one it would probably be a .257 Roberts,same case as my 6MM.

+1 Good Comment? | | Report
from 007 wrote 2 years 24 weeks ago

Friend of mine has done some impressive things with a 6mm that has had some finetuning and judicious handload development. I too have heard nothing positive about the .243 AI.

+1 Good Comment? | | Report
from WA Mtnhunter wrote 2 years 24 weeks ago

See link below:

http://www.6mmbr.com/gunweek042.html

+1 Good Comment? | | Report
from Sarge01 wrote 2 years 23 weeks ago

WAM,
I didn't know that the 6MM had been made an AI. That would be a fine round.

+1 Good Comment? | | Report
from merbeau wrote 2 years 19 weeks ago

Hi

Just saw your post. I am in the early stages of rebuidling my Browning Safari which was orginally in 243 caliber. After much reading and searching I have decided on the 6mm Super LR.

http://www.6mmar.com/Super_LR.html

This wildcat used the 243 case as its base and there are commercial dies available. It has the advantage of extended barrel life and excellent performance for both varmint and target shooting.

My shooting is confined to 600 yards or less and I used the Miller index to find the correct twist which for my application was 1:9 and allows from 70 to 105 grain bullets (including the 95 gr VLD).

If you want 1000 yd ability then probably a faster rate for target shooting. For strictly varmint perhaps a slower rate would be more suitable.

I have the Miller equation in Excel format and 125 bullet combinations in Word format with the results.

Robert

+1 Good Comment? | | Report
from Ol Krusty wrote 2 years 24 weeks ago

Twoforks
From the info that I have found the velocity increase is about 100 to 200 fps more. I would handload for it, but as far as dies go couldn't I just use a 243 neck sizer die after I fire form the brass? I should mention that the action I have is a short, and the mag will only allow a COAL of 2.8".

0 Good Comment? | | Report
from Ol Krusty wrote 2 years 24 weeks ago

Dakota Man
Honestly that is the cartridge that I would really like to have, but as I mentioned I have a short action so the 25-06 is out of the equation for now. I do suppose I could try a 257 Roberts or a AI version of it. Do you have any experience with the Roberts?
Sarge
I don't know why but I never thought about the 6mm. That's a great idea. Is there a AI version that is even better? Not sure why but I've always wanted to try a AI

0 Good Comment? | | Report
from Ol Krusty wrote 2 years 23 weeks ago

Thanks for everyone's responses.

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