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Originally Posted by SuperCub
Originally Posted by joelkdouglas
All told I don’t have any rifles chambered with an Ackley chamber because it’s not worth the extra effort.

Some of the older/tapered cases (250Savage Improved, 257 Roberts Improved, 30-30AI) see a good increase, but the 243 has a modern case shape.

THIS!

You Nailed it SuperCub. That's about the best explanation I've heard. I have one AI and that's a .257 Roberts. I went with the .257 because for years I always heard the .257 showed good gains. However, one thing puzzles me. The .30-06 case is old fashion also, but the AIs I've read about it were minimul of any gain which leads me to believe there are other factors involved. Maybe amount of overbore has something to do with it.

My .257 shows gains with 115 grain bullets of up to 200-300 FPS over the standard .257 Roberts depending on propellant used. I've had the best gains with the 115 grain bullets using RL-17. However YMMV.

Last edited by Filaman; 07/01/20.

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I have to add that my .257 AI has a 26" barrel which helps maximize gains.


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How many of you, have shot out the barrel of a .243 A.I. 1x8 twist with 105 to 108 gr, bullets ?? Rio7

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[quote=Filaman]


You Nailed it SuperCub. That's about the best explanation I've heard. I have one AI and that's a .257 Roberts. I went with the .257 because for years I always heard the .257 showed good gains. However, one thing puzzles me. The .30-06 case is old fashion also, but the AIs I've read about it were minimul of any gain which leads me to believe there are other factors involved. Maybe amount of overbore has something to do with it.

Re: 30-06 Imp.: 'Tis a confused mess of opinion, preconceived bias, or hearsay, mixed with maybe overly judicious handloading & a low SAAMI pressure for the old 06. Most of my data is from the early '90s with IMR4350, WW brass, & WLRs, but have safely reached 3300fps with 150s, 3200fps with 165s, & a tad over 3000fps with 180s with reasonably good accuracy (all either Nosler Solid Base or Ballistic Tip) in my 30-06 Ackley. It has a 26" barrel. Fully formed cases hold c.10% more water than standard 06. Temps were mostly around 75*, but there were some 30* days in there as well. That's knockin' on, but not quite, 300 H&H velocities. I also started development with RL19 & 150s with slightly better accuracy stopping about 100fps less (max pressure) than the 4350 loads. RL19 peaked out before 4350 with 165s & 180s even sooner. Never did get around to trying RL22 back then. The brass all lasted for 5 or more reloads & some is still loaded in MTM boxes ready to go if the necks dont split after 30 years. Will probably seat the bullets a few thou deeper to break the weld if there is one.

Using Sierra VI data, I recently tried some RL17 matching their speeds rather closely in some of these same old cases. I am curious what pressure Sierra held their loads to as they stop at 2900fps for the 180s in the Ackley, but also show 2900 as max velocity for the standard 06 while showing only a small gain for 150s & 165s with the Ackley. I may continue ever so slowly upward with these but will likely just stick with what is already known to work.


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Originally Posted by RIO7

How many of you, have shot out the barrel of a .243 A.I. 1x8 twist with 105 to 108 gr, bullets ?? Rio7



I’m rebarreling my rock 1-8” twist 243 after approx 1500 rounds. Vast majority of the mileage was firing 105 bthp using RL17.

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Originally Posted by 358WCF
[quote=Filaman]


You Nailed it SuperCub. That's about the best explanation I've heard. I have one AI and that's a .257 Roberts. I went with the .257 because for years I always heard the .257 showed good gains. However, one thing puzzles me. The .30-06 case is old fashion also, but the AIs I've read about it were minimul of any gain which leads me to believe there are other factors involved. Maybe amount of overbore has something to do with it.

Re: 30-06 Imp.: 'Tis a confused mess of opinion, preconceived bias, or hearsay, mixed with maybe overly judicious handloading & a low SAAMI pressure for the old 06. Most of my data is from the early '90s with IMR4350, WW brass, & WLRs, but have safely reached 3300fps with 150s, 3200fps with 165s, & a tad over 3000fps with 180s with reasonably good accuracy (all either Nosler Solid Base or Ballistic Tip) in my 30-06 Ackley. It has a 26" barrel. Fully formed cases hold c.10% more water than standard 06. Temps were mostly around 75*, but there were some 30* days in there as well. That's knockin' on, but not quite, 300 H&H velocities. I also started development with RL19 & 150s with slightly better accuracy stopping about 100fps less (max pressure) than the 4350 loads. RL19 peaked out before 4350 with 165s & 180s even sooner. Never did get around to trying RL22 back then. The brass all lasted for 5 or more reloads & some is still loaded in MTM boxes ready to go if the necks dont split after 30 years. Will probably seat the bullets a few thou deeper to break the weld if there is one.

Using Sierra VI data, I recently tried some RL17 matching their speeds rather closely in some of these same old cases. I am curious what pressure Sierra held their loads to as they stop at 2900fps for the 180s in the Ackley, but also show 2900 as max velocity for the standard 06 while showing only a small gain for 150s & 165s with the Ackley. I may continue ever so slowly upward with these but will likely just stick with what is already known to work.

That's the best by far I've ever heard about the 06 AI. With performance like that, who needs a magnum?


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woodson, Must be a lousy barrel I have 3 .243A.I. with over 4000 rnds down the tube on each one, and all will shoot dime sized group at 100 yrds, hope you get a better barrel this time. Rio7

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Originally Posted by RIO7
woodson, Must be a lousy barrel I have 3 .243A.I. with over 4000 rnds down the tube on each one, and all will shoot dime sized group at 100 yrds, hope you get a better barrel this time. Rio7


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Originally Posted by RIO7
woodson, Must be a lousy barrel I have 3 .243A.I. with over 4000 rnds down the tube on each one, and all will shoot dime sized group at 100 yrds, hope you get a better barrel this time. Rio7

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Originally Posted by RIO7
woodson, Must be a lousy barrel I have 3 .243A.I. with over 4000 rnds down the tube on each one, and all will shoot dime sized group at 100 yrds, hope you get a better barrel this time. Rio7


Ordered another Rock barrel. I don’t feel as though 1500 rounds is unreasonable out of a 243. Grats if you’re getting 4K+ out of your AIs.

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I've got 2,300 rds on a 6 Dasher that is giving up the ghost.

H1000 Rio?

Whose bbl's?


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AA2700 has one of the coolest heat index's of all powders. We shot the AI on p. dog towns, hot and heavy. About .070 freebore growth in 1700 rounds was normal, but cut off 3/4-1.5" and you are into new barrel...not so with many other powders.

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I bought one of the cheap digital borescopes off amazon, thing works amazingly well. Good investment if anyone thought that a useful borescope wasn’t out of their price point.

Last edited by woodson; 07/04/20.
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Higginez, my barrels are 2 Wilson 1 Proof research, Bullets 105 Scenar OR 107 SMK, Powder Retumbo, many people are suprised I use Retumbo, but I get 3050 FPS out of 22" barrel and dime size groups. RIO7

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before you build a 243 AI

take a look at the 6XC.........

same performance but much less powder........

dies & brass are easy too


https://www.accurateshooter.com/cartridge-guides/6xc/


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tikkanut, There are more 6mm chambers than you can shake a stick at and some are very good shooters, but I will stick with the .243 based round, easy to fire form, very accurate you can find ammo almost anywhere if for some reason you run out of reloads, the 6 creed, ain't bad at all, again if you can find ammo anywhere, how much powder a round burns means nothing to me if i couldn't afford to shoot the guns i do and reload for I would take up knitting' Rio7

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Rio7,

.243 speeds with slow powders is not really same/same and certainly not an indication of what great barrels you have.

Have a great 4th of July


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Originally Posted by Higginez
Rio7,

.243 speeds with slow powders is not really same/same and certainly not an indication of what great barrels you have.

Have a great 4th of July


One could say that in itself is a success. I have shot out more 243 barrels than all others combined at 243 velocities.


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Last thing I would want in a p/dog patch would be a 243...let alone an 243 AI

Even a heavy barrel....noise/recoil/heat.....

Many better 6mm choices as even you mentioned

6BR non repeater....30-31 grs....my ole fav the 6XC...37-38 grs

Oh....I don't buy store bought ammo so I don't worry about running out


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I have two .243 AI Rem 700 SA rifles, one sporter contour and one Varmint contour. These are factory barrels re-chambered to AI before the 6XC or the 6 Creedmoor existed. I also have a 6mm AI re-chambered factory 6 mm sporter contour barrel on a Rem 700 long action and a 6 Creedmoor Lilja barrel on a Rem 700 SA. I did the AI conversions to eliminate trimming and change the tendency of the .243 to erode throats. Been happy with the .243 AI chambers, but I really like my 6mm AI compared to the .243 AI's , but today, I would do either the 6 Creedmoor or 6XC. My 6mm AI is incredibly accurate and regularly shoots to 800 to 1000 yards on gongs and prairie dogs. My 6 Creedmoor does similarly. Personally, I think there are currently better options than the .243 or .243 AI.

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