Accuracy international out of pocket calibers

To my knowledge I cut the first barrels for AI's in the following calibers:

6 Dasher, 6 BR, 6BRA in that order. The Dasher (2016ish) in fact, was taken to a match where several members of Team AI NA were in attendance and told the owner "That won't work, it won't feed". The owner then proceeded to win the match. Within 6 months he was wearing a Team AI NA shirt and I got several requests for mag kits and one of the Team members ordered a barrel from me.

That same owner also ordered a 450 Bushmaster from me and used it to great effect in a straight-wall regs area of his home state to clobber a bunch of deer.

I've also done a 458 Win Mag AI barrel for a guy in Ohio and a a 338-300 PRC Ackley for the same guy because he didn't want to deal with the Lapua for some reason.
 
I had a 6PPC barrel from the 90s. It does sound unusual, but it was actually a standard factory offering. I doubt many were made.

Despite the "rarity", I turned it into a 6BR as it wasn't even the right twist for 6PPC anyway.
 
To my knowledge I cut the first barrels for AI's in the following calibers:

6 Dasher, 6 BR, 6BRA in that order. The Dasher (2016ish) in fact, was taken to a match where several members of Team AI NA were in attendance and told the owner "That won't work, it won't feed". The owner then proceeded to win the match. Within 6 months he was wearing a Team AI NA shirt and I got several requests for mag kits and one of the Team members ordered a barrel from me.

That same owner also ordered a 450 Bushmaster from me and used it to great effect in a straight-wall regs area of his home state to clobber a bunch of deer.

I've also done a 458 Win Mag AI barrel for a guy in Ohio and a a 338-300 PRC Ackley for the same guy because he didn't want to deal with the Lapua for some reason.

Wade Stuteville made a 6 dasher barrel for my AI back around 2014/2015, but I cheated and used it on my AIAE Mk3 as I knew I could easily get it to run and feed from the single stack AICS magazines used by the AE... I tested feeding with dasher dummy rounds feeding into a 6.5cm barrel as proof of concept before I gave him the go ahead on the barrel. Pretty sure someone else had tried BR or dasher in an AI before I did because I remember asking about trying BR or dasher before I had the barrel done and was warned primer cratering might be an issue. The issue was AIs at that time had large firing pins which didn't play nice with small rifle primers, luckily Wade was one of the only ones offering bolt bushing and turning down firing pins for AIs at that time.

This was also before anyone was offering BR/dasher spacers and followers for the double stack AW mags. (Josh, I did use your AICS mag spacers in my 6 dasher AE and they worked great.)

As far as weird calibers in an AI, for a couple years I had one of Gilbert and Enriques 223 conversions in my AX...not very common. I think they also did a one off 6 Valkyrie conversion for Frank.

AI themselves offered some oddball cartridges in the very rare AW Varminter in the late 90s... they offered 223, 22br, 22-250, 22 middlested, 243, 6br, and possibly 22ppc and 6ppc, so I suppose AI themselves were likely the first to offer AI barrels in the BR family-- although in very, very limited quantities.
 
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Wade Stuteville made a 6 dasher barrel for my AI back in 2015, but I cheated and used it on my AIAE as I knew I could easily get it to run and feed from the single stack AICS magazines used by the AE... I tested feeding with dasher dummy rounds feeding into a 6.5cm barrel as proof of concept before I gave him the go ahead on the barrel. Pretty sure someone else had tried BR or dasher in an AI before I did because I remember asking about trying BR or dasher around 2014 and was warned primer cratering might be an issue. The issue was most AIs at that time had large firing pins which didn't play nice with small rifle primers, luckily Wade was one of the only ones offering bolt bushing and turning down firing pins for AIs at that time.

This was before anyone was offering BR/dasher spacers and followers for the double stack AW mags. (Josh, I did use your AICS mag spacers in my 6 dasher AE and they worked great.)

As far as weird calibers in an AI, for a couple years I had one of Gilbert and Enriques 223 conversions in my AX...not very common. I think they also did a one off 6 Valkyrie conversion for Frank.

AI themselves offered some oddball cartridges in the very rare AW Varminter in the late 90s... they offered 223, 22br, 22-250, 22 middlested, 243, 6br, and possibly 22ppc and 6ppc, so I suppose AI themselves were likely the first to offer AI barrels in the BR family-- although in very, very limited quantities.
You are right. AI did offer a lot of the BR calibres in the 90s, but mainly with the Coopermatch Series target rifles. The Varminters do not really count.

Digressing off topic here, apologies.

AI had been advertising 223 AWs (unrelated to the Varminter) in printed material as if they were immediately available off the shelf from around 1997 to maybe 2001. A catalogue I have calls it the Varmintmaster, rather than Varminter, in line with Palmamaster, Swissmaster, CISMmaster, and the Perrymaster, all from the Coopermatch Series. Later AI catalogues refer to these as the Master Series of rifles, including the Varmintmaster.
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I also have a Gunsite advert which mentions 223 AWs.
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A 1996 review of the Coopermatch Series target rifle mentions the offered calibres range from 22PPC up to 338LM, but these being single shot target/palma/300m/benchrest rifles, I guess they do not count - no different to taking a brand new action off the shelf and getting your favourite gunsmith to fit whatever calibre.
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I vaguely recall 6mm and 6.5mm Super LR being tried out on an AI.

I was interested in these wildcats at one point, but later felt they really didn't bring much to the table...