Tikka T3X in 6 ARC
#1
Hi everyone,

I’m new to this forum and just wanted to share some info; I’ve been handed so much good info over the years on forums that it’s only right to contribute when I can. So here goes, in case this wasn’t known prior (and I’m not the first to do this by any means). 

I took a Tikka T3X chambered in 223 Remington. Removed the barrel, stripped the bolt. Sent bolt of to Kinport Peak Rifles to have the bolt face reamed to accept the 6ARC case head. Ordered a barrel from PBB. 
Just assembled the rifle a couple weeks ago. Tested the Tikka S, M & M+ magazines, had heard from all my research that the M was the most reliable but in a couple hundred feedings I couldn’t get any of them to cause issue. 

Ejection with SWFA 3-9x42 and Athlon Midas TAC 4-16x44 were non-issues, both in medium rings. No dings in case mouths, no marks on windage turrets. Did run into a snag when testing for CBTO (I use the Wheeler method), but that isn’t the fault of the barrel maker. Personally I disagree with that dimension from Hornady engineers, subsequent testing will determine if I’m right or wrong as the barrel has now been pulled off & sent to be throated. I’ll update that when I get it back & test it. 

Took it to the range prior to sending barrel off to be throated, because who can resist when they get a new gun? Everything functioned flawlessly, but it was a short trip just to get it out of my system; before throating load dev was a waste of time. 

Anyway there you have it; the Tikka T3X is a viable option, runs flawlessly…and I’ll report back regarding chamber dimensions in-depth along with accuracy results. If done right it isn’t expensive. Buy the gun, then the barrel can be covered by the sale of the 223 barrel in certain circles, bolt face is about $100-150…so not much more than the original cost of the rifle in the end.
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#2
(08-30-2024, 01:58 PM)Hurley88 Wrote: Hi everyone,

I’m new to this forum and just wanted to share some info; I’ve been handed so much good info over the years on forums that it’s only right to contribute when I can. So here goes, in case this wasn’t known prior (and I’m not the first to do this by any means). 

I took a Tikka T3X chambered in 223 Remington. Removed the barrel, stripped the bolt. Sent bolt of to Kinport Peak Rifles to have the bolt face reamed to accept the 6ARC case head. Ordered a barrel from PBB. 
Just assembled the rifle a couple weeks ago. Tested the Tikka S, M & M+ magazines, had heard from all my research that the M was the most reliable but in a couple hundred feedings I couldn’t get any of them to cause issue. 

Ejection with SWFA 3-9x42 and Athlon Midas TAC 4-16x44 were non-issues, both in medium rings. No dings in case mouths, no marks on windage turrets. Did run into a snag when testing for CBTO (I use the Wheeler method), but that isn’t the fault of the barrel maker. Personally I disagree with that dimension from Hornady engineers, subsequent testing will determine if I’m right or wrong as the barrel has now been pulled off & sent to be throated. I’ll update that when I get it back & test it. 

Took it to the range prior to sending barrel off to be throated, because who can resist when they get a new gun? Everything functioned flawlessly, but it was a short trip just to get it out of my system; before throating load dev was a waste of time. 

Anyway there you have it; the Tikka T3X is a viable option, runs flawlessly…and I’ll report back regarding chamber dimensions in-depth along with accuracy results. If done right it isn’t expensive. Buy the gun, then the barrel can be covered by the sale of the 223 barrel in certain circles, bolt face is about $100-150…so not much more than the original cost of the rifle in the end.
Sounds like you have setteled this one. Now to convince Tikka. Looking forward to Tikka offering the 6mm Arc as a factory chambering. Get her Done Tikka!
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#3
I’m very interested in this .
Do you have a picture of the Bolt Head alteration ?
Also very happy to hear about the Magazine compatibility, because reliable feeding and operation is a “ must have “ for my Rifles.
Any photos of the bolt / loaded magazines etc would be greatly appreciated.

Ken
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#4
Just jotted down a note to send pics once I get back home this weekend. Out of town right now. But he basically reams out the bolt face to 0.445” IIRC.

As an update, still haven’t had any issue with any of the magazines. But it turns out that the barrel was chambered with a worn reamer & the manufacturer is refunding me. Throat was horrible, accuracy was unacceptable. Should’ve got the bore scope out as soon as I measured bullet jump, would’ve saved a couple hundred rounds of ammo. But, a busy life makes for half-brained progress. Sometimes you gotta circle back.

Will update once the new barrel arrives.
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