280 AI Tikka T3

Hi there,

I'm planning on getting a custom rifle built and rechambering my t3 in 280AI with a carbon barrel and carbon stock at the same time. Will still use the t3 action. I also have in the back of my mind 284 and 7mm saum.

Was just wondering if anyone has had any experience in this caliber with this action? Will the higher BC bullets that are longer be able to be seated out far enough to the lands but still fit in the mag? As at the moment with 7mm 08 I struggle and have had to go long action bolt stop and long action magazine to midigate this.

Any help or info would be greatly appreciated.
Cheers Bryan

http://i1357.photobucket.com/albums/...pske4pbacf.jpg

My 280AI on Tikka T3 action.

Mag feed 162 AMAX jump to lands but still shoot better than I can.

they all about the same ranging from 2800 fps upto just under 3000 fps just pick the one u like best the saum is on a magnum bolt face the other 2 standard cheers

I looked at doing this was going to do a 284win on my 7mm08 but decided to just get a 7rm and chop it back to 20"
Shoots the 162amax just under 3000 with silly small groups, there was a load going faster think kg said 3150 but that opened up to almost 1moa

I have a fluted bolt, carbon stug stock and dpt wears a vx6 2-12 in tellys
Its and is a dream to carry and shoot, the weight savings going from a t3 barrel to carbon is very little HRE told me there was around 80g in it and you can only run his suppressors

All comes down to what you want to spend at the end of the day, only reason i would rebarrel would to go faster twist and run the heavy 190grn+ bullets

Stick with the 7/08 mate - it's the only gun you need @Philipo - mine seems to do alright some of the time.

Haters gonna hate! ;)

All good replys. Thank you very much. 199P was there any other reason to go carbon fibre barrel? Like accuracy or anything? or not worth it until you go bench rest shooting?
The only reason I am re barreling is my barrel has been cut down and want to get that longer again.

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Originally Posted by George22

All good replys. Thank you very much. 199P was there any other reason to go carbon fibre barrel? Like accuracy or anything? or not worth it until you go bench rest shooting?
The only reason I am re barreling is my barrel has been cut down and want to get that longer again.

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They claim it wont effect point of impact changes as the barrel heats up, but that's been disproven and proven so probably comes down to barrel difference itself.
Also its not a big deal for hunting as very rarely will you shoot a large group of shots.

What length barrel is the 7/08 now?

I've recently rechambered at t3 708 to 284 win. Fit a long action mag and bolt stop and you have plenty of mag room.

My barrel is only 17" long and I'm now running the 162g Amax at 2800 fps. A 22" barrel would do 2900 easy just with 2209.

Love the 284 case.

284 Win case with the 162g Amax seated out to the optimal position, this also gives max powder capacity (which gives 3.190" total ammo length)

Attachment 62693

This is the 284 Win with Amax seated at that length in a T3 Long action mag, perfect.

Attachment 62694

Im picking if you used a 280 AI case, being longer you would have to seat the Amax deeper, therefore reducing your powder capacity. The 284 Win comes alive when you run it on a long action like this.

Attachment 62695

@GWH what does that weigh all up?


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Originally Posted by sambnz

@GWH what does that weigh all up?


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It's by no means a super lightweight.

I have a photo of it sitting on the scales, think it was just over 3.5kg. Scope alone is 500 gr from memory. It's also a magnum suppressor (can get away with the smaller/lighter non magnum one)

I'll dig the photo out when back home.

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Originally Posted by sambnz

@GWH what does that weigh all up?


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Here you go

Attachment 62700

And looks like custom rifle still using Tikka Rings. LOL cant be as bad as we led to believe eh ? :D

you wont go wrong with any of the 3 options - all are a significant step up in fps over 7mm08 (which is still a damn fine choice for most NZ hunting situations). I own all the above - 280AI is a sentimental fav & gets me to 800 yds, the down side is long action and you'll need a 24 in (or longer barrel) to ring the best velocity out of it. More of an open tops rifle than bush bashing & in light weight rifle its kicks pretty hard. The 284 seems to be an underrated calibre in NZ (no factory ammo), but those who own them or shot with them know how good they are & you can run short barrel & light weight rifle with really good performance. Recoil with a suppressor is super light ... like non existent. In my experience 284 speeds are slightly under the 280AI, but based on 20 in barrel with bare rifle weighing in at 5.6 lbs its damn nice rifle to carry on the hill, especially bush stalking (built on Weatherby MK5 ultralight). SAUM short action REM model 7, 22 in bbl in STUG stock weighs in just a sniff under 6lbs bare rifle, and 162 AMAX doing 2930fps 0.5 moa groups. Pretty hard to beat. You're spoilt for choice ! Only down side on Tikka's is fighting the mag length, but if you go 284 on long action that should not be an issue.

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Originally Posted by Happy

And looks like custom rifle still using Tikka Rings. LOL cant be as bad as we led to believe eh ? :D

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Yeah I've put the S/S screws in them and giving them a try, after hearing of others doing it and saying they were fine.

I have two T3's now and have these standard tikka rings on both.

Jury is still out, I'll see how they go and if no good will likely replace with talleys.

Hard case seeing you calling it a custom rifle, I don't think of it as that, but I guess it probably is. Just a t3 that's had a couple of things done, but nothing fancy at all.

I believe that 284 is mean't to be less of a barrel burner, which for a hunting rifle may not be a problem, but if you shoot targets or steel will start to become more of an issue.

I'd go for what ever was going to give me the least issues regarding brass prep.
284 can be necked up from 6.5-284 Lapua brass which is readily available, and you should be able to get a chamber cut for this so that requires no neck turning.
280 brass seems to be available from Norma and Hornday but will need firefroming for 280ai (obviously) which I personally couldn't be bothered doing.

I know neck turning and fire forming is a once off operation, but to me brass prep is boring and a pain in the ass.

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Originally Posted by Beetroot

I believe that 284 is mean't to be less of a barrel burner, which for a hunting rifle may not be a problem, but if you shoot targets or steel will start to become more of an issue.

I'd go for what ever was going to give me the least issues regarding brass prep.
284 can be necked up from 6.5-284 Lapua brass which is readily available, and you should be able to get a chamber cut for this so that requires no neck turning.
280 brass seems to be available from Norma and Hornday but will need firefroming for 280ai (obviously) which I personally couldn't be bothered doing.

I know neck turning and fire forming is a once off operation, but to me brass prep is boring and a pain in the ass.

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My mate has a 280AI and uses Nosler 280AI brass, so no need to fireform if you want to fork out the pingas for that.

In my recent experience, not matter what reamer spec you use for 284 Win, if you are necking 6.5x284 brass up, you really should have them turned (see my recent thread in the Reloading section) It is a one off operation, and its not that hard if you have the gear.

Camo WSM current barrel length is 18 inches. Man some bloody good info on here! I think I might go with the 284 purely for seating bullets out longer. do the 284s benefit from a longer barrel at all? or do they like the short ones? Fps for 284 140 gr and 280 ai 140 gr? anyone got that info?

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Originally Posted by George22

Camo WSM current barrel length is 18 inches. Man some bloody good info on here! I think I might go with the 284 purely for seating bullets out longer. do the 284s benefit from a longer barrel at all? or do they like the short ones? Fps for 284 140 gr and 280 ai 140 gr? anyone got that info?

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Run the 162 amax / eldx bro they kill so well and hit very hard.

With longer barrel you get more speed but short barrels are much better 90% of the time

Quote:

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Originally Posted by George22

Camo WSM current barrel length is 18 inches. Man some bloody good info on here! I think I might go with the 284 purely for seating bullets out longer. do the 284s benefit from a longer barrel at all? or do they like the short ones? Fps for 284 140 gr and 280 ai 140 gr? anyone got that info?

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Sounds like your rifle could be perfect for a short .284 conversion as is mate just get it reamed to .284

Yea could be but Im coming across some money soon and figured I'd spend some money. Probably wont go carbon barrel anymore after some info kindly passed on on here. so only looking at a match grade barrel instead.

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Originally Posted by Beetroot

I believe that 284 is mean't to be less of a barrel burner, which for a hunting rifle may not be a problem, but if you shoot targets or steel will start to become more of an issue.

I'd go for what ever was going to give me the least issues regarding brass prep.
284 can be necked up from 6.5-284 Lapua brass which is readily available, and you should be able to get a chamber cut for this so that requires no neck turning.
280 brass seems to be available from Norma and Hornday but will need firefroming for 280ai (obviously) which I personally couldn't be bothered doing.

I know neck turning and fire forming is a once off operation, but to me brass prep is boring and a pain in the ass.

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280AI brass is available from both Nosler & Norma, no fireforming, GTG :)

Necking up 6.5-284 will result in donuts, not an issue if the projectiles are throated long, otherwise its an issue.

as other have stated 280AI brass is available off the shelf but a tad pricey, and you can simply use 280 ammo in a 280AI no issues at all (unless you've got some crazy neck tolerances). So you can use factory 280 ammo for your bush loads & get fired formed brass "for free". I think your biggest decision is long action vs short/medium action. What ever you build you'll have to hand load to get long range performance.

Hmmm never knew 280ai factory brass existed, would certainly be a big plus for me.

I used 280ai brass and it's good but owning both calibres id go back to 284 in a heartbeat. Easy to load, cheap to run, efficient as and cool.
I had a ultralight Mk5 long action think at 22". It threw the 140 around fast as.


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Originally Posted by Beetroot

Hmmm never knew 280ai factory brass existed, would certainly be a big plus for me.

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I have both Nosler & Norma 280 AI brass available.

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Originally Posted by Danny

I used 280ai brass and it's good but owning both calibres id go back to 284 in a heartbeat. Easy to load, cheap to run, efficient as and cool.
I had a ultralight Mk5 long action think at 22". It threw the 140 around fast as.


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Yeah u sold it to me :thumbsup:. 20 in bbl, I then changed the stock over to a STUG & shaved off another 1/2lb and the groups shrunk..... "never sell a good rifle".

Another vote for .284 from me.
No problem with mag length and ballistics the same as .280.
I'm going with a 20" barrel, DPT, 162 ELD-X and 2213sc.
Will have it throated long as Greg says and will neck turn to just into the shoulder to limit donuts.
As far as I can see Gunworks are the only ones that will ream T3 barrels (anybody know of others?).

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Originally Posted by Simmo

Another vote for .284 from me.
No problem with mag length and ballistics the same as .280.
I'm going with a 20" barrel, DPT, 162 ELD-X and 2213sc.
Will have it throated long as Greg says and will neck turn to just into the shoulder to limit donuts.
As far as I can see Gunworks are the only ones that will ream T3 barrels (anybody know of others?).

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Yep the 284 with 162g bullets seated out long to the optimal place is perfectly suited to T3 LA mag. Custom Throated to suit obviously.

I'm really happy with how mines worked out. Gunworks rechambered it.

I've settled on the 162g Amax at 2750fps for great accuracy.

Holds 1000 ft-lb to 850 yards. Pretty good from a 17" barrel and 52.5gr of powder.

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2 shots at 300

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