Best long-distance 7mm or 30 cal rebarrel for Tikka T3x with .473" boltface?

[BringBackThe80s]

Your not comparing

You Will only be able to seat the bullet until it touches the lands that doesn’t mean the 284 coal will be 3.34 which I have my doubts it will be any where near that.

I definitely don't think the .284 would get close to 3.34", even with something like a 190 A-Tip. I estimate it would be ~3.19".

 

[BringBackThe80s]

First off I never seen a barrel length, or did I miss that ? Short barrel 22” and below I’d say 284. 22” and above I’d say 280AI.

Probably 24". I feel a long skinny case like .280 belongs in a full-length barrel. I'm not currently using any suppressor. If I wanted a comparatively short, suppressed rig, I would probably get an 18" 22 Creed, 6CM, or .243.

(Actually, I've already got a 18" pencil-barrelled 243 in a youth stock. Can't suppress it, but it shoots like a barn fire, rides great in/on a backpack, and is easy to carry and quick to to point when slipping through gnarly thickets.)

While I don't any hunting rifle to be heavy or unwieldy, I would accept a bit more length in the larger caliber gun/barrel meant to be capable on large game at a goodly distance.

 

[BringBackThe80s]

You could get an unknown munitions tikka bottom metal and mags and load the 280ai longer

That sounds like the best solution to all of this. Eventually I would like to put this it in a RokStok, anyway. (Though I wish the UM mags were a bit closer to being flush with the stock.) I.do like that about Tikka factory mags.

 

[pods8 (Rugged Stitching)]

I definitely don't think the .284 would get close to 3.34", even with something like a 190 A-Tip. I estimate it would be ~3.19".

See above the 160gr lazer (mono bore rider) I have loaded to 3.29”. If you got the twist rate there are even longer bullets. Not that I am suggesting them but it dispels the idea a 284 wouldn’t get close to 3.34”

 

[One300wsm]

See above the 160gr lazer (mono bore rider) I have loaded to 3.29”. If you got the twist rate there are even longer bullets. Not that I am suggesting them but it dispels the idea a 284 wouldn’t get close to 3.34”

That is similar to the 300 Super WSM running the Barnes 212 bore rider which works fine as a single shot, but try actually bolting one in feeding sucks in a long action. And I couldn’t get them to group very well. You just have a minimum amount of bullet actually going in the rifling. But if it works for someone thats awesome. I’ll stick with the short action wit 208’s coal 2.92 in Hawkins hunter flush mag.

 

[wind gypsy]

25 rpm. But if you must have a 7mm, I’d lean 284 like everyone else. Shouldn’t give up much to a 280AI if throated appropriately.

OR, get your hands on some shell shock 6.5 creedmoor cases (when they come out?) and stuff a bunch of RL26 behind a 147 eld in your creedmoor and save a bunch of money.

 

[pods8 (Rugged Stitching)]

That is similar to the 300 Super WSM running the Barnes 212 bore rider which works fine as a single shot, but try actually bolting one in feeding sucks in a long action. And I couldn’t get them to group very well. You just have a minimum amount of bullet actually going in the rifling. But if it works for someone thats awesome. I’ll stick with the short action wit 208’s coal 2.92 in Hawkins hunter flush mag.

Loads fine from tikka long mag and they shot well.

 

[One300wsm]

Loads fine from tikka long mag and they shot well.

You speaking of the 300 super WSM or the 284 ?

 

[pods8 (Rugged Stitching)]

You speaking of the 300 super WSM or the 284 ?

The 3.29” long 284 win round. The 3.13” one feeds fine also.

 

[MT762]

I think it's 284, 7x57, or a 280 with the unknown munitions DBM (if that setup really will feed a 3.45+coal, I have never seen one.)

My thinking is for the price of the Unknown Munitions DBM and two mags is that you can probably find a .532 bolt (or a donor rifle) and go WSM, either 300 or 7.

Downside of the 300 WSM being recoil with the weight of bullets you'd need to hang with the 7 (as someone else has already mentioned). But the WSM will hang. In one of my WSMS I run 212 ELDX's in a standard throat @2.95.

Or do a 7WSM. Basically the powder capacity as a 7PRC. Downside of the 7WSM being you are stuck with Hornady brass or sometimes finding big lots of Winchester and sorting it. But the Hornady brass is fine as long as you buy a few boxes of the same lot and do some minor culling.

My 21" 7 WSM runs 180 ELDMs at 2850 and that is limited by a 3.00 COAL. You'd probably get another 100 fps from a 24", more if you could throat it for a long COAL.

Anyway...maybe a bit off track...but sort of a question of how married you are to 30-06 bolt face when you're already dropping the cash on a barrel and getting it chambered.

EDIT: again, not that you asked, but a 7WSM with a 180 ELDM seated so the boattail is just below the shoulder/neck junction is 3.20". The case holds a sh*tload of powder. Throated appropriately, with a 24" barrel, you'd be over 3,000 fps with 180 ELDMs or at least have enough wiggle room to find a node around there.

Anyway...I'll shut up.

 

[One300wsm]

I think it's 284, 7x57, or a 280 with the unknown munitions DBM (if that setup really will feed a 3.45+coal, I have never seen one.)

My thinking is for the price of the Unknown Munitions DBM and two mags is that you can probably find a .532 bolt (or a donor rifle) and go WSM, either 300 or 7.

Downside of the 300 WSM being recoil with the weight of bullets you'd need to hang with the 7 (as someone else has already mentioned). But the WSM will hang. In one of my WSMS I run 212 ELDX's in a standard throat @2.95.

Or do a 7WSM. Basically the powder capacity as a 7PRC. Downside of the 7WSM being you are stuck with Hornady brass or sometimes finding big lots of Winchester and sorting it. But the Hornady brass is fine as long as you buy a few boxes of the same lot and do some minor culling.

My 21" 7 WSM runs 180 ELDMs at 2850 and that is limited by a 3.00 COAL. You'd probably get another 100 fps from a 24", more if you could throat it for a long COAL.

Anyway...maybe a bit off track...but sort of a question of how married you are to 30-06 bolt face when you're already dropping the cash on a barrel and getting it chambered.

EDIT: again, not that you asked, but a 7WSM with a 180 ELDM seated so the boattail is just below the shoulder/neck junction is 3.20". The case holds a sh*tload of powder. Throated appropriately, with a 24" barrel, you'd be over 3,000 fps with 180 ELDMs or at least have enough wiggle room to find a node around there.

Anyway...I'll shut up.

I really like the 7 WSM, hell I like all the WSM’s lol. My wife took this picture after shooting a bull this year 475 yards across this drainage with 300 WSM 208 gr ELD-M 2850 fps with a 20” barrel.

 

[NorthIdahoDude]

284 Win with a 175 ELD-X seated so the end of the bearing surface is right at the case neck juncture, is around 3.23-something, if memory serves. A 280AI with the same 175 ELD-X seated to 3.34 is pretty stubby, LOL. The 280AI would still get a bit more velocity even at that, but, it would cost it enough velocity that I would not consider the difference to be worth the extra powder burned.

I may have been wrong - according to QuickLoad calcs, a 175 ELD-X seated to the shoulder juncture is about 3.303 OAL.

Doing as much as I can for an apples to apples velocity calc in QL shows:

284 Win, 3.3 OAL, 56 grains of H4831SC, 60kpsi:
24 inch barrel: 2750 FPS
22 inch barrel: 2694 FPS
20 inch barrel: 2629 FPS

280AI, 3.34 OAL, 58 grains of H4831SC, 60kpsi:
24 inch barrel: 2782 FPS
22 inch barrel: 2724 FPS
20 inch barrel: 2658 FPS

So loaded to equal pressures, you'll get about 30 FPS or so more out of a 280AI.

To be fair, if you really believe your gun will blow up in your face at 63KPSI in the 284, but not till 65KPSI with a 280AI, then sure, you can lean on the 280AI harder. But here in the real world, you can load them both just as hot (or not).

Also for comparison, I ran quickload with 284 Win and the same ELD-X loaded to 2.81 OAL, which is what most 284 load data you'll run across says: 51.5 grains will get you 60 KPSI (down from 56 when seated long), and cost you about 60-70 FPS over my quotes above.

Similarly, if you seat that 280AI out around 3.65 OAL like I do in my Rem 700, it'll add about 30 FPS to those numbers above.

To be fair - all of the above assumes a lot of things (starting with, we believe quickload, which I don't entirely, LOL), and doesn't do a cacluation for the most efficient powder in both cases, etc, but it'll ballpark you for about how close the 284 Win and the 280AI will run when seated to Tikka OEM mag length.

YMMV