6-.284 build ?

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powder monkey

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I have a Remington 700 .308 action.

I want to build a 6-.284 with a 28" 8 twist tube.

Someone with experience want to tell me about building this rifle on a short action?Or should I just wait for a LA?

Thanks Guys!!
 
The only issue is that if you wish to unload an unfired round, you can only do so by removing the bolt. Otherwise a spent casing ejects JUST fine from a short action. I have built 6.5-284's on short actions and they work fine. The next project is a 6.8-284 and it is also on a short action. I sell 7mm barrels to lots of shooters building 284's on short actions too.

Glad to hear you are going 8 twist. 7 twists are too much for heavy, long bullets like the 115. "donp" on CGN has a 6-284 and it is blowing up 115's as it is too much twist.
 
6-284

I know this one well and would NOT build in this caliber. It is over bore, & hard on barrels. If you want something that will drive 6mm bullets at higher velocities the 243 ACKLEY will do it, granted it is hard on barrels too, but not as much as the 6-284. The 243 A will drive 105gr bullets into the 3100 fps range, but for accuracy I find the 2950-3030 FPS is best. It works fine out to 1000 meters.
 
A 6 Dasher easily breaks 3000 with 105's and uses far less powder than a 243A (of course, the Dasher is really a 6BR 'Ackley') and has twice the barrel life.
 
Your building a 90s rifle. 6.5/284 won,t run with the strait .284 win using 180gr bergers when the winds are up at 900 & 1000y and 90% of events are won at the long ranges
go with a 32" Barrel if you can tough recoil maybe the short mags are way to go
 
powder monkey

i think the 6x284 would be a real barrel burner aswell.if i was going to build something different i would neck down the 6.5x47 lapua case to 6 mm.just my 2 cents..
 
Look at 6mmAI as well. I shoot 6mm Crusader, which is essentially the same. I'm past 1500 rounds and its still holds 0.5 MOA. My standards load is 115 DTACs @ 3125 fps with Retumbo. That is where the accuracy is, but it'll launch them at 3250 fps. at maximum load and will do 3400 fps. with 105 gr. bullets.

If you want to shoot the 115's at a high velocity without blowing up bullets, get a barrel with 1-8" twist or 1-9" down to 1-8" gain twist. Get 5R rifling, NOT conventional rifling and get the 0.237" bore NOT the 0.236" bore. And the DTACs are the way to go. They have thicker jackets and the new pointed ones have a BC of 0.590, which is higher than the Berger 115's. They are also not a VLD and aren't fussy at all about their distance to the lands. I've never adjusted my COAL, since I'm feeding from the mag.

6mmAI has a reputation as a barrel burner because most are shooting light varmint bullets with fast burning powders at really high velocities. That will toast your barrel much more quickly than shooting heavier bullets with a slower burning powder at a lower velocity.
 
manitou210 said:
Your building a 90s rifle. 6.5/284 won,t run with the strait .284 win using 180gr bergers when the winds are up at 900 & 1000y and 90% of events are won at the long ranges
go with a 32" Barrel if you can tough recoil maybe the short mags are way to go
Click to expand...

He's talking the 6mm variant

How about 6xc?Should be able to drive em around 3000 too.
Click to expand...

closer to 3200 with 105's. Mine does anyway
 
Here is a build of a 6mm-284
http://www.6mmbr.com/gunweek019.html

My guess would be that you are going to use it as a varmit gun and if so the shorter bullets 55,60 70,75 should work just fine in a short action and magazine system. confirm OAL and magazine length before committing to the project... pills longer then 100 will require you to load individually.

here is an excerpt from another article found
The 6mm-284 is most easily created by necking down the 6.5mm-284 Norma case, which is a direct conversion. However, it is possible to neck down the .284 Winchester case. When combined with heavy (95-, 105- or 107-grain) VLD target bullets, this number produces spectacular long-range ballistics and has been used successfully in 1,000-yard target matches. However, a more likely application is long-range varminting. With slower-twist barrels and lighter bullets, the 6mm-284 is capable of spectacular kills at unusually long ranges. For example, with a 26-inch barrel, it easily launches 70-grain moly-plated Nosler Ballistic Tip bullets at 3,900 fps. With a well-built gun capable of launching this bullet with sub-1/4-MOA accuracy, very long-range hits on vermin are completely feasible.

It seems to be a popular round for varmint
http://vha.activeboard.com/index.spark?aBID=103530&p=3&topicID=22815968

good luck and let us know how the build goes.

Trevor
 
I'm not sure I'd call it a "popular" catridge for varminting. It is horribly overbpre with an accurate life of between 500 and 750 rounds. Maybe in the US where they can get barrels for almost half of what we end up paying up here, but I sell VERY few barrels destined for 6mm-284 builds.

They do work very well, but VLD bullets require that you adjust seating drpth every 30-50 rounds as the throat vaporizes.
 
Lots of meat. Don't have my caliper handy but it's around .875 at the muzzle and 27 inches from the recoil lug. I'm getting 8 and 12 twist 6br's done and I have a 243 Ack so I'm looking for something different for this tube when the throat goes. Thought I might try a 6 Dasher. Is this barrel long enough after it gets set back or would you have another suggestion for something interesting.
 
bedrock said:
Lots of meat. Don't have my caliper handy but it's around .875 at the muzzle and 27 inches from the recoil lug. I'm getting 8 and 12 twist 6br's done and I have a 243 Ack so I'm looking for something different for this tube when the throat goes. Thought I might try a 6 Dasher. Is this barrel long enough after it gets set back or would you have another suggestion for something interesting.
Click to expand...


You need to know the diameter at the breech. 1.200" good minimum for Remington. My 6/284 barrel eroded about 1" per 100 rounds. At 700 rounds barrel was checked, alligatored, and cracked to 7"

NormB
 
Mine would be at least 1.200 at the breach but from your experience Norm it appears it may be a waste of time to set it back or be prepared too shoot a fairly short tube.
 
I have a couple of .264WM's. While they are not target guns their, accuracy went down hill after 800-900 rounds or so. One which was CS has the barrel replaced and the other in SS lasted a little longer, but also needs a new barrel. It won't be another .264WM. They are barrel burners for sure.

This said, I find the reports on the 6.5x284 barrel life a bit pessimistic, especially if they are SS. I suspect some of it has to do with the subjectivity of what is burned out and what is not, as well as what accuracy is acceptable. A forumula by Bart Bobbitt gives an expected accurate barrel life of about 3000 rounds for a .308 Win. Many will claim they get more and some less, but I think it is reasonably accepted.

For a .264WM it comes out with about 900 rounds which matches my experience fairly closely. So how does the .264WM compare to the 6.5x.284 for overbore capacity? The 6.5x.284 uses about 48 grains of H4831 behind a 140 grain while I use 62 grains. That is an increase of 30%, and a very significant difference. The Bobbitt formula gives it 1600 rounds.

I believe one strategy being used by long distance target shooters to get this full 1600 round life, is to run 800, and then set the chamber back, and run another 800.

Just my thoughts on it,
 
Ron, He is talking about the 6mm variant, not the 6.5, so it will be even worse. Also, my last 6.5-284 was toast at 750 rounds. Never count on more than 1000 accurate rounds out of a 6.5-284. Precision shooters would likely not go to a 250 round match with 8-900 rounds down the pipe.

The 6-284 has an overbore index in excess of 1400, making it as overbore as a quart jug of milk
 
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