Millerlite, I am building a 6x284 too. I am building my 6x284 for long range squirrel hunting. I am also bulding it to be very stable, so it's going to be heavy. I will shoot it off the bench or prone with Bi-pod. Here is what I would recommend for your project;
1. Action-Nesika Model K or L, or a BAT 8.5.
2. Barrel-30" or 28" Krieger or Lilja. I would go 30"
3. Twist Rate-1-8.5 or 1-9 depending on what barrel you choose.
4. Stock-McMillan A-5 or Tooley MBR.
If your going to be shooting off the bench a lot, I would go with the Tooley MBR. You can have a removable stud put on the MBR for Bi-pod use for shooting off the truck or shooting prone.
5. Trigger-Jewel or Shilien.
Both of these triggers are awesome. I like the Jewel trigger the best, it seems to break better for me.
6. Muzzle Brake
-Vias or Holland.
Both are great brakes. However, I like the Vias the best. I think they tame the recoil better. Also, I mostly shoot off the bench, so I don't worry about blowing sand or dirt. The Holland is a good brake if your going to be shooting off the ground a lot. With the Holland brake, you wont have to worrie about blowing sand or dirt.
7. Scope Base-Davidson.
8. Scope Rings-Kelby.
9. Scope-Nightforce or Leupold.
I am a Nightforce Man but Leupolds are good scopes too. I would at least go with a Nightforce 5.5x22x56mm NXS or a Leupold 6x20x50mm LRT.
Regarding the twist rate for the 6x284. If you go with the Lilja, go with the 1-9 twist. + Kirby has done the research with this twist rate in the Lilja barrels, so he knows they work.
However, if you go with Krieger, go with the 1-8.5 twist. When I was ordering my Krieger Barrel, I originally wanted the 1-9 twsit. However, Krieger recommended a 1-8.5 twist over the 1-9 for the 6x284 using 105 and 107grn bullets. They said the 1-8.5 twist is working very well with 105 and 107grn bullets.
Regarding Action, I've used both Nesika and BAT. They are both awesome actions so no matter what one you choose, you will be very happy. I chose the Nesika Model L with a 1.700 diameter for support for my large barrel.
Here are the specs for my 6x284;
1. 6x284 Match Chamber for Lapua Brass w/.272 tight neck.
2. Nesika Model L, 1.700 Dia. Fluted Bolt, Tac. Bolt Knob.
3. Krieger 30", 1.8.5 Twist, 1.450 Straight Cylinder, throated for the 105 and 107grn bullets.
4. McMillan Tooley MBR, 5 Pounds Lead added to rear, removable stud for bi-pod use.
5. Jewel 2oz Trigger.
6. Vias Muzzle Brake.
7. Davidson Scope Base with 20MOA Added.
8. Kelby 30mm Rings.
9. Nightforce 12x42x56 NXS with MLR Reticle.
10. Overall weight will be 31 pounds.
As you can see, I am going with a pretty heavy rig. I will be shooting of the bench most of the time, so I want it to be very stable. Trying to hit these small ground squirrels at 1000 yards is pretty tuff, so I need this rig to be stable which will allow me to view my misses through the scope.
Regarding bullet choice, I am going to focus on using the Lapua 105grn Silver Scenar with a BC of .530. The Silver Scenar is a moly coated bullet. I've heard and read that this bullet is perfoming very well. There is a good article on 6mmBR.com about the Lapua Scenar. I am looking to push this bullet between 3200 and 3300fps.
Regarding powder, I am looking at the following three, Vhitavoria N160, Reloader 22, or Reloader 19. I've used Vhitavoria before and it worked real well.
Regarding Brass choice, Lapua is the best brass for the 6x284. Norma makes brass too, however, the Lapua Brass is much better.
Anyhow, if you have any questions, you can e-mail me at;
Please, keep us informed about your project. Your going to love the 6x284 for varminting.