Chuckster, first of all the 6x284 is the fastest and most accurate 6mm out there. The 6BR is the most accurate, however, the 6x284 is fast and very accurate. My last 6x284 was awesome. It shot the 87grn V-Max at 3730fps, from a 30" barrel, and it printed groups in the 0.1's.
I am currently having a new 6x284 built, I will get to that later.
I love the 6x284, yes it will burn a barrel out faster than some of the other slower 6mm's. However, it's worth it. The 6x284 will shoot a 105grn bullet at around 3500fps and the 87grn V-Max at 3700fps wih the right components, now that's awesome stuff.
If your going to use the rifle for 300 and 600 yard benchrest compitetion, than seriously look at the 6mmBR. However, if your going to use the rifle for long range varmint rifle, the 6x284 is your best choice. There are many positives for using the 6x284;
1. Awesome Brass.
2. Great bullets.
3. The best 6mm for long range varminting.
4. Low recoil.
5. You will out shoot all your .22 cal and slow 6mm buddies.
Chuckster, here is the specs on my 6x284;
1. 6x284, .272 tight neck with Match Chamber.
2. Nesika Model L, 1.700 Dia.
3. Krieger, 30", 1-8.5 twist, 1.450 straight taper.
4. McMillan Tooley MBR, 5 pounds added to rear, front stud for bi-pod.
5. Vias Muzzle brake
6. Jewel 2oz Trigger.
8. Davidson base with 20MOA
9. Kelby 30mm Rings.
10. Nightforce 8x32x56mm NXS, NP-R2 Reticle.
11. Total Weight of rifle 34 pounds.
I went with the large diameter action so I could use a large 1.450 straight taper barrel. I wanted this rifle to be very stable for the long shots.
The load I mentioned above, with 87grn V-Max, is as follows;***Remember work up to this load, don't start with it!!!
1. 52.5grns H4350
2. Hornady 87grn V-Max (.400 BC)
3. Lapua Brass
4. Federal 210 Match primer
5. Velocity in my 30" barreled rifle was 3730fps
6. Average 3 shot group at 100 yards with this load was in the 0.1's & 0.2's. Also, the rifle I shot this load with was a fully custom rifle
Good luck Chuckster, go with the 6x284, you will love it!