Originally Posted by Outlaw6.0
Kirby, it was my understanding that the 6-06 & 6-284 shared nearly exact case capacity. What is your performance experience with the 105-107 grainers in the '06 case?
You're right about feeding. My x284 feeds from the HS long action DBM, it's a little klunky, reliable but doesn't have the "smooth as glass" feeling if that makes sense.
If the 6-284 is loaded so the bullets are seated to the base of the case neck, YES, they are very similar in case capacity. In reality, the 06 has a slight edge in capacity so all else being equal, the 6-06 will produce a bit more velocity with same length barrels but very close.
Main advantage with the 6-06 is that it feeds like its not even there, smooth as butter. That CAN NOT be said for the 6-284, especially if using a staggered feed mag box design such as the standard Rem 700.
Plus, the rebated rim design can at times cause some issues with feeding.
There are no problems at all with the 6-06 for feeding, nice shoulder for feeding, good full diameter rim, nice case length. While its an extreme chambering for sure performance wise, its a dream to build rifles for and if used for its appropriate usages, it does very well.
A 6mm-06 loaded with a good 90-100 gr bullet will do ANYTHING the 25-06 will do with a good 100-110 gr bullet. Both are designed for use on the exact same game species, light to medium big game at moderate ranges. If you want something a bit different, the 6-06 is a fun little round to work with, extreme performance, no fireforming needed, easy to load for.
The 105-107 gr bullets can be easily driven to 3400 fps in standard 24" barrel lengths and longer barrels will drive them to 3500 fps.
Some care must be taken if your looking to run at full velocity potential with these bullets in the 6-06. My main tip, go with a 1-9 twist barrel instead of the 1-8 which conventional wisdom will often recommend. The 1-9 is plenty to fully stabilize these bullets, the slightly lower RPM levels help them on impact a bit better and it also allows higher top velocities with good accuracy then 1-8 twist will offer. That is especially true with the berger and A-Max bullets. The SMK is pretty tough, no real issues there with speed and accuracy. I have driven them over 3600 fps with fine accuracy. That is to hot for a 6-06 by the way!!!
The 6-06 Ack Improved is a round that I get asked a lot about from guys wanting a laser flat trajectory but in all honesty, its just to much capacity for the 6mm and the standard 6-06 takes out best 6mm bullets to their velocity limits with accuracy and its also a much better feeding design then the Improved version.
The best bullets in 6mm just do not seem to offer enough resistance to this large capacity(for a 6mm bore diameter) for consistant powder ignition. I have always had better velocity spreads with the standard 6-06 then I have with its improved brother.
Again, the improved version just does not offer the advantages in velocity either compared to other wildcats on the same case. For example, a 25-06 AI, 6.5mm-06 AI or 280 AI offer 125 to 150 fps over what the parent case with offer with same bullet weight in same barrel lengths. The 6mm-06 AI does not offer this advantage, its much closer to 50-75 fps which in my opinion is just not worth it for the chore of fireforming and again, the velocity spreads just seem to grow with this design, which I believe is simply because we do not have enough resistance to get consistant powder ignition.