LV,
You bring up valid points, to some degree but you out a pretty low velocity limit on the big 338s. I have no experience with the others but am a bit familiar with my 338 AM. In a 33" barrel, its no trick at all to push a 300 gr SMK to 3400 fps. So lets look at the numbers with that comparision compared to a 338 Improved which my 338 AX is very similiar to as well, and again, a GREAT round.
Here are the numbers out to 2000 yards for the 338 AM with 300 gr SMK at 3400 fps w/ a 500 yard zero
Yards....................Velocity..................Energy...........Drop
500.......................2856......................5433..............5.5 moa
1000.....................2374......................3752..............15.5
1500.....................1943......................2514..............29.0
2000.....................1565......................1631..............46.75
here are the same numbers for the 338 AI with 265 gr AT at 3250 fps
500.......................2779......................4544..............6.0
1000.....................2354......................3261..............16.75
1500.....................1971......................2285..............30.25
2000.....................1628......................1559..............48.0
As you can see, the 338 AI does pretty well but it WILL not match the 338 AM in any catagory out to 2000 yards except in velocity at ranges past around 1400 yards or so. Drop is less for the the big 338 AM and energy is also better.
What always kills me is how those that come up with new ideas to better smaller rounds do not think to put that same technology into the larger rounds. I have shot the 265 gr Hats a bit in my 338 AM. They shot well but I did have two that mysteriously did not make it to the target which does not impress me. They were the original design however and expansion was not consistant at all, still, for the ones that I shot for accuracy results on paper, they did shoot very well. I drove them to 3550 fps and did not get as high of a BC as you are reporting. It was close however at around .88-.89 at that velocity.
I did test the prototype 265 gr Wildcat AT RBBTs and they produced a bullet drop derived BC of .960. Since the Wildcat bullets are in limbo for now until the business starts up under new owners, lets use your numbers for the HAT bullets on my 338 AM. Again, 500 yard zero, 3550 fps.
500 yards...................3045 fps..............5455 ft/lns..............4.75 moa
1000...........................2596....................3961......................13.75
1500...........................2187....................2815......................25.0
2000...........................1821....................1951......................39.25
Absolutely no comparision at all in any way. So the same advantage that the modern bullets gives to the smaller chamberings, it also gives to the big boys. So yes, you can say that a 338 AI shooting these high BC bullets can come close to matching a 338 AM using conventional bullets but with both are compared using the same bullet, there is NO comparision at all.
Another aspect, if your looking at the extreme range shooting ability. To be extreme range is past a mile until the bullet drops below super sonic velocity. My 338 AM with the HAT bullets will give you super sonic velocity out to around 3375 yards at my 3500 ft elevation. The 338 Lapua Improved will do very well and will carry super sonic velocity to right around 3000 yards. Both a hell of a long way for sure but for those wanting the longest reach possible, the 338 AM class rounds with the new bullets will get you nearly a 1/4 mile more reach with super sonic velocity and no worries of bullet stability.
This is all on paper mind you. I have tested the Wildcat AT RBBTs to 3008 yards and they easily held 1 moa at that range in my standard weight 19 lb 338 AM so obviously velocity is well over Super sonic velocity at that range.
I would agree that the new bullets turn the smaller rounds into very high performance rounds, but they take the big magnums to an even higher level of performance, never before seen. I am not aware of any shoulder fired conventional rifle that will hold super sonic velocity over 3300 yards in a 33" barreled 19 lb rifle.
Anyway, you bring up good points but they are better served to those that already have a Lapua, or RUM or Edge or Lapua Improved or AX or Ultra Maxx and want a bit more performance. If someone is looking to buy a new rifle and want the ultimate in 338 performance, they may or may not be better served to go with the larger 408 based rounds. Rifle cost is nearly identical, in fact in some cases, the larger calibers can be no more then the conventional rifles in any way.
Brass is not terribly different, especially if you have to form the Lapua wildcats your self. 408 brass is basically the same price as Lapua brass. Maybe not quite as good quality but plenty good for 4-5 firings at top end pressures and obviously they are accurate enough to get the job done at long range.
I think it comes down to which chambering fits your needs better. If your going to be shooting or hunting out to a 800-1200 yard range, there is no need to go larger then the 338 Edge, Lapua class chamberings. IF you are serious about pushing past 1500 yards and especially past a mile, and are serious about it, you WILL get better performance with the big 408 CT based rounds and they will make hits easier at those ranges.
You are correct however, if someone already has a medium level 338, they can give it a hell of a boost in ballistic performance is they start using the new modern bullet designs over the 300 gr SMK and especially those like the 250 gr SMK.
I certainly do not want to pick any fight with this post, just want to show that what these bullets do for the smaller chamberings, they also do for the big boys as well. Thats the only reason for my post.
Hell, I would like to see a 250 gr bullet as long as the Wildcat 265 gr AT RBBT with an aluminum insert that extends down much farther into the case body so we could break over that 3600 fps level with mild pressures and BC numbers in the mid .9 range. That would be special!!!
Imagine super sonic velocity out past 2 miles!!!!! Thats what we need next.
That and a reasonably priced range finder that would let us range this far consistantly!!! LOL
Good points.