Lone Star, like you said, IMO ! I would say you are entitled to that, but I have my chrono results & that trumps opinions, sorry!!
And a few facts sprinkled in, instead of opinions, as noted below.
It could be that my loads for the 25-06AI are a little warm, just as your loads are 200 feet over Wea. factory & are by your admission
quite hot. And I have mentioned in the past how I have received those velocities with properly set up 25-06'sAI, that being 26" barrels &&&& LONG THROATED MODEL 700 long actions, I am sorry I didn't again. And I said 100FPS, SOMETIMES 75, depending on individual guns & loads. Did I take into account a 257 getting 3,800, no because that is not the norm. You say 3,600 is safe for your Wea. & I say 3,500+ is safe in my AI, no problem.
I like manuals too, let's look.
Manuals are good guidelines. Both the Sierra & Horn. shows 3,500 fps for the Wea., but I know 3,600 is safe, so I would not consider a source or 2 as gospel on Wea. or AI data. What's really funny is the Speer number 13, they show the std 25-06 with 3,298fps with a 24" tube & the Wea. with 3,370, again with a 24" tube for a diff. of 72fps. To me that is silly, again I agree with you that 3,600 is more like it, at least in 26". Barnes #2 shows 3,302fps for the 25-06 & 3,484 for the Wea, both with 24".
The Nosler #4shows the 25-06 with a 24" tube to max out at 3,353 & the 257 Wea. with get this a 26" Lilja to get 3,602 for a spread of 249fps even though the Wea. has 2" more barrel, Hmmm.
Looking at my stack of manuals (all of the majors) we have a spread of 72fps as a low & I found one at just over a 300 foot spread.
The average is about 200fps, just like I said in my post.
You say yourself the AI gives 100feet per second, well that would be right where I said to begin with. And looking at the manuals, my claim is substainuated, even easier than I suspected. When you look at the numbers, no magic is suggested or implied.
One the other extreme, Cart. of the World Number 9 shows 3,646 with the AI, a little fast in my book. Yes, I can get that & a hair more, but it is hot. Actually, the 25-06 has a little more gain than 100fps. Some like the 30-06AI or 35Whelen AI are lucky to gain
100fps. On the other hand the 30-30AI, 257Rob. AI & 250-3000-AI will gain alot more than 100fps, fact. Non AI users use 100fps as a blanket rule, not allways so.
No where has it been stated that the 25-06 will match the Wea., but as it always goes, as you go to a bigger round the gain is there,
but not proportion to the powder increase. The STW is faster than the Wea., giving another big gain, but not a good tradoff in my view considering the HUGE powder increase.
This is what I have experienced, if you have your own 25-06AI that differs, fine. Viewed logically, it is easy for anyone to see how this is achieved, & as I said, the round is too close to mess with the belted brass & inferior & a gun that is harder to achieve target accuracy standards.