Example: 10 300wm rifles with 26" barrels

Assumptions:
1. Same barrel volume
2. Same twist rate and contour
3. Floated and bedded same length

Is it safe to say that all of these guns would have the same (or close to the same) "perfect" load recipe?

No. It might be possible, but very, very, and very unlikely.

While you can find a "decent" load that will proform OK in all of them (say 2moa at decent velocity), hell, the factory does that all the time.
You won't find "the one load" that is going to produce top velocity and (say) 1/2moa groups in all of them.

I thought if I bought 2 "identical" Win 70 300 win mags, the "optimal" loads would be almost identical. I stand corrected.

No, I had two Model 700 VSes and one liked the 52gr Sierra MKBT bullet and the other perferred the 53gr Sierra MK(flat based) bullet.
Not by a whole lot but enough that I keep a seperate supply of bullets for each one.
I think you could get a load that would be close enough for hunting purposes at normal distances and I think that you could even find a powder and a common bullet that would work among them. But, for their best work, I think each one would need some individual tweeking at least.

load them between -.025 and -.035 and a middle load .. they'll shoot pretty decent .. unless barnesX type , then back it WAY off ...

not the best for any rifle, odds on, but should shoot okay, if they are ALL off the lands

I agree that every rifle has its own special load data. You just have to find what it likes and dislikes. It really depends on what you want out of your rifle.

I have a friend who works in the Sherriff's department in a small town in Texas. They were all issued .308 Remingtons of some model. His and his buddy's serial #'s are separated by 10's. His shoots a totally different load than his buddy's for optimal accuracy.

So much for my "logic" Thanks as usual guys.

One of these days you will wind up with two rifles in the same caliber. You can test your theory yourself and find out some loads will perform the same and others will not.

I think the answer to your question about "is there a scientific way to the perfect load" can best be answered by HC.

"The Never-improved upon Creighton-Audette Method"

quote:

Is it safe to say that all of these guns would have the same (or close to the same) "perfect" load recipe?

Not even close.