This guy and I would be friends.
"But part of the fun in reloading is ruling out variables and making the most consistent ammo you can. Premium components is a big part of this."
It depends on what you’re end game is; if you’re just looking for best groups then probably it’s not worth the money in a .308 platform at those distances. But reloading for me is an end game in and of itself; I view it as separate and distinct from the actual pulling of the trigger.
I get tremendous enjoyment out of the solitude, precision and the blend of science, chemistry, math and physics. I think you can get to good groupings fairly quickly during the load development process but for me that was not the point. I’ve been doing load development with my .338 Lapua for almost a year now looking for that magical blend of fairy dust and engineering that will not only give me .15 MOA groups but an ES of <2 and a SD of <1.
I may never get there but I’m having a heck of a good time trying and I’m more than happy to invest time and money into components and equipment that may only yield small measureable results or no measureable results at all. You don’t always know unless you try. Since you are asking the question (good) I would suggest that you go and answer it; invest in the more expensive brass and run some side-by-side tests. If nothing else you will enhance your reloading skills and most importantly have some fun doing it (that’s the point, yes?)
If you can measure the results then you will have your answer, in this case whether better brass produced better results (at least for you). Then go see whether annealing helps or maybe neck turning? Primer seating? COAL? CBTO? Dies? Presses? Trimmers? Will I get better results with more accurate calipers, micrometers, OAL gages, concentricity gages, scales? And on and on…
Reloading for me is a hobby (vocation?) that just happens to produce a result I can use in another one of my hobbies. Creating cartridges that are as identical as humanly possible is as enjoyable for me as shooting good groups. Let us know what happens.