Yes, I do have rifles built very close caliber wisse, if you can swing it without sacrificing one or both builds; why not?
this is where i'm at right now.
30" AMU Contour w/brake
28" AMU Contour w/brake
^^^those two are twins.
Rem 700 S/A
7.82 Lazzeroni Partiot (30 cal short mag)
26" Varmint Contour BBL + brake
You've already got your 7-mag, so built the 300 first. That way you can take your TIME & build it the way you want it done. After having several customs built, I can offer you this advise, I wish I would not have skrimped on a couple things I differed on. As Shane said, a LR magnum caliber rifle really deserves a muzzle brake (or maybe it's the shooter who deserves it
). You have to practice a lot to become proficient & even a heavy weight mag can/will kick the crap out of you after a while. If I were to build a walking rifle, it probably wouldn't have a brake as quick shots are the norm rather than the exception. Think long & hard about what you want to do with this rifle, if it's LR ambush style (which is a LOT of what I do):
1- Heavy contour bbl
2- High efficiency brake
3- Comfortable stock i.e. McMillian A5- Manners T5-A etc. (I prefer vertical grips)
4- Quality low pull weight trigger (I bring this up because you mentioned Timney, I have one & hate it).
5- 20x or higher magnification optics: Your NXS is perfect here.
This adds up to a lot of weight, 13-16lbs is the norm here. I hunted exclusively with my 6.5wsm this year, at nearly 16lbs, it is VERY heavy to lug around. I only had to put on a couple miles & damn glad that was it, constantly changing grip, carry hand etc I can guarantee, there won't be ANY off hand shots with this heavy pig & 1lb Jewell trigger.
If it's a "gotta lug it around" Rifle:
1- Medium Contour bbl
2- No muzzle brake
3- Stock with different ergonomic characteristics i.e. the McM A-3
4- Maybe a 2lb or 2.5lb trigger on this rig. No 1lb'ers for me
5- Lower Magnification Optic range 15x- 17x etc Maximum to save weight
Can a light weight "walking rifle" be just as accurate as a heavy rifle? Accuracy wise, yes the RIFLE can. But it usually takes a very proficient individual to drive that light weight rifle as well, mostly due to significantly increased recoil & less stability when prone.
My point is: Can you have your cake & eat it too? Meaning, can we do both equally well? I don't think so, that is my experience. I personally cannot drive a light weight un-braked rifle as well as I can drive one of my "pigs'". I've proven it to myself several times. Maybe you can, I don't know. Just offering advise from a little bit of been there-done that.