Here's an Adirondack I owned before Christmas, it was 4lbs 15ozs bare rifle on an accurate scale, factory 16.5" barrel. Now, if I was to do a Howa mini in 300 HAMR' or 300BLK nearly identical to yours with a 16" light contour barrel I should come in an ounce or two over 4.5lbs. besting the Kimber by a quarter pound at the very least.
Comparing prices that Kimber is a 2500$ rifle and I know for a fact it wouldn't shoot close to a custom barreled Howa, in fact I wouldn't bet money that it would beat out a stock mini in the accuracy department.
In a nutshell, if I have 2500$ to build a 16" .30cal stainless IBI barreled Carbon stocked Mini it would stomp that factory Kimber into the ground and best it in all categories except the SS action...and even then I'd probably have the cash left over for a custom Cerakote job.
Of course I realize this means nothing if we are talking about .308 sized cartridges and not STANAG mag length ones...but this is a thread about the 6.5G!
Now that is a work of art. Stainless, perfectly Swiss cheesed, control round feed, quality stock, overall quality fit and finish throughout. I would take that and since so many do shoot well I'd find out and have a dandy smith who would have it sorted if not. You could spend all 2500 on the howa and still not get close to that rifle. Again, accuracy is one part of the equation, not hard to fix, but the downfalls of the howa are, it's a bargain built base level tool, you feel it everywhere, in handling both...it would be very apparent which one was a high end high quality tool and which one was the pig with lipstick.
Just in case you haven't heard me say it about the stocky's carbon stock, even it is a long ways from this level of quality and feel, it's finish is porous, they must get them out the door before while clear coats still soaking in. The recoil pad is garbage and oversized, super tacky and cheap af, then the butt stock is hollow and makes that super cheap sound as soon as you touch it. So it's scaled properly, and it looks ok, and the weight is proper, but it's far from a high level of fit and finish and is below the value paid for it fyi. I think the Pendleton stock at 1 oz heavier would be far better for the howa and meet the minds expectations better than this carbon did. You may notice on mine I did some trimming on recoil pad and maybe I could see what is or isn't in the butt stock and throw some great stuff in there to make less hollow cheap sounding? Eh, but don't care at this point, the whole rig matches in its base level quality, shoots ok, should hunt fine. Time will tell but pride of ownership will be nothing like it would with that Kimber.
I took 3.0 ounce out of my action and 3.5" off the 22" standard barrel and have a bare rifle at 4 lb 10.5 ounce. I'm not sure the howa carbons are meeting their advertised bare weights in real life. Something to look into. Good news is the Jefferson bottom hinged is the same weight as the factory plastic garbage...3.0 oz. I think maybe with a light contour 16" and the action work you could get lighter than that Kimber but you're going to spend some time with the smith to do it. I ended up with great balance point on the front action screw with a really light scope/rings options so bonus, how will the 16" light contour go? Might be alright if you go Talleys and the 6.5 oz fixed 2.5x ultralight from leupold, or a red dot? If Kimber would chamber the 6.5g the howa would be for sale the same day and I'd hunt my ruger until my Kimber showed up lol.
Edit: howa carbon weights for real, you may see them 6 oz over factory advertised, there's 2 in this thread (a 6.5g and cm), and having my experiences with them I agree, there's no way they will come from the factory as light as they suggest, sounds like a lottery on weight like accuracy is for Kimber lol. And my stock was advertised at 17.0 oz, but maybe that's for the bull barrel inlet?, the sporter inlet came at 18.0. So you're unlikely to achieve the weights you're talking about with the howa's, your Kimber is about as light as you'll ever get, you will have to heavily mod a howa to meet that Kimber.
https://rokslide.com/forums/threads/howa-superlite.258050/page-2
Edited my final weights on my build.
Bare rifle is 4 lb 10.5 oz.
53.5 oz barrelled action with action screws (3 lb 5.5 oz, slabbed/fluted -3.0 oz, and 3.5" barrel chop to 18.5" at 1.5-2 oz/inch should be 5.25-7 oz reduction there, so I've taken 8.25 to 10 oz out of the metal, making factory carbon stalker weight in the 5 lb 2.75 oz to 5 lb 4.5 oz range)
11.5 oz scope/rings
3 oz bottom metal
18 oz stock
86 oz total (5 lb 6 oz)