Kimber mountain ascent 308 win

I would think his approach just fine, if one were to use *only* jacketed bullets, or use *only* pure copper bullets.

Apparently it's not a pristine bore that is the concern, it is the fouling from guiled metal and the fouling from pure copper that may not play well together. It is akin to how guilded metal (copper alloy jacketing) fouling can affect accuracy as well as promote leading when lead bullets are used without removing all copper fouling from the bore.

I too would like to hear more on the guilded metal / pure copper bore fouling subject.

Then again if your rifle shoots just fine regardless, and it would appear that it does, I am splitting hairs. It brings to mind a comment once made by Jeff Cooper regarding MOA: "If this rifle were half as accurate as it is, it would still be twice as accurate as it need be."

I suppose it is a concern for the very reason we want to first foul a clean bore to begin with; to lay the same material onto the surface of the bore that the particular bullet consists of. The word "fouling" in this case is a good thing, and not to be confused with the condition of a neglected bore.

"Gulded" metal is an alloy of copper and whatever else, and is typical of what is used to jacket a common, jacketed rifle bullet. It is a harder material than that of a pure copper bullet. The Barnes TSX and TTSX (polymer-tipped) on the other hand are made of pure copper. Why am I even broaching the topic? Because California. It's on my radar because beginning July 1, 2019, bullets used to take game must be non-lead, so I am exploring options.

The good news, however, is that those folks that are already using the Barnes pure copper spitzers are very pleased with their performance. In some cases, hunters and shooters are using them in other parts of the country where they may still hunt with lead. That is a notable endorsement. I have a stash of various bullet weights Barnes ready to go but have not constructed any of my own ammo with them yet.

house stark said:

Montana in 7-08. $1,100 and the best day of my rifle owning life was taking a $400 hit to get rid of that thing. It was a piece of crap.

EVERY round jammed on the feed shoe. I saw a pic from a guy that had the same problem. Kimber took a dremel to it and sent it back. When I called Kimber the guy said he'd never heard of the problem.
I would have loved a 2" group, mine was closer to 4" on average. Many boxes of factory ammo and a few hundred reloads.

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Bad luck. I have a Montana in 308 and one in 300 WSM. They both shoot under an inch.
I bought them both used. Someone had bent the firing pin on the 308. And the 300 had a slight feeding problem. Both were easy fixes.

Don’t try to assess the accuracy of a new barrel till it has at least 200rds down the bore!
I’ve had too many rifles, some $$$$ that took that many to fully “break in”, for lack of a better description.
My feather weight .257Roberts took nearly 300rds to settle in. 40yrs later, even with some honestly earned pitting, it’s still sub MOA, though it didn’t start that way. Another is a Colt Lt Rifle in .30/06. Bought used, it still took an additional 150+rds for it to settle down. It’s now my second most accurate rifle! Consistently Sub MOA. My MOST accurate is a Remington M700 ADL synthetic. It took 200rds (also bought used), to settle down. With a 50-55gr Sierra over 39.0gr H380 it will frequently shoot 4-in the same hole, occasionally 5 in one... My CMP Service match rifle is a RRA NM with a stainless Wilson match barrel. It took nearly 300rds for it to settle down to 1/2 MOA accuracy.

Most recently, a used Marlin .308MXLR has come my way. At ~150rds in, and it’s starting to “come around”. Last 5-shot group with factory equivalent loads are now down to under 2-MOA. I expect within next 50rds, it may approach 1moa...
Give it time, and ample cleaning!
CHOOT IT !...

Added; So what if it’s just a 2MOA Rifle?
My favorite hunting rifle is a circa 2004 Rem Mod-7 in 7mm08. Its only a 2moa shooter. But my-oh-my what a “lucky” slayer of big-game!!! 40+ deer, 2-pigs, a 6x6 Bull elk by a friend, and several coyotes. And it’s not my primary rifle!
It just works! And is a joy to carry and hunt with.
The late Col. Charles Askins developed and hunted with many custom and wildcat cartridges. His personal standard was “under” 3moa...