The only thing that can tell you when a bore needs cleaning is the barrel, and the weatherman. From what I've seen of hunting near oceans I'd be cleaning constantly if I lived near one, but since I don't practically never is a better plan. I'm bound to get rained on before it quits shooting for being dirty.
Back to kimbers, 3 of my 5 have forend pressure pads. Two because they were determined to shoot better that way and one because it was alresdy touching so I tried it that way first. It shot well enough that I gave it a little dab of Devcon to make it look like it was planned that way. That particular 7 Rem was one of those oddities that shot better if it was meticulously clean and startied opening up after s very few groups. Took a little while to figure that one out, and about that time Crazy Davey told me about ULtra bore coat. Fixed that right up and it is in the ever clean pile now.
All my Kimbers have smallish chambers, which is likely what they mean when they say match grade in their promotion material. As near as I can tell brass seems to want to last forever. It does seem to affect powder charges or at least something is. My 22/250 cavorted load is minimum by Hodgdons data and maximum by Noslers. Either way it has zero pressure signs and is faster than both. The 338 Win matches book speeds with lighter charges and calmly out runs the book with listed max charges. The .270 WSM will take listed charges and dish up screamer speeds. The 300WSM wants a load 1 grain above minimum but delivers the velocitiies of the Max loads. I wouldn't want to load it any hotter. The 7mm seems to deliver book speeds with book loads, depending on the book. I've learned to never try to out guess a Rem mag.
Not a slow barrel in the bunch.