I actually happen to own a C20, or at least the closest that any of us are likely to get to one - the original, monolithic upper-receiver Colt USA LE901 Gen 1 in .308. Mine is a sub-MOA performer out to 800m with 175gr FGMM firing SMKs, however I can't speak to extended ranges as I was never able to shoot it past 800m before the OIC hit. There is nothing that my bolt-action .308 CADEX Guardian Lite can do that the LE 901 can't equal, and that is a fact witnessed (and fired) by the proprietor of Sierra 64 Riflecraft here in Edmonton, a retired CAF Master Sniper. There is absolutely no reason for the C20 to be relegated to relatively short-range "DMR" use, aside from the inherent limitations of the .308 cartridge. Manufacture the C20 in 6.5mm and then you'd have a Semi-Auto Sniper System (SASS) capable of accurately reaching out beyond 1200m (at which point the comparatively feeble .308 is already sub-sonic). The only reason that the Timberwolf would be used in preference to the C20 is the additional range offered by the former's .338 Lapua Magnum chambering. All other things (including inherent accuracy) being the same, who wouldn't rather have the quick follow-up shots and positional stability offered by a semi-automatic rather than a clunky bolt-action? Seriously....
Our current generation of snipers quite dislike the Timberwolf and readily admit that it was a huge mistake to purchase what amounts to a custom precision rifle where a field-serviceable sniper rifle such as the Accuracy International was available instead. It was a poorly-written Statement Of Requirements with over-emphasis on accuracy above all-else and a hefty favouratism towards the home-team that got the CAF sniper community saddled with the Timberwolf. I have spoken with a healthy cross-section of current-serving snipers from the 1st and 3rd Battalions of the PPCLI over the past 2 years and all have nothing much positive to say about the Timberwolf aside from its accuracy when initially factory-tuned.
Not sure where some of you guys are getting your info, but my understanding is that the C20 is intended for exclusive sniper use, and will NOT be fielded as a DMR or "Sharpshooter" rifle. That said, the contract does seem to acquire enough C20s to distribute down to the Section level within the Reg F Canadian infantry, so I suppose the truth may lie somewhere in the middle. Perhaps they will actually deploy DMRs at the Platoon or Section level within the Canadian infantry at long last. It is an idea who time has certainly come were it not for inadequate funding typically dictating Canadian Army doctrine....
Oh, BTW - my "C20" cost me ~$2500 CAD NIB retail, so nothing close to the $24K "government" cost of the C20. Perhaps I should be doing CAF procurement! Anyhow, here's a photo - note the offset Front Take-Down Pin which is required to accomodate the Magazine-Well Sleeve that down-sizes the magazine well to 5.56mm dimensions, allowing a 5.56mm Upper to be run on the otherwise .308 Lower Receiver. Quite an ingenious and elegant solution to making the LE901/C20 Lower Receiver switch-caliber.