Here is a full out 6mm PPC benchrest gun. Boy this thing shoots! Unlike the other guns, it just about doesn't care what sort of ammo is put into it – they all go into the same hole no matter what. I have a target with a 3/8 inch hole in it from 20 shots of 4 different loads and two shooters. That's pretty good. Almost ruined it for me, as I like load development, and with this, there's basically no point. Well, it does show a slight preference for match grade 70 gr Sierra bullets and powder that burns at about the right speed, which could be any of H322, W748, N200 or N201. The trigger on this gun is the lightest I have ever experienced. It is too light for me to measure, or even feel. It takes a bit of special technique to shoot this gun.
I have a similar gun but it is a real sleeper as well. It is a 244 Remington (note i didn't not say 6mm) built on a Remington 788, not my choice of action. I picked this gun up from a guy in PA that thought he had shot it out as well, he was also afraid of the gun because he tried to work on the trigger and one time he took it off safe and it discharged. A good cleaning and a rebedding of the action was all it took. It has a 26 inch CJ Hart SS heavy barrel with a 1 in 12 twist and a Canjar set trigger. I disassembled the trigger and remade a couple of the parts he had screwed up and the safety now works as designed (BTW I hate guys with dremel tools). It has a 6X18 Redfield scope of 1980's vintage on it, optics are great.
It likes 75 gr Hornady bullets the best ( I bought a lifetime supply 20 years ago from a guy going out of business) with IMR 4350, I can't quite fill the case with that as it will over pressure as denoted by stiff retraction and flowed brass into the bolt face. You can also tell when you go to reload them they take more than a touch up on the length trimmer. Move up to IMR 4831 and it can't quite get to the optimal pressure. I have a quality set of neck sizing dies and a old A2 heavy RCBS press which will repeat like mad. The press is another story how I laid my hands on that. I have seen the Wilson trimmer barely kiss the case with the best of the loads. The CJ Hart barrel is reamed slightly deep on the neck area and you can hang the bullets out some, just so they kiss the lands of the rifling.
What I like about the gun is it looks ugly, and it gets laughed at the range. They mock the action, the stock is beat 6 ways to Sunday, it too has the mounts for a sling, but I do use it for antelope and bring a bipod out and attach it for those days. They get pretty quite when I shoot the C out of a Coke can at 300 yards (OK it has to be a really cool morning with very low wind). It is funny as the can never moves and they think it is a miss, spotting scope and the can itself always says different. The antelope hate it even at 600+ yards. I used to go prairie dogging with it but those little buggers are getting pretty scarce, and since I moved to AZ I have not seen one town.
BTW I have about 15 boxes of original Remington 244 ammo in the old green boxes I got on 1/2 price clearance as people would not buy them cause they didn't say 6mm.
Edit: OMG I just went surfing around the net and that old ammo is worth $75 a box, quite a nice investment from the $3 I paid. Glad I didn't shoot but a couple rounds.