I have a 6-284 that I have always shot moly coated bullets out of and now I want to change back to non moly. I thought I had it pretty clean but when I shot the same load of 54 h1000 107's they would only shoot 1" instead of the 3/8" they usually do. I'm thinking that I still don't have all the old moly out yet, what are you guys thoughts?

shoot cleen repeat!

I would suspect the powder charge should be adjusted upwards slightly to compensate for the reduced pressure provided by the slippery coating that used to be on the bullet and bore.
With coating on the bullet and bore gone, you are no longer operating at the same pressure, I bet the velocity of this load does not chrono the same as before. Get the velocity back to where it was before and it will probably tighten the group back up.

The more I shot this load with moly the higher the pressure seemed to get. I ended up dropping down to 52. I'm still going to crony it this weekend hopfully if the weather holds out.

I`d ask about cleaning over on benchrest.com those boys have years of experiance with that stuff. My take on moly is it builds up in the first couple inches of the bore and you need something like JB or Rem Clean to get it out. I never have used moly though, so this is just hearsay.

Actually, with the moly reducing pressures somewhat, I would LOWER the powder charge a bit when using non-moly's bullets to see if accuracy comes back.
Old Joe is right on the build-up of moly. Brush and JB will help remove this.

Had similar problems with moly, so I no longer use it. Still have about 40 or so moly VMAX .223's in a case somewhere.

Thanks for the input, I have 20 or so more moly rounds then I'm done shooting in this gun. I sure hope that it comes around to shooting better.