i've been seeing how your .22-250 is going. seems you are doing alright with that one. good for you.
with a superlite barrel i'd stick to lightweight bullets. that's because i'd expect less 'barrel whip' to be developed by the lighter bullets and because of what 'boots' obermeyer says about heavier bullets and heavier charges of slower powders causing barrel erosion. the .243 is so overbore that i'd definitely follow his advice. last summer my buddy's .243 in Model 700 BDL (blued) heated up so quickly from three shots with 100 gr' Sierra's that the barrel was too hot to touch!
i'd stick with 85 gr' bullets and lighter for everything out of the .243 through large whitetail/mule deer and caribou. i'd use Rem' brass which usually is heavier, and i'd use one of your 4895 propellants with a CCI-200 (standard, large rifle primer) behind that bullet. cci-200's should be good with any single-based, stick powder up through a 'speed' of approx' IMR's 4320.
let us know how you do,
ss'