Just FYI, I have a model 7 which was a 243, and a 700 ADL which was a 243.
I bought a barrel vise, action wrench, and head space gauges from Midway and a 7-08 barrel from a Rem 700 on the 'Fire classifieds.
The 18 inch 243 barrel came off the model 7. The 24 inch 243 barrel which had been rechambered to 6mm-284 came off the 700 ADL and went on the 7. Then the 7-08 barrel went onto the 700 ADL which got a Walnut BDL stock and bottom metal.
Headspace came out exactly right on both rifles when finished. Though I did have to relieve the barrel channel a bit on the model 7 for the heavier barrel.
If I can do it, anybody can.
Heck, if nobody else wants that new barrel from dennisinaz, I would buy it just for a spare, to swap out with the 6mm-284 because I know that throat will not last long.