you're not wierd, i kinda wana rebarrel my 243 to 6-284 in the future, not sure about barrel life tho, i like a barrel that will last since i've shot about 700 through my 243 this year......
Got a 6-284 but it is an 8 twist and prefers a stiff load of R22 behind a 105 Berger. Therse things are notorious barrel burners so I use mine spairingly on prairie dogs beyond 500 yards. The 55s in the 243 work great to 500