While we are on "barrel life", I would like to share some other personal experiences with this subject. The 220 Swift has long been accused of being very
tough on barrels. I bought a brand new Ruger M77V [tang safety] in 1980. It turned out to be one of those rifles we all wish for. It would shoot the 52
grain Sierra in ¼ moa consistently. 39.5 grains of IMR 4064 gave that bullet 4040 fps average, so no slouch. I also shot the 55 grain Sierra with 39 grains of
H380, for 3900 and pennies.
This rifle won many turkeys at our local club, not only in my hands, but with others shooting it. I noticed a slight accuracy degrading at 2950 rounds, but still
it would stay at ½ moa with the bullet seated out a bit. It accounted for literally hundreds of crows and magpies, some as far out as 400 yards. I took it out
to Eckville, Alberta to a friends farm and shot gophers for 3 days.
Finally had to rebarrel at close to 3700 rounds, as I could no longer maintain moa. Again, avoiding shooting until the barrel was hot and good maintenance I believe
was the key to good barrel life in this rifle. [keep in mind, this had a C-M barrel, not SS]
Finally, my 6.5x55 experience: I have a 700 Classic so chambered. It is now on its 3rd barrel, but the history is somewhat spotted. The original Remington barrel was
a bit fussy, but shot the 129 and 140 Hornady well, and also the 125/140 Partitions. It took me just over 4500 rounds to wash out that tube to the point that I could
no longer trust it to stay under 1½ moa.
I rebarrelled with a 5-groove Pac-Nor SS tube. It shot everything very well, but I was a bit surprised when accuracy started to degrade at less than 3500 rounds. About then
I had access to a bore scope, so took a look. I was taken aback to see no rifling for 5" up from the throat. Have no idea why this one went south so soon. This rifle now wears
a Match grade Shilen, and shoots "lights out" It has only 350 rounds through it, so a ways to go, I'm sure.
One more I managed to wash out the throat in was an early Remington 700 chambered in 264 Win Mag [24" factory SS barrel in those] 140 Partitions at 3175 fps was the only
bullet/load I hunted with, but practiced with the 140 Speer FBSP. This rifle was very accurate with a stiff load of H5010 behind those 140s. Accuracy degradation became evident at just over 2600 rounds, and went south rather quickly. I just went ahead and screwed on a 26" SS Hart, which shot incredibly well. This rifle has gone to a new home.

Dave.