On barrel wear...

General Firearms Precision Rifle - Bolt Gun
1

The following is quoted from the current edition of Remington’s “Liveready” magazine (essentially a Remington promo/publicity magazine), from an article on the M40A6:

“There are many variables to barrel life in a bolt-action .308 Winchester, but a conservative number of rounds any one barrel can support is probably right around 7,000 to 9,000. An average 6.5mm short action cartridge might get 3,000 rounds, and a 6mm might get as many as 2,000 rounds.”

Is this accurate? Are the smaller calibers really that hard on bores?

2

I don’t think it’s the caliber so much as it’s the amount of gas the cartridge produces.

3

This.

Plus, the more powder fired, the faster the erosion. The lead and rifling just in front of the chamber is what goes first.

4

The heat and pressure wears the throat faster. But that’s consistent if we’re talking similar parent case. So expect less life from a .243 compared to a .308, .25/06 < .30/06, 6mm Creedmoor < 6.5 Creedmoor.
Not necessarily a function of just the bore size, such as 6 Dasher is supposed to have a longer life than 6 CM.

It also depends on your definition of accuracy. The life for benchrest is different from PRS or hunters.

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5

I don’t think there is a “one size” fits all here. Just as some of the above posts point out, there are a number variables that affect barrel wear.