If you have to ask, you probably can't afford it - is my motto..
If you are questioning his ability or credentials and don't like his price, then you probably should look elsewhere.
If I was going to ruin a new rifle, I wouldn't want to take it to the cheapest person available, I would want to take it to the most qualified.
Its ballistics and velocity compares to a 30-06 in a smaller case, but if you want velocity in a 30-06, you don't shoot a 180 gr bullet!
You just can't walk into a Walmart the night before deer season and pick up a couple of boxes of shells. If you go to camp and forget your shells you are screwed..
Here is what Chuck Hawks had to say about it.
This case has the considerable advantage of having been designed to work in short action rifles. Its disadvantage is that the .308 case has a shorter neck than the 7x57 and to function in short action rifles the relatively long .338 bullets must be seated pretty deep in the case.
The price to be paid for higher performance is, of course, increased recoil. I am convinced that heavy recoil, more than any other factor, is what has limited the popularity of all the previous standard medium bore cartridges, including the .33 Winchester, .348 Winchester, .35 Winchester, .356 Winchester, .358 Winchester, and .35 Whelen.
Despite all of the discussion about long range shooting and long range rifles, the reality is that most deer are killed at less than 100 yards in North America. A brush bucking .338 cartridge is superior for woods and brush country deer hunting to a high velocity small bore.