I've still got a partial box of Nosler J-4s that I've had for some time now. I found they shot well, so if you can get them cheaper than MKs they might be the bullets to use. I stopped using them, not because they didn't shoot, but because I developed a preference for bullets heavier than .308/168. Before you purchase the box of 250, perhaps buy a box of 100 first and see if they are right for your rifle. If the newer Custom Competition shoot as well for you as the older J-4s did for me, I'm sure you'll be happy with them
MKs popularity has been won over many years of customer satisfaction. Seldom do you have to worry if one lot is significantly different than another. Different rifles prefer different bullets though, and I had several that shot the Hornady .308/168 gr International Match better than anything else, and I used them almost exclusively until they dropped that bullet in favor of the polymer tipped bullet. MKs are available in a wider variety of bullet weights and calibers than match bullets from the other big name makers.