I can't say enough about my .375Wby but even more than that is the accuracy performance of the 300gr TSX in front of 93grs of H4831sc with Weatherby brass and CCI 250 primers. I have shot over the last year seven rifles with freebore and five were Mark V's and every on of them after I found my load were 7/8" for one and 1/2" for the other six rifles. Cartridges were 257Wby, 257-300Wby, 300Wby, 300Wby, 300Wby, 416Wby and 375Wby. In all of these rifles I obtained accuracy with the following TSX's. 100gr for 257's, 180gr for 300's, 350gr for 416, and 300 for 375. There is no better production hunting rifle on the market in my opinion (I did say my opinion which is biased) and most customs have trouble keeping up with the Weatherby Mark V. If you are a shooter at all you will have the above results to some degree and if you shoot Custom Mark V's there will be no doubt what the results will be. Weatherby's can get a bad rap like a lot of other rifles do at times and this is due to the shooter and the handloader and of course they blame it on the rifle. None of my Weahterby's or the Vanguard have failed to shoot under an inch on a consistent bases when I finished my load work. Case in point: Mickey who shoots a Weatherby he bought and is a friend who hunts with me in Arizona could not get his Weatherby to shoot under and inch. It was not the rifle or the load, it was Mickey. One day at the range in his frustration he said, "You shoot it, go a head and you will see that I don't have a good Weatherby, it will not shoot." So I did, wondering what was wrong with the rifle or load, that he could only get 1 1/2" at best at 100yds from the bench. When I shot the first group it measured .624" and the third and fourth groups shot .467 and .532" and the last group I fired shot .375". All this said, Weatherby's will shoot just pain and simple. Of course before anyone has a heart attack, there are and have been some real rifle issues in the past at times with the Mark V but that surely has been solved. I think shooters and hand loaders ought to realize that most of the time it is them and not the rifle.