The 168gr, 155gr Palma, and 175gr MatchKings are all exceptional bullets in .30 cal rifles. In my estimation, each one is just a little bit better in certain circumstances. In my case, I (and many thousands of other High Power shooters) use the 168gr MK over the course because it gives the best balance of accuracy, wind tolerance, and manageable recoil for the 200, 300, and 600 yard portions of the course-of-fire. Yes, there are those who have used the 155 Palma for the off-hand and sitting rapid-fire 200 yard phase, and then switch to the 168gr for the rest of the course (and every variation of the same, for many different reason, real or imagined). But, eventually, most decide to eliminate the confusion and stick to one load for the whole match. That is where the 168gr bullet shines. Remember: In the 300-yard phase, each shooter has exactly 1-minute to put ten shots on target... and that includes one reload. "Doping the wind" is quite out of the question.
Then F-class came along. This is where the 175gr really comes into it's own. There are also many who like the 155 and 168, but if you are building an F-class gun (which most do because the "over the course gun" is at a severe disadvantage to the purpose-built F-class guns), they are choosing twist rates, throats, and loaded-round LOA's that maximize the accuracy of the 175gr bullet in this specialized single-shot prone rifle.
Personally, I use all three bullets. I have an old .30-06 Winchester Model 70 Palma match rifle that purely loves the 155gr MK. And given the right conditions, on the right day, it has the potential to win matches. However, on a windy "Bodines kind of day", I would much prefer shooting 175 MK or 190 MK bullets out of my .30-338. And, when the notion hits me, I'll try to relive some of the glory-days of 600-yard slow fire prone with a friend's old Match Rifle (not in competition, because I NEED a scope). The 168gr still seems to be my best choice for this.
So, in short, I would suggest that you buy a 100-box of all three and do some concerted research into the accuracy performance with your particular gun/sport combination. One of these three bullets should work quite nicely.
BTW: There are some who will get all cranky if I mention this, but the 175gr MK does not shoot worth a hoot in my old Winchester Palma rifle. I am convinced that the 1-12" twist (at a leisurely 2700 fps) is insufficient to stabilize this bullet. The 155 Palma, however, was made for this gun. The same people doing the grouching are shooting the 175gr bullet out of a 300 Win Mag at 3100 fps. Comparing the stability to that of a 30-06, at 400 fps less, is missing the point entirely.
