I've used Sierra 168 grain Match King projectiles in most of my Krag rifles and carbines, because, I bought a stockpile of these bullets, years ago.

They have performed well for me at 50 and 100 yards. The reloads have fed well in most of my Krags.

This is likely not the optimum projectile for the Krag barrel's long 'lead'.
I believe a lot of KCA members, who have put more time into load development, prefer Round Nose - Flat Base projectiles.

I use them because I have them. They make pretty reloads!

BTW - I didn't know Sierra was now producing a 175 grain .30 cal. Match King.

---