The bullet does the killing. Pick the ammo with the bullet you want first.

As far as I know Norma and Hornaday "Superperformance" ammo has greater velocity ammo than any other other ammo sold here.

I don't know about the Hornaday SP bullet performance. Norma ammo using 140 Nosler Partition bullets which are outstanding. But Norma is pricey.

heres a link for purchasing online:

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=304242496n