Guys,
I'll be going on a plains game hunt in RSA, and I'm planning on taking two rifles. At the top of my list, game wise, are Kudu and Eland. For those, I'm bringing a Win M70 in 375. Also at the top of my list for smaller species is impala, and the outfitter I've been talking to said he can off "bonus" hunts for caracal and jackels. I have the opportunity to buy a nice CZ in 7x57 for a good price. Would this be a good choice as a second rifle? Originally, I was planning on bringing a 30-06 for the smaller game, but the 7x57 is being offered at a great price. For those with experience, let me know what you think! The ballistics of the 7x57one appear to be.....lacking.
Like others have posted, your .375 will easily kill all of the animals that you mentioned. Your .30-06 will also easily kill all of the animals that you mentioned. With proper bullets, proper bullet placement, and holding your shots to within a sensible range, a 7x57 will also kill all of the animals that you mentioned.
It sounds like you really want the 7x57, so go for it.
Unlike some other African countries, South Africa does not charge hunters to bring guns into their country, so you only have to contend with the extra weight and extra ammunition of two rifles. The paperwork for one or two rifles is basically the same, and the SAPS officer will only have to check an extra serial number if you bring two rifles.
In 2005 I brought two rifles on a hunt in Zimbabwe and South Africa, a .375 RUM and a 7 mm Rem mag. The .375 RUM was for Buffalo, and I also used it on a few other animals, but the 7 mm would have worked fine for everything except the buffalo. In 2007 I decided to simplify things and only brought the .375 RUM for a plains game hunt in the Eastern and Souther Cape of South Africa. The .375 RUM worked fine for 13 animals varying from Steenbok and Jackal to Kudu and Eland, including several 300 yd plus shots on such animals as Vaal Rhebok, Bontebok, and Gemsbok. Looking back, I think the 7 mm Rem mag would have also worked fine for all of the animals that I shot on that trip.
This year, I again kept it simple and only took one rifle, my .300 Weatherby, on another South African hunt. I really like that rifle, and I hope it will go with me on many future hunts.