most outfitters will be prepared to rent you s rifle, but don't expect anything of particularly good quality. We use a Blaser R93 & Swarovski scope for this, but most companies won't have a loaner rifle of such good quality.

You also have to consider what you're going to hunt in your trip. If it's plains game then the fact that you're unfamiliar with the rifle won't matter too much, but if you're planning to hunt Dangerous Game then it might not be such a good idea......another factor in your decision should be the quality of the PH. If he's good at what he does then you can place a great deal more reliance on him than if he's a young kid straight out of training.