When I went last summer with the bow, we were treated just like the gun hunters right up until we found the right porter and greased his hand with a $10 bill. I know technically I did not have to do this, and should have been able to bypass all the same security as the gun hunters, but there were 5 porters that came over to the baggage carousel and grabbed anything that looked like a gun and put it on a cart.
We then had to follow them to a separate room where we had to sign a registry of importation of firearms - or something like that. After this the porters were then taking guys to the police station with their fire arms. When I came out of the room, my buddy was standing next to two porters, one with a big smile and another with his hand out. From the look on my buddies face I could see what was going on. To me it was a small price to pay to avoid the hassle they were trying to put us through. Once I greased his palm, we were "free to go" as they put it.
I suspect since you are bringing rifles too that you will have to go through the entire process anyway. Don't know if this helps, but it was my experience.
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