Prc if factory ammo is a concern, saum if you want a little more performance. I’m in the same boat but I keep thinking 6.5 wsm running a 140 accubond would be very hard to beat. Best wishes on your decision
You probably won't find many who own both. They are pretty similar, I have a 6.5 saum.
Saum will outrun the prc by little bit. I would say pick which one you can get components for first, but since you have both, I don't really know how you make your choice. I'd still go saum, buy I'm biased.
The PRC is ascending which means it is more 'future-proof' from a component standpoint. Other than that, pick the one that pulls at your heart more. Flip a coin. PRC is heads, SAUM is tails. Before looking at the coin, ask yourself which you hope it will be. That's your answer. No need to look @ coin after all.
I have a saum and my buddy has a prc. We both use the same set up for deer, h1000 and 143 eldx. Mine is at 3050 fps and his is 3030 fps but his is almost max load while I ran up to 3200 before pressure signs. With ADG offering brass now for the saum, I would say component wise they are equal. I would go with saum if you want more speed, PRC if factory ammo has any interest in you.
6.5 PRC and don't look back, I was in the same boat right when the 6.5 PRC came out. I have built five different 6.5 PRC rifles, they are stupid easy to load for and the factory ammo shoots lights out also even though a bit slower than handloads.
With that said my next 6.5 build will be a 6.5 Max