I own a Sendero in 7mm RUM and a 700P in 338 Lapua Mag. If I had to choose between the two models I'd go with the 700P. The 338 cost me quite a bit more than the Sendero but I think it's worth the money. Let me explain why. I really like the Sendero/VSSF platform and own several but the 7RUM just was not as accurate as it should have been.I think the problem was in the large amount of free bore Remington puts in the RUM guns (.40"). It's back at the Remington factory right now looking for a cure. The Sendero action is a regular production run item. The Remington Rep said that because the 700P is considered a Police weapon it was held to a tighter tolerance because they guarantee a certain degree of accuracy for these guns. He would not say that the action was blueprinted but he did say that the action and barrel were squared. The 700P shoots less than half inch groups and the Sendero won't shoot less than 1 1/2". The 700P has a detachable box magazine, which I like. It also has a muzzle brake which really helps with the 338. LM. I wish the 7 RUM had one. It kicks twice as bad. I do wish the 700P had a full 26" barrel not counting the muzzle brake. The 700P has the great 40X trigger while the Sendero has the Xmark trigger. The Mark is Okay but it's not a wrong.
Now that's just my opinion, and I could be wrong.