I guess the question boils down to, what is entailed in switching caseheads in the Remington 700 series rifles? First let me say I totally understand the why of your actions but would have proceded in a different way. I would have bought a 30-06(probably a used rifle) and rebarreled, and restocked. Changing the caliber from a magnum bolt face to a standard bolt face(30-06, 280, 270, 308,etc.) requires a bolt swap. Considering your going to have to rebarrel anyway the only gain is not having to restock. even that has some drawbacks. The Magnum rifles generally carry a heavier barrel profile than the standard calibers, which means you 280 will end up heavier than need be. Also a magazine box/follower change will be needed. The 700's use the mag box to control cartridge feeding rather than feed rails as in the mauser. There are drawbacks to that but there are advantages. It makes caliber conversions much easier than the mauser, in some cases such as here converting a magnum mauser back to a standard case would be very difficult indeed. The other question you asked was which is easier(cheaper, 'better') to open a bolt face or swap bolts. Without any doubt a bolt swap would be both easier and cheaper, if a bolt can be found. The reason is simply put the extractor. Usually opening a boltface on the 700 entails an extractor swap. I am sure there are those who can recut the recess for a new remington extractor but I know of no one. The usual procedure is to use an M16 or Sako extractor. This modification is safe if done correctly but adds consederably to the espense of the conversion and negates the '3 rings of steel' concept of the remington action. I guess the short answer is use a 30-06, rebarrel, and restock. It's cheaper, and probably safer than the path you've chosen. But a Mag, re-barrel, and swap/Modify the bolt. Best answer of all? Buy a stainless M70 in 280, restock and open the chamber. You get the SS, a great extractor(at least the design), and the only expnse is opening the chamber and restock. You even get to pick the camo color of your choice!!! I am kinds partial to the ACCRABOND stocks. The stability of a laminate that looks more like fine walnut...
Just remember there are only 2 action lengths in the M700 long and short(not counting the super shorts). The rest is covered buy magbox changes and bolt face differences. Stock changes are generally cheaper than rebarrels(not counting fancy walnut) and altering the safety features on ANY weapon will give a gunsmith the willys...and his insurance man high blood pressure. Sorry for the length of the reply,,hope I answered your question...it was a very interesting one..thanks!! Jerry
PS--I went to Remington Country and looked at the LSS. Just buy the rifle in 7mmRemMag. There is little difference in performance and ammo is nearly a universal thing in gunshops.