If it is only an inch, I would go on & build the rifle & not worry about it. An inch warp is not uncommon & will usually work out as you build the rifle & thin the wood down at the forestock.
Oct/Round cam be a lil more of an issue, as sometimes they want to twist at the muzzle, as there are no flats to retain the stock straight. In this instance, you can get the underlugs on, accraglass them & thus the glass bedded underlug will hold the stock true to the muzzle.
But anyway, if thus warp is really bothering you, since it is a straight barrel, that means the barrel will normally lay in the channel. If this is true, you could take some wet rags & lay in the barrel channel for 3-4 hours, then take them out, oil the barrel & put the barrel in the channel, (or lay a piece of wax paper or shrink wrap between the barrel & damp stock) take about 10' of surgical tubing & start at the breech & strap the barrel in as tight as you can, go all the way down to the muzzle & back, forcing the barrel into the channel & wrap back to the muzzle. Stand the rifle almost vertical in the corner & forget it for a month. After a month take it out & check it.
Keith Lisle