I have several "built" rifles. Some are not big changes, others are much greater.
1. Savage 10 action, Takeoff 40X Remington barrel, chambered in 225 Winchester. Timney, Varmint synthetic stock Guntech smithing
2. Remington 700 action, trued, Bob Jury 1-8 barrel chambered in 6mm Remington. Triggertech, bedded into a 700 Classic stock. Guntech smithing.
3. Remington 700 action, trued, Heavy Benchmark 1-8 barrel, chambered in 6mm Remington, Jewell trigger, bedded into a heavy laminate Stock. Leeper Smithing.
4. Remington 700 action, trued, Shilen 1-8 barrel, chambered in 6.5x55, bedded in 700 Classic stock, Triggertech trigger. Guntech smithing
5. Remington 721 Action, trued, Lothar-Walther 1-8 barrel, chambered in 6.5x55AI, bedded in a wider forend pepper laminate stock, Jewell trigger. Guntech smithing.
6. Weatherby Vanguard, factory barrel, 257 Weatherby Magnum, bedded into a Boyds Laminate stock. [not much custom here, lol]
7. Ruger #1B Factory 26" 1-10 barrel, rechambered to 308 Norma Magnum. Unknown smithing. [sub-moa rifle

]
8. Ross Mk 10 rifle, McGowen 1-10" barrel chambered 303 British. bedded in a Custom sporter stock. Complete re-blue. Jennings smithing.
9. Remington 700 Action, trued, McGowen 1-9.5 barrel, chambered in 8x57 JS, Bedded into early BDL stock. tuned Walker trigger. Gunsmith not known.
10 Reminton 700 Action, trued, McGowen 1-10 barrel, chambered in 308 Norma Magnum, Triggertech trigger, bedded into a Custom Shop Tiger maple stock. Leeper smithing.
11.Remington 700 Action, trued, Benchmark 1-10 barrel, chaambered in 8mm Remington Magnum, bedded into a McMillan synthetic. Triggertech trigger Guntech smithing.
12 Reminton 700 action, blueprinted, Remington stainless, chambered in 260 Remington with a .292 neck. Triggertech, Bedded into a BDL stock. smithed in USA.
Couple of others wearing replacement stocks, but inconsquential, IMHO. Dave.