Everything at the workbench — stock or chassis, action-screw torque, bed or pillar — exists to do one thing: make the barreled action return to exactly the same place every time, so the barrel does the same dance on every shot. That is accuracy.
Stock vs. chassis
Both hold the barreled action in a fixed, repeatable position and give you a stable interface. A stock is a one-piece body — wood, laminate, fiberglass, or carbon — molded or machined to accept the action. A chassis is a CNC-machined aluminum skeleton the action bolts into via a V-block or recoil-lug interface, usually more adjustable and modular. For someone learning the game, the factory stock is almost always good enough — spend the chassis money on glass and ammo testing first. If you want maximum adjustability and a future-proof platform, a chassis is the better long-term buy.
Action-screw torque: the setting most people get wrong
Action-screw torque is the clamping force holding the barreled action into the stock or chassis. Too loose and the action shifts under recoil — groups open, zero drifts, fliers all day. Too tight and you distort the receiver and can pinch the bolt into rough cycling. The CZ 457 is the poster child here: its receiver is thin enough that excess clamping force flexes it, and most shooters find their best groups somewhere between 15 and 35 inch-pounds — some as low as 12, some happiest near 35.
How to run a torque test
Get a real inch-pound wrench (the Wheeler FAT wrench is the budget standard). Pick three or four values that bracket your guess — for a CZ 457 maybe 15/22/28/35, for a Tikka 25/35/45/55. Shoot three five-shot groups at each, then take the value with the smallest average group, not the smallest single group. Write it down — tape the torque value, screw order, and ammo lot inside your case, and re-check every few hundred rounds.
Bedding and pillars
Both solve the same problem: the action must return to the same position every time the screws are torqued. Pillars are short metal cylinders bedded where the action screws pass through the stock; they stop the stock from compressing at the screw holes. Bedding is a two-part epoxy (Devcon, Marine-Tex, Acraglas, Pro-Bed) poured to fill voids and give the action full, even contact. Together they lock the action into one repeatable position. A proper bed-and-pillar job on a previously unbedded factory stock often tightens groups 20–40% — the rifle didn't get better, it just stopped randomizing its own answer.
Bottom line
None of this is exotic; all of it is repeatable. The shooter who tunes the rifle once and then spends the next thousand rounds learning the wind will beat the one who buys a new stock every six months.
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