457 troubleshooting decision tree
Safety: unload the rifle, remove the magazine and check the chamber before inspecting anything. After a misfire, keep the muzzle pointed safely downrange for at least 30 seconds before opening the action.
These are general rimfire diagnostic steps (conf: med). Rifle-specific claims with sources are on the linked pages.
Won't feed / nose-dives
- Is the magazine fully seated and clean? Try a second mag.
- Is the round seated in the mag with the rim at the back? .22 LR rims can stack (rimlock).
- Does it feed by hand with a different ammo brand? Some bullet shapes feed worse.
- Dirty or burred feed ramp/chamber mouth: clean it, then inspect.
Still stuck? See known 457 issues and the gunsmithing specs. Parts: magazines and more.
Won't extract
- Is the chamber fouled? Clean it with a chamber brush; dirty chambers grip cases.
- Is the extractor claw chipped, or is its spring weak? Inspect it with the bolt out.
- Is it only with one ammo lot? Tight-chamber rifles can stick on some brands.
Still stuck? See known 457 issues and the gunsmithing specs. Parts: bolt and more.
Weak or no ejection
- Work the bolt briskly. Rimfire bolt guns need a firm pull to eject.
- Is the ejector bent or gummed up?
- Does a clean extractor help? Ejection depends on the extractor holding the case.
Still stuck? See known 457 issues and the gunsmithing specs. Parts: bolt and more.
Light strikes / misfires
- Rotate the dud 90° and re-fire (wait 30+ s with the muzzle downrange first). If it fires, suspect ammo or rim priming.
- Many duds in one box: change ammo first.
- Duds across brands: the firing-pin channel is dirty, the spring is weak, or the firing pin is worn or chipped. Clean, then inspect.
- Was the trigger or bolt recently modified? Check the striker spring and cocking.
Still stuck? See known 457 issues and the gunsmithing specs. Parts: bolt and more.
Accuracy fell off
- Check action-screw torque and scope/rail/ring torque first. Most problems are here.
- Same ammo lot? Change one variable at a time; test at 50 yd.
- Is the bore over-cleaned or freshly cleaned? Fire fouling shots.
- Is the barrel or stock touching? Check free-float clearance and bedding.
- Is the crown damaged? Inspect the muzzle and thread protector seating.
Still stuck? See known 457 issues and the gunsmithing specs. Parts: accuracy and more.
Bolt is stiff, sticks or won't close
- Is there debris or dried lube on the bolt body or cocking cam? Clean and lightly lube.
- Is a case rim or brass shaving in the chamber or the bolt face?
- Is the scope or rail rubbing the bolt handle? Check clearance with the scope mounted.
- Is there an aftermarket handle or shroud? Recheck its installation.
Still stuck? See known 457 issues and the gunsmithing specs. Parts: bolt and more.
Fixes and parts
- Torque values and procedures: gunsmithing
- Cleaning schedule: maintenance
- Ammo that feeds and groups well: ammo guide
- Replacement magazines, bolt parts and triggers: parts finder
- Buying used? Use the inspection checklist.