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GEN II: LOT 24B AND ONWARDS

Thank you for your business and choosing the JB Reamer Stop from Bauduin Accuracy and Machine! Below are the instructions on using the reamer stop. This tool is designed to be used with reamers that have a 7/16” (0.4375) shank and has been checked to work with reamers from .17 Remington up to .338 Lapua. If you have any issues, questions, or suggestions, please see my contact information at the end of the instructions. Please see the images below for visual examples and the parts diagram of the JB Reamer Stop. Thank you!

CLEANING

The reamer stop will come with a small amount of anti-seize applied to the threads. This prevents galling and ensures smooth operation. There is no need to disassemble the reamer stop when it’s new. After use, clean all parts to remove any chips, cutting oil, and debris from the threads. Use brake cleaner, mineral spirits, alcohol, or an equivalent. Reapply a small amount of anti-seize to the threads before reassembling. If desired, a thin coat of oil can be applied to the outside, though all parts are stainless steel and corrosion-resistant. If you do not plan to remove the reamer stop, you can leave it locked on the reamer shank to maintain the desired headspace.

HOW TO USE

REAMER STOPS FROM LOT 24B onwards have two body lengths: short and long. Start with the short body and follow the instructions below. If there’s not enough adjustment, switch to the long body and repeat the instructions.

REAMER STOPS FROM 24B onwards do not have a locking set screw in the adjustment sleeve.

1. Insert your chosen chambering reamer into the reamer stop from the front. Slide the reamer all the way into the counterbore of the reamer stop body until it stops against the shoulder at the rear. For smaller reamers (e.g., .223 Rem), slide through the body until the fluted part appears, then lock the set screw with the provided Allen wrench to approximately 20 inch-lbs.
2. For actions with recessed bolt nose (Remington style) or cone bolt: Set the shoulder of the GO headspace gauge (or the top of the belt for belted gauges) roughly .050 above the shoulder/belt of the chamber reamer. See Figures I, II, and III.
3. For actions with a flat bolt nose (e.g., BAT Vampire, BAT HR, KELBLY ATLAS): Measure the bolt face depth and add .050. Mark this measurement on the GO gauge and align it with the shoulder or belt on a belted reamer. See Figures V and VI.
4. Thread the Adjustment Sleeve forward until the GO gauge rests on its face in the correct location. If there isn’t enough room, loosen the set screw and slide the reamer out slightly or switch to the long reamer stop body.
5. After setting the Adjustment Sleeve, run the Lock Nut up to the Adjustment Sleeve until it stops. Adjust further until the reference line on the reamer stop body aligns with a whole number on the Lock Nut. Each mark on the Lock Nut represents .001, with .025 per revolution.
6. Insert the chamber reamer into your reamer holder and begin the finish chambering process.
7. When nearing contact with the barrel, clear chips from the reamer stop and barrel face using compressed air or a clean rag. Ensure the tenon face is burr-free. Make light contact with the tailstock.
8. Check headspace. Adjust the Lock Nut and Adjustment Sleeve as needed. Secure the Lock Nut in place and verify settings.
9. Once headspace is set, the JB Reamer Stop can remain locked in position for consistent results in future chambers. This design has repeatedly held headspace within +/- .001 across multiple .223 Rem barrels, making it ideal for production runs.

CONTACT INFORMATION

Bauduin Accuracy and Machine LLC
Jerry Bauduin
Phone: 304-914-6444
Email: jerry6br@gmail.com
Forum: Accurate Shooter Forum