The Forster 0.4025 inch Inside Neck Reamer (.40/10 mm (.400-.401)) (brand part no. NR1400) mounts in a Forster case trimmer in place of the pilot and removes excess brass from inside the case neck, sized to a 0.4025 inch diameter (.40/10 mm (.400-.401)). Forster Products grinds these reamers roughly 0.0025 to 0.003 inch larger than maximum bullet diameter, enough to relieve a thick or fouled neck without touching the outside. It follows the case’s existing neck hole, so it relieves thickness rather than correcting neck-wall uniformity.

Key Specifications

• Sized to a 0.4025 inch diameter (.40/10 mm (.400-.401)), ground roughly 0.0025 to 0.003 inch larger than maximum bullet diameter.
• Mounts in a Forster case trimmer’s cutter in place of the standard pilot.
• Removes excess brass from inside the case neck, relieving thickness that can raise chamber pressure.
• Follows the case’s existing neck hole rather than correcting neck-wall uniformity; outside neck turning is the tool for that instead.

Frequently Asked Questions

Does this reamer correct uneven neck wall thickness? No, it follows the case’s existing hole and relieves overall thickness; outside neck turning corrects wall-thickness variation instead.

What does this reamer mount in? A Forster case trimmer, in place of the standard pilot.

Buy the Forster 0.4025 inch Inside Neck Reamer (.40/10 mm (.400-.401))

Order the Forster 0.4025 inch Inside Neck Reamer (.40/10 mm (.400-.401)) from our Lubbock, Texas gun shop for fast shipping to your bench. See our case preparation tools for more neck-prep accessories.