https://bulletin.accurateshooter.com/2020/04/tech-tip-lapping-the-inside-of-seating-stems/ from AccurateShooter.com Sun, 07 Jun 2026 10:05:48 +0000 hourly 1 https://wordpress.org/?v=4.1.26 https://bulletin.accurateshooter.com/2020/04/tech-tip-lapping-the-inside-of-seating-stems/comment-page-1/#comment-61099 Tue, 08 Aug 2023 15:35:47 +0000 http://bulletin.accurateshooter.com/?p=64101#comment-61099 I used the Wilson die body to stabilize the bullet in a dummy round. I partially seated my bullet leaving some extra stem above the micrometer so that it would turn freely and exert downward force on the bullet ogive. I put some diamond lapping paste inside the stem mouth and a drop of oil on the outside of the stem, then slid it down over the dummy round. The top of the Wilson stem is cut for a flat-head screwdriver. I chucked a long flat-head bit into my hand drill and turned the stem as I kept finger pressure on the base of the trapped dummy round. After 2-3 minutes of honing in this manner the bullet showed a full 1/16″ wide contact patch with the stem interior.

]]> https://bulletin.accurateshooter.com/2020/04/tech-tip-lapping-the-inside-of-seating-stems/comment-page-1/#comment-58276 Tue, 14 Apr 2020 17:18:13 +0000 http://bulletin.accurateshooter.com/?p=64101#comment-58276 This is a better way to destroy the seating stem than improve it. Rotating a bullet against a non-rotating, hand-held stem is likely to create a cavity misaligned with the axis of the stem. Please, hold the bullet and rotate the stem.

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