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Lyman™ 257420 Double Cavity Bullet Mold 25 Caliber- 65 Grain 258 Diameter- Flat Nose Gas Check

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Quick Overview

Lyman™ 257420 Double Cavity Bullet Mold 25 Caliber- 65 Grain 258 Diameter- Flat Nose Gas Check are made from solid leaded-steel and machined to an exact and smooth super fine finish.

Availability: Backorderable



Lyman™ 257420 Double Cavity Bullet Mold 25 Caliber- 65 Grain 258 Diameter- Flat Nose Gas Check

Lyman™ 257420 Double Cavity Bullet Mold 25 Caliber- 65 Grain 258 Diameter- Flat Nose Gas Check. The mold is made from solid leaded-steel and machined to an exacting, super smooth finish. All Lyman™ molds are heat treated which, causes the metal to appear blue in color. The mold features hardened steel alignment pins that provide you with years of bullet casting.

The mold's sprue plates are made from solid steel, which are ground flat and held tightly in place with tempered steel spring washers and screws. In addition, Lyman™ molds required break-in time is often half the time required for iron molds. Mold handles are not included.


  • Machined Leaded Steel Mold Blocks 
  • Double Cavity Mold
  • Steel Sprue Plate 
  • Common Sizer Die Diameter: .258”
  • Hardwood Handles are not included and must be purchased separately.
  • Weights provided are Lyman's weights with suggested allow; actual weight may vary due to alloy mixture used.

  1. I have found this to be a ... review by Dom on 6/12/2017

    I have found this to be a very accurate bullet. Cast from wheel weights it weighs in at 73 grains after lubing & adding a gas check. I drive it at 1500FPS out of my Marlin 94CL. Note: Unsalted lard or fat from you last big game animal fluxes your lead alloy as good as the most expensive flux you can buy. I have found \"Lead Bullet Technology\" bullet lube to be the best bullet lube I have ever used. Great for high speed.

  2. Good small caliber mold review by Randy on 6/12/2017

    This mold casts a very uniform bullet provided it is properly preheated. It can be used with or without the gas check with about equal accuracy provided the usual velocity limits are observed.
    My only two objections are: 1. The size of the mold blocks...they are just massive which not only makes them heavy, it makes a good strong pre-heat an absolutely necessity unless you want to cast for an hour before getting a good bullet.
    2. The base is improperly tapered to receive a gas check. I have, as one writer noted above, used a slightly rounded punch to open the GC\'s up prior to use. Recently I used an ounce and a half goldsmith\'s hammer to seat them. This worked well and didn\'t deform the base. They group quite well at mid-range distances (25-50 yds) in My M25 Rem 25-20 and seem most accurate with either IMR 4198 or IMR 4227.

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Most items ship within 1 business day. We ship orders from our warehouse Monday through Friday. If an in-stock order is placed on Friday evening, Saturday or Sunday, it may not ship out until the following Monday. We rush-ship directly to customer's doors throughout the United States. Depending on the shipping method and area of the country, orders can arrive between 1 and 7 business days. 


Standard Ground FREE over $50 4-7 Business Days
Three-Day Variable Cost 3 Business Days
Two-Day Variable Cost 2 Business Days
Overnight Variable Cost 1 Business Day

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Priority Mail Variable Cost 2-3 Business Days


If you are not 100% satisfied with your order, you can return it to us for a refund or exchange within 30 days of delivery. We accept returns on all products that have not been used or registered, no questions asked. All returns are subject to a 5% Re-Stocking Fee. To make returning an item easy, contact our friendly customer service representatives toll free 1-855-297-7000.

warning-iconWARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to -