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Lyman™ 457671 Single Cavity Mold 45 Caliber Round Nose Gas Check 458-459 Diameter 475 Grain

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Quick Overview

Lyman™ 457671 Single Cavity Mold 45 Caliber 475 Grain are made from solid leaded-steel and machined to an exact and smooth super fine finish.

Availability: Backorderable



Lyman™ 457671 Single Cavity Mold 45 Caliber 475 Grains Round Nose Gas Check

Lyman™ 457671 Single Cavity Mold 45 Caliber Round Nose Gas Check 458-459 Diameter 475 Grain.  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 
  • Single Cavity Mold
  • Steel Sprue Plate 
  • Common Sizer Die Diameter: .458-459”
  • 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. Had very few bad bullets ... review by floyd on 6/12/2017

    Had very few bad bullets on start of casting.bullets poured out at .4595 with my alloy.(which is beween #2 and linotype).In my ruger # 1 I avg. 2.5 to 3 inch groups at 200 yds.I got my best groups with near max powder charges with every powder i tried in my ruger.The only thing i had trouble with was getting gas checks to stay on . I sized bullets down to .458. I had to have gas check groove polished out .002 more to fix the problem. great bullet for long range shooting

  2. Very pleased with the ... review by Joe on 6/12/2017

    Very pleased with the quality of this mold, I have used many of Lyman\'s molds over the years and this is just as good as my others, very happy and would recommend this brand.The mold takes a while to warm up as with all steel molds but once she\'s hot, casting is quick and the bullets drop on the first or second whack every time. The bullet itself I am happy with and suitable for long range, I am using this in my .458 win mag (Ruger No.1 rifle) and it shoots decent enough so far, haven\'t even worked up the best load for this yet. Recoil is substantially more than the 405gn lead or 300gn jacketed bullets as expected.

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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 -