Quick Answer
To reload .300 WSM cartridges, follow established safety protocols and use a suitable reloading manual, such as the Hodgdon or Lyman guides. Ensure proper case preparation, seating die alignment, and bullet seating depth. Use a scale accurate to 0.1 grains and a reliable powder measure.
Choosing the Right Powder
When reloading .300 WSM cartridges, select a suitable powder based on the Hodgdon data for 120-grain bullets. For instance, use IMR 4831 or H1000 for slower-burning powders, or Varget for a mid-burning option. Use a minimum of 64 grains of IMR 4831 for a 120-grain bullet, and a maximum of 74 grains for optimal performance.
Bullet Seating and Case Preparation
Properly prepare .300 WSM cases by deburring and chamfering the flash holes and primer pockets. Use a case trimming die to maintain a consistent 2.100-inch length, ensuring proper headspace. For bullet seating, use a dedicated .300 WSM seating die and keep the bullet seated at 2.850 inches deep, with a minimum of 0.050 inches clearance from the rifling.
Measuring and Loading Accuracy
When reloading .300 WSM cartridges for mule deer hunting, prioritize accuracy and consistency. Use a scale accurate to 0.1 grains to measure the powder charge, and a reliable powder measure to minimize variance. Load a minimum of 10 cartridges to develop a reliable average velocity, and use a chronograph to measure the average velocity of the loaded cartridges.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.