Quick Answer
To reload .280 AI ammo effectively, use a high-quality die set, precise powder measurement, and consistent case preparation, paying close attention to case length and primer pocket depth. Utilize a reliable scale and ensure proper seating of the bullet. Regularly inspect and maintain your equipment for optimal results.
Case Preparation and Measurement
When preparing .280 AI cases, ensure the length is trimmed to 1.920 inches to prevent over-length issues in the chamber. Use a precision caliper to verify case length and a case trimmer to maintain consistent dimensions. A case length of 1.920 inches allows for adequate room for the bullet to seat properly and provides a safe margin for chambering.
Reloading Die Setup and Use
To reload .280 AI, use a high-quality die set that includes a full-length sizing die and a seating die. Set the die to the recommended .050-inch oversize for initial full-length sizing to compensate for case neck stretch. When seating the bullet, use a Lyman 55 or Hornady Lock-N-Load seating die, and seat the bullet at 2.500 inches to 2.550 inches from the base of the case, depending on the bullet type and desired pressure level.
Powder Measurement and Safety
For .280 AI reloading, use a high-accuracy digital scale, such as the RCBS 1501, to measure precise powder charges. A 50-grain charge of IMR 4350 or H4350 is a good starting point, but adjust the charge according to the specific powder and bullet combination being used. Always follow the manufacturer’s recommended charge ranges and ensure the charge is consistently measured to prevent overloading the case.
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