Quick Answer
Identify signs of pressure in 7mm SAUM loads by checking for consistent primer flow, even bullet seating, and proper case expansion, while ensuring proper powder charge, seating depth, and case gauge measurements are within recommended specifications.
Checking for Consistent Primer Flow
To identify signs of pressure in 7mm SAUM loads, inspect the primer flow. A uniform flow indicates a well-balanced load. Uneven or excessive primer flow can signal over-pressure. Check for consistent primer flow on all cartridges.
Measuring Case Expansion
Measure the case expansion by placing a calibrated case gauge over the shoulder of the case. A well-formed load will have a consistent expansion of 0.003 to 0.005 inches. Expansion outside this range can indicate over-pressure.
Load Verification Techniques
Use a Hornady Lock-N-Load Auto Charge or a similar device to ensure accurate powder charge measurements. Verify the seating depth with a micrometer, as excessive seating can lead to over-pressure. Use a chronograph to measure velocity, and compare it to the manufacturer’s specified velocity range.
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