Quick Answer
A crimp of 0.020 to 0.030 inches is ideal for most rifle cartridges, as it ensures secure seating of the bullet without over-compressing the case neck.
Crimp Depths for Specific Cartridges
When it comes to crimping rifle cartridges, the ideal depth varies depending on the cartridge case and bullet design. For example, a .308 Winchester case with a 150-grain bullet may require a crimp depth of 0.025 inches, while a .300 Winchester Magnum case with a 180-grain bullet may require a crimp depth of 0.030 inches. It’s essential to consult the reloading manual or manufacturer’s recommendations for specific crimp depths.
Measuring Crimp Depths
To ensure accurate crimp depths, it’s essential to use a precision-measuring tool, such as a caliper or a micrometer. Measure the crimped case at multiple points, including the center and the edges, to ensure consistency. A consistent crimp depth is critical to prevent over-compression of the case neck, which can lead to case head separation or other safety issues.
Crimping Techniques
When crimping rifle cartridges, it’s essential to use the right technique to avoid over-compressing the case neck. Use a consistent, gentle pressure to seat the bullet, and avoid applying excessive pressure that can cause the case to over-compress. For most rifle cartridges, a crimping force of 5-10 tons is ideal, although this may vary depending on the specific cartridge and bullet design.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.