If you are having problems with distortion and stretching caused when the resizing die expander ball passes through the case neck then FrankFord Arsenal Pure Ground Mica is just what you need. Just apply a small amount of Mica to the inside of your bottleneck cartridges to help minimize the distortion and stretching. FrankFord Arsenal Pure Ground Mica is clean, easy to use and will not contaminate your powder charge. Can also be used to reduce stickiness in lubricated cased bullets.

Use will the FrankFord Arsenal Case Neck Lubricator (Sold Separately)

Features:

• Minimizes stretching and distortion
• Clean and easy to use
• Will not contaminate powder charge
• Can reduce stickiness of cast bullets
• Only small amount required

Note: 

• Mica is to only be used as an inside the case neck lubricant on bottleneck cartridges and should not be used as a full length sizing lubricant. Full length sizing requires a standard case sizing lube.
• Comes in 1/10 oz and 4 oz.