Sheridan has just now offered up slotted gauges for the 6MM ARC cartridge. I find these gauges to be absolutely essential in my reloading. I use them for multiple calibers, 300BLK, 223/556, 308/762, 6.5CM, 45ACP and now 6ARC. https://sheridanengineering.com/product/...ion-gauge/ When I began...