Factory Hornday 6mm ARC Black (105 gr BTHP) cartridge base-to-ogive is measuring 40 thou longer, than base-to-ogive using my Hornady 6mm ARC modified case & 105 gr BTHP bullet pushed hard against the lands.
The factory black ammo OAL measures 2.200" +/- .002; using the modified case & bullet shoved into lands my OAL is ~ 1.965".
If I cycle a factory cartridge, the bolt closes (this is AR platform), and then measuring the factory rounds after chambering shows no change in cartridge base-to-ogive or OAL. I would think the factory cartridge would shorten up?
Measuring the factory round and modified case headspace dimension, they're the same.
Why can I only push my bullet 40 thou less than factory cartridge base-to-ogive? Why/how is the factory ammo closing on the bolt?
confused...
The factory black ammo OAL measures 2.200" +/- .002; using the modified case & bullet shoved into lands my OAL is ~ 1.965".
If I cycle a factory cartridge, the bolt closes (this is AR platform), and then measuring the factory rounds after chambering shows no change in cartridge base-to-ogive or OAL. I would think the factory cartridge would shorten up?
Measuring the factory round and modified case headspace dimension, they're the same.
Why can I only push my bullet 40 thou less than factory cartridge base-to-ogive? Why/how is the factory ammo closing on the bolt?
confused...