Quote History Quoted:
Watch your primers for flattening. I had CCI 400's flatten out at 24.0g of H335.
CCI 450's don't flatten out like the 400's did due to the slightly thicker cup on the 450's.
The 450's will also have an easier time lighting ball powder especially in cold weather.
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I did a side by side comparison using CCI-400 and CCI-450. 55gr bullets and WC-844 powder.
I went from 22 to 25.5 gr in half grain increments.
The fired primers all looked the same. In fact some of the 450s looked flatter than the 400s with the same powder charge.
After mixing the fired casings you couldn't tell them apart.
I really don't know what the fuss is about flat primers. Most small rifle primers are going to flatten more than what we are used to seeing in large rifle.
"Reading" small rifle primers has widely been accepted as being meaningless by itself.
As long as I'm within published data and everything else checks out, I could not care less about how flat my small rifle primers are.
If I was a troll I could post photos of thousands of fired casings with flat primers and have everyone here screaming to back the load off and every photo is of a factory loaded cartridge.
Motor