I turned around 200 6mm into 243's some years ago to produce a longer neck in order to reach the rifling with light bullets. Made a gauge to determine the right length. I was young and thought it really mattered. It was interesting, though. Google Varmint Al, he might still have the info.
Also turned some (6mm's) into 257 Roberts for my kids rifle. That was a bit easier.
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"I should have picked alcohol, drugs, or beating my wife..."
Pete Rose
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