Please will you help me?
I am using the K+M neck lathing kit. The K&M mandrel is a snug fit into the neck of the case and I am using a graphite based grease with some STP additive mixed in. (Very slippery)
I am using hand power to perform the operation.
The cases that I am presently about to neck turn are some once fired donated .308 Peterson Lapua Palma's which have been full length resized, trimmed, chamfered and de-burred. The cases that I am practising on are from the same batch.
I am using the Sinclair Digital Thickness Gauge to measure
What I don't understand is why there is always a variation between the neck wall thickness at the shoulder (typically .014) and at the neck end (typically .013 to .0135) These measurements were only taken at points where the lathe had effected the metal.
1/2 a thou I can accept, but a full thou I don't understand.
What am I doing wrong?
Many thanks in advance.
EDIT:-
I THINK I may have the answer to my question. I have been trying to take too much off too fast.
The thickness at the shoulder was .014. I deepened the cut by .0004 and now I am getting a consistent .0135 where the brass has been effected.
I any of you have any more advice, I would still appreciate it.
I am using the K+M neck lathing kit. The K&M mandrel is a snug fit into the neck of the case and I am using a graphite based grease with some STP additive mixed in. (Very slippery)
I am using hand power to perform the operation.
The cases that I am presently about to neck turn are some once fired donated .308 Peterson Lapua Palma's which have been full length resized, trimmed, chamfered and de-burred. The cases that I am practising on are from the same batch.
I am using the Sinclair Digital Thickness Gauge to measure
What I don't understand is why there is always a variation between the neck wall thickness at the shoulder (typically .014) and at the neck end (typically .013 to .0135) These measurements were only taken at points where the lathe had effected the metal.
1/2 a thou I can accept, but a full thou I don't understand.
What am I doing wrong?
Many thanks in advance.
EDIT:-
I THINK I may have the answer to my question. I have been trying to take too much off too fast.
The thickness at the shoulder was .014. I deepened the cut by .0004 and now I am getting a consistent .0135 where the brass has been effected.
I any of you have any more advice, I would still appreciate it.
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