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I have just started casting semiwadcutters in .357 158 grain using a lee mould. The bullet has the microgrooves on it for lubing with the Lee liquid allox. I am now substitutung these bullets for previously purchased 158 grain round nose flat point bullets. Powder type / charge, primers and cases are all the same as before, only the head is changed.
Powder - 4.2 grains of bullseye
Primer - CCI
Case - winchester.
The problem is that some of the bullets are tumbling in flight, hitting the target side on! Can anyone explain why this is happening? 5 out of a batch of 30 tumbled.
This never happened with the round nose bullets which were exactly the same weight.
The alloy I am using to cast is the same as I use for my 148grain wadcutters with no problems.
Any ideas?
Powder - 4.2 grains of bullseye
Primer - CCI
Case - winchester.
The problem is that some of the bullets are tumbling in flight, hitting the target side on! Can anyone explain why this is happening? 5 out of a batch of 30 tumbled.
This never happened with the round nose bullets which were exactly the same weight.
The alloy I am using to cast is the same as I use for my 148grain wadcutters with no problems.
Any ideas?