some cartridges...the .308 winchester for one... were designed in such a way that it is better to seat the buller really well in the case so it can line itself up with aid of case neck before it makes a "space walk" into the beginning of the rifling.
my norinco loves those 151s and havent seen leading as an issue...yes the cleaning patches come out black...but not a major issue.
bottom line is experiment and FIND OUT WHAT YOUR RIFLE prefers.....
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