No I don't have a 7x57 but I have an 8 x57 and a 9.3 by 57 and they all have lead loads. 10 grains of unique used to be the default setting for just about everything when I started.
I know that these are supersonic mostly but they are from a 19 60s Lyman book and may be of interest. 10 gr blue dot is my std load for the 3030 has been for 20 years
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