N/A White Powder

Lead oxide (corrosion). Cause? Neglect, laziness and ***disparaging remark removed***.
Rather harsh isn't it. Lead will corrode over time. I used to and still sometime cast bullets. Now they have probably around 10% tin content. When they come out of the mold they are very shiney. I have some that are over 50 years old and they are a somewhat dark gray now and eventually I would not be surprised if they develope a white film. I have seen old "antique" ammo with lead bullets that are a powdery white. Those were boxed in oak boxes and oak tannins will tend to make lead oxidize rather fast.
Personally I would spray them with some silicone, get a good coating and that should stop any further oxidation for a very long time.
 
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Rather harsh isn't it. Lead will corrode over time. I used to and still sometime cast bullets. Now they have probably around 10% tin content. When they come out of the mold they are very shiney. I have some that are over 50 years old and they are a somewhat dark gray now and eventually I would not be surprised if they develope a white film. I have seen old "antique" ammo with lead bullets that are a powdery white. Those were boxed in oak boxes and oak tannins will tend to make lead oxidize rather fast.
Personally I would spray them with some silicone, get a good coating and that should stop any further oxidation for a very long time.
Of course it is not harsh. It's truthful. We do not know who left the pellets in the weather. The OP did not say, Why do think it's harsh?