If you are leading significantly at those loads I would be suspect of a rough barrel somehow.
I had a 52 and it never leaded at all. none zilch
Do you have access to a bore scope or perhaps a jewelers loupe?
I had a Gold cup that leaded like mad, took a look inside with a bore scope and i was amazed at the condition of the rifling, it looked good to the naked eye but under magnification it was a gravel bed. I fire lapped it and it helped, but not till i got a new bar sto barrel was it eliminated.
There are a few ideas,
one: really look hard at the barrel every five rounds to see if you can see where the leading is starting.
two: swaged lead (hornady and speer) are really really soft. they can lead at 800 feet per second in some barrels. try a harder cast bullet just to see.
three: Laser cast bullets with a silver content seem to work for me.
four: if this does not work, try sending the barrel to SW and see what they say.
five: try to fire lap it (loading a few bullets with lapping compound instead of lube) and see if this helps. This really really helped a couple of Rugers I had.
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