I would use 70/30 or 50/50. No need to go to Tin /antimony like you do for drinking water pipes. Use the easier to work with high lead , low melting point solder. Put some Oatey flux paste on there first(home depot)or get flux core solder wire.
If all goes as planned , we will be eliminating that crimp all together this year so you won't have to worry about solder.
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