I just saw a 480 gr spitzer lead bullet design a few days ago, that was either getting the particulars worked out for a group buy, or was in the waiting period before production.
...But I can't find it, now! It's driving me nuts.
Anyway...
The point was very similar to this ridiculous
NOE 454-260-SP.
If I come across the bullet again, I'll post a link.
On the NOE note... How about a 535 gr 'Postell-inspired' RN? (.380 BC.)
461-535-RN or
459-535-RN
.....And now I see that you went .357 Max instead.
Anyway...
If you want to pull the .45-70 back out of hibernation, give the entire selection of applicable bullets in Accurate Molds' catalog a look-see. There are a lot of options, and everything in fully-configurable (with a 0.180" minimum meplat being a limitation in this case).
There's also no additional charge to send in a design and have him (Tom) add it to the catalog for you to order.