Good looking bullet, Ed, practically hemispherial nose - good shape. I would use a 50:50 WW/lead mix.
That mixture worked REALLY well in my .50 Alaskan Rolling block, right up to almost 2,000fps. SPG for lube, or Paul Mathews mix of Beeswax:Vaseline. My mix was 60:40 by volume.

I recently bought a 2 cavity set of blocks from Accurate Moulds in Brass. I sprayed them with Lyman Moly bullet spray lube & they cast beautiful bullets.

Just looking at the bullet again, I really like the design, hemispherical with a small flat nose that could have been larger, but it's just fine due to the bullet's nose being hemispherical in overall shape.
Lt.James Forsyth would agree.