I am thinking of building an open sighted 50 class bolt action together.

Seems the variety of the .510 bullets for the Jeffery/NE are more available than the 505's but the Gibbs has brass with more powder capacity/lower pressure potential for velocity than the Jeffery.

Opening up a 505 Gibbs case mouth to 510 seems no great problem.Thus a 510 Gibbs wildcat seems the best combo----

Any opinions on this wildcat? Any suggestions for obtaining reloading components and the best 505 Gibbs brass for this wildcat?

Thanks for any and all opinions!!