Best For 1876 Rem Rolling Block 12.7mm - Lead or Wheel Wt Metal ?

[DoctorBill]

I have been reloading for two Carl Gustav Rolling Block rifles - both with Trail Boss.
Previous user employed 14 gr of Unique in both of them.

Been using pure lead Mini Balls (LEE MOLD 500-354-M) in the .50 Alaskan Reformed Brass with
15 gr of Trail Boss (TB) for the 12.7mm rifle. Works great ! Hexagonal holes in the targets.
Running out of the cast Lead guys and need to recast some more.
https://i.postimg.cc/ncxddksM/LEE-90471-Bullet-Shape.jpg
https://i.postimg.cc/pL0yd8zY/Martini-Shooter-s-Carl-Gustav.jpg



Then been using 8mm LEE Cast Bullets in Wheel Weight metal (capped) in the other
8mmx58R Carl Gustav with Brass reformed from 45-90 Brass. Got 92% finished Brass.
That works great also with 15 gr of TB. 1896 stamped
https://i.postimg.cc/Z5yV5pr3/My-New-Danish-8mm-Rolling-Block-01.jpg

Question - for the 12.7mm CG RB, is there any reason not to use Wheel Weight Metal
to cast those LEE 363 gr Mini Ball Bullets ? I am keeping the loads fairly light in this
old rifle with TB and Cotton Filler. Stamped 1896 on the Wood Stock. Knox Body shaped
Barrel before the Receiver. Re-barreled for Cordite ?

I am assuming the harder WW metal would up the internal pressure a bit. ? ? ? ?

DoctorBill

[Whole Bunches]

I can only say what I use with nice results. Lee 515-450, cast from 20/1 lead/tin, weighing 445gr, sized to .512”, lubed with NRA 50/50 and 12gr Unique. LBT says mine are 10bnh. Average 1005fps and no leading. My groove diameter is .512”. I see no problem with W/W as long as the boolits are not undersize for your bore. I seat my boolits out as much as I can for my rifle and still chamber.

[Bad Ass Wallace]

Shouldn't be a problem, my 12.7 has bore/land of 0.508/0.492" so plenty of deep rifling to bite into any boolit.