Need help with an alloy!

[HHD WV]

I have a friend who wants me to make him some bullets of Linotype and COWW. These will be for a .300 Blackout, subsonic loads. Mould is the NOE 311-247FN. Suggestions and comments will be appreciated. Thanks in advance. Harles

 

[Rick]

Were it me I would save the lino for when it's needed. The CWW would handle the sub sonic load well and wouldn't even need heat treating.

 

[Brad]

I would even cut the COWW 50/50 with pure and water drop. Save the good stuff for when it is required.
I cast mine from range scrap and water drop them. That alloy is about 1.75% Sb and less than .5% Sn. Heat treats easily to 18-20 BHn.

 

[Rick]

Cutting the WW would be fine but water drop for 18-20 BHN? For sub sonic? The WW with a bit of tin is 12 BHN and for sub sonic if anything is over kill.

 

[Brad]

They are subsonic but the pressure is still reasonably high. I would expect pressure in the 35-40 KPSI range.
My rifle will shoot fine with the lower BHn but I find it does a little better with the harder bullet. If nothing else it get deformed less on feeding.

 

[RBHarter]

Cut and quench .
<<<<<<
Cut will keep them from breaking up but that long nose needs the rigid hardening to clear the muzzle .
I've done a little work along those lines .........

 

[Brad]

That bullet is kinda fun to find in the berm. They often get bent into C shapes.

 

[fiver]

I quench the LEE version I have for sub sonic work too.
they clink and clank like a bag of quarters.

 

[HHD WV]

About what I thought, these answers I mean, but I thought I'd ask more experienced casters. Just in case. May just try samples of your replies, for the experience of it. Thanks to all of you. Harles

 

[fiver]

if he really needs to use both then a 3 to 1 mix ww/lino would do the job if you throw more tin in there you'll be close to a lyman #2 mix.
I wouldn't get too lino crazy though the noe mold most likely pours big to begin with.