Collar Button boolit in the 458 WM

[Pirate69]

Saw the quote below in a thread on reduced 45-70 loads. Anyone tried a Collar Button boolit in a 458 WM?

"If you want a fun comfortable plinking round change your boolit. That's essentially why the Collar Button boolit was designed, indoor (then) winter practice and plinking."

[mehavey]

The Win Mag has an extremely long freebore.
Don't know how the short collar button will handle that.

But I guess I could find out.


In a 45-70 as-Cast:0.460"/sized:0.459"/DGLube h=104 1/16" foam*gas checkNOT@powder
Lyman 457130 Button(30:1)147gr /RedDot/6.0/Starline/FedLR/OAL=2.318"
QL predicts 4,478psi/890fps(friction-ON) Crimp(½-turn)MidFrwdBand
* picnic plate
~~~~~~~~~~~~~~~~~~~~~~~~~~~
After a little reading and testing both primers & powder position sensitivity (which is Baaaaaddd -- from 300fps to 1,100fps / unburned powder all over the place), I decided to follow an older protocol to move the thin (near weightless) foam disk off the bullet base and down to a position 1/5" (.200") above the powder.

For that amount of powder, this creates a very reliable sloping powder position/surface akin to that in a 45ACP case. The rifle primer immediately blows it out of the way even before ignition really gets going and it's off to the races.

Velocity was a very consistent 1,086fps ± 08 for all 5 rounds.
Barrel was spotless/very little powder residual even before cleaning.