Shooting .432 gas check in a .429 Super Blackhawk

If they’ll fit in the chambers they should fire fine. They’re a tad oversized so I wouldn’t max-charge the powder levels, but the Super Blackhawk is a tough, tough handgun so it’ll handle a lot without complaint. You may get a bit of side spitting if material is shaved as the bullets exit the cylinder mouths and cross the barrel/cylinder gap so mind that area when you’re shooting.

BHN of 22 is hard for lead, but it’s still a lot softer than bullet jacket material...so they’ll swage down the .002” to fit into the slightly smaller bore easily. I don’t think accuracy should suffer, let us know how they shooter for you.

Stay safe.

make a dummy round (no primer or powder, just a sized case w/bullet) and make sure it cycles through both weapons.

luck,

murf

p.s. make sure the round does not drag on the recoil shield as the cylinder rotates. rotate it a full 360 degrees.

Provided you're starting low: if the cartridge with a slightly oversized cast bullet will chamber it's a good place to start.

Sizing for the throat and neck, that is sizing down just enough to chamber without jamming, has long been a first step in the search for cast accuracy. Sometimes letting the charge size the bullet down a bit extra improves concentricity and obturation.

Here's a target shot with 2 3/4" M69 at 50yds over my range bag (not a fluke - verified on another day). The bullet is MT Bullet Works 260gr WFNGC sized .432". Never slugged barrel, but throats are .4295 (.429 plug gage-go, .430 no go). Have shot a number of these thru multiple .44 mags.



I don't know how may .454" cast I've shot thru a Freedom Arms M97 that has .452 throats with excellent accuracy and no indication of excessive pressure.

FWIW,

Paul

SAAMI cartridge and chamber diagrams I printed out gave .432 as bullet diameter. My Ruger Bisley runs .432 chamber throats and .4307 groove dia.. One I once owned had .433 throats. I load .432 bullets, but had to make an expander plug for the die set as I couldn't find one for that large of a bullet in .44 cal.. Good shooting Paul105!