9mm loading advice

[captn-tin]

Just been givin 500 rnds 122gr .355 cast fp bullets. Can't seem to find data for that particular weight bullet. Think it would be ok to use data for either 120gr or 125gr cast bullet of similar shape. Using data form Lyman Pistol and Revolver Handbook, third edition. Thanks in advance for any advice.

[CSACANNONEER]

I'll recommend using load data for the heavier bullet as long as the profile is very similar. As long as you're not pushing maximum loading, you'll be fine using either the 120 or 125 load data as long as the profiles are similar.

[captn-tin]

csacannoneer

I'll be loading to plinking velocities so I'll probably be using light - medium velocity data. Thanks for your input.

[hambam105]

I once used a listed powder charge intended for a 9x19mm cartridge loaded with 125 grain cast bullet and substituted
a 122 grain cast bullet instead. Sheet. Those bullets just bounced-off cardboard USPSA targets all day long.

[kcstott]

I once used a listed powder charge intended for a 9x19mm cartridge loaded with 125 grain cast bullet and substituted
a 122 grain cast bullet instead. Sheet. Those bullets just bounced-off cardboard USPSA targets all day long.

well it wasn't the 3 grain difference that caused that.

More likely it was your powder lot or your measurement technique.

[hambam105]

I remember during the components assembly phase I felt something tugging on my leg.

[kcstott]

I remember during the components assembly phase I felt something tugging on my leg.

if your being sarcastic you need to be way more obvious for me to pick up on that crap,

[bruce381]

might want to slug barrel I think .355 is kinda small?

[eaglemike]

might want to slug barrel I think .355 is kinda small?

Agree.
A friend slugged a Beretta long ago , wondering why it wouldn't shoot. IIRC it was .356, maybe .3565. We loaded some .357 lead bullets and it suddenly shot as it should.
I never understood why lead bullet mfrs sized 9mm that small. Most 9mm barrels need bullets larger than that, and my experience has been that .001 large is better than .001 too small (all other things done properly.
Jacketed stuff a different story, of course.

[TomReloaded]

.355 cast are prime candidates to be powder coated.

But definitely use 124 or even 125gr data. No problem there, but that size is going to lead up your barrel unless you coat them.

[stilly]

I'll recommend using load data for the heavier bullet as long as the profile is very similar. As long as you're not pushing maximum loading, you'll be fine using either the 120 or 125 load data as long as the profiles are similar.

This is the way. Then once you have a few made and feel comfortable, start changing lengths or charges and record your data while avoiding pressure buildups.