9mm LRN .356 or .357?

[y5e06]

I slugged the bore of my 24/7 and it came out to .355-.3555 (caliper precision +/- .0005).
What would be the best choice for cast bullets, .356 or .357? Is oversizing .002 a good decision? what about if the bullets are on the hard side 18+ BHN? I'm looking for minimal leading and increased precision w/ my plinking rounds. I'm thinking the 124/125gr variety.

thanks

 

[ReloaderFred]

I size my 9mm bullets to .356" and get no leading and excellent accuracy in my guns. Since your barrel slugged to .355", then I would go with .356" bullets as well.

Hope this helps.

Fred

 

[Walkalong]

.356 will be fine, although .357 probably will as well. Are you buying, or checking what to size them to?

 

[y5e06]

I'm will be buying. the place I have tagged sells either size for the same price.
thanks

 

[loadedround]

No question about it...9mm cast bullets should be sizes .356". Works for me.

 

[FredT]

.356 is the correct size. Going larger might bulge the case to the point that it will not chamber properly

 

[xer0]

I got the same results when I slugged my barrel. Sizing down to .356 gave me tighter groups, zero ledding, and heavy bullets I can use for reloading my 9mm... I really enjoy it when I can use one component for multiple applications. Resize down to .356.

 

[y5e06]

thanks for the responses, I'll tag a batch of .356's

 

[tding]

Size matters

I recently tried both .356 and .357 with my 9mm LRN over Bullseye and experienced a difference in muzzle velocity of between 400 and 500 fps, the .357 being the faster and obviously higher pressure.