Seating 9mm

[wiiawiwb]

I'm not new to reloading but am brand new to reloading 9mm. I'm using 124 gr. coated lead bullets from MBC. I'm not sure where on the bullet I would target initially for seating depth.

I've included a picture below and marked two areas on the bullet. Would you suggest I seat to "A" then measure OAL length or seat to "B" then measure OAL length?

 

[CZ9shooter]

Seat them to where they fit and function in your gun(s). You are gonna be somewhere in between A and B.

 

[Dudedog]

You need to do the plunk test on your pistol to determine the longest OAL you can use then go a hair shorter than that.

I load the MBC 9mm 124? 125gr SWCs to about 1.07-1.08.
Most of my pistols will allow longer but I load for the one that needs them the shortest.
(and yes most likely between A+B, since its tape crimped you dont have to try to crimp in the grove like a roll crimp)

They shoot well for me. Hope they work out for you.
Remember MBC offers THR members a 5% discount with the code.

 

[wiiawiwb]

You are correct, it is 125 gr bullet. I will be reloading for my Glock 17 and will do the plunk test to make sure a dummy round passes it in the G17 barrel. Yes, thanks for reminding me. I have used that code before to order bullets from MBC.

 

[Sunray]

Likely a couple thou below 'A'. Seat 'em to 1.169" OAL.
That bullet shape feeds like hot dam through my Inglis. 121 grains though. Been using 'em for eons.

 

[Ed from Maine]

seat too deeply...???

My last batch of 9mm reloads, two casings evidently had not been fully resized, and the 147 gr plated (Berry's) bullets slid right down to the powder. Discard them? I read that you can have too much pressure if a 9mm is seated too deeply?

 

[vaalpens]

I loaded a few of these SWC's and they loaded and cycled very well in my SIG SP2022. The COL I used was 1.075", which based on my calculation put the mouth of the longest case about .03" below the shoulder.

You need to make your determination based on the longest 9mm case (.754") since you will probably be using mixed brass.

You also need to take into consideration that these SWC's will be seated deeper into the case due to shape, so the charge should be adjusted lower if you are looking at cone load data and try to apply it to your SWC bullets. I loaded the SWC's with .2gr less AutoComp when I started my load workup.

Enjoy and be safe.

 

[wiiawiwb]

I was planning on using the load data from Lymans 49th for a 120 gr cast bullet #356402 with a profile very similar to the one I bought from MBC. It lists it with an OAL of 1.110".

I have Unique, 700-X and HS-6 powder to use. HS-6, at the starting 5.0 gr., sits lower in the case than do the other two at their respective starting grains.

HS-6, 5.0 grs is what I planned on using. Does that sound about right?