seating depth for Missouri bullet?

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buddyd157

buddyd157

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hi all, i was referred here by someone at Missouri Bullet co.

i have an ammo can full of these...from buying the reloading room stock and press, from the RSO at my range.
---------------------------------------------------
#356125M
.356 Diameter
9mm Parabellum
124 Grain 9MM RN
Brinell 18
Bullet OAL .583 +/-
For General Shooting
---------------------------------------------------
i tried looking up seating depth, but could not find it. i tried contacting Missouri Bullet, and "Josh" referred me here for that information.

so, those are the specs, what should i set the seating depth at?

i have yet to dial in the final adjustments to my Dillon 550c, with Lee dies. the only Dillon die, is the powder funnel/die, so that i can use the dispenser.

thanks in advance

Buddy157
 
I think the simple answer would be to set the depth to the longest which passes the plunk test and feeds in all your applicable pistols. To be clear, I have no experience with that bullet -- just how I would approach it. I'm sure more experienced pistol loaders will have more helpful data than I.

@LiveLife has helped me in the past with finding *optimal* seating depths for 9mm where no official data is provided. I don't have the links to his threads on the topic handy, but I will try and dig them up.

Update: found the thread I was referencing above: https://www.thehighroad.org/index.p...let-max-working-oal-col-for-reference.848462/
 
Last edited:
I would start out with book data (124 LRN in Lyman manual) and use the plunk test. Adjust if necessary...
 
Like the others said above. Load one to spec oal (1.169" I think, but look it up), then plunk test. Shorten it until you get a length that works.

I ended up at 1.150" using that bullet. That passed in the three 9mms that I load for, but make sure you check it in your barrel.
 
There is no specific seating measurement. It depends of your gun

Look in any manual or powder company for a similar shape bullet and go from there.
 
buddyd157 said:
tried contacting Missouri Bullet, and "Josh" referred me here for that information.
Click to expand...
How "Josh" almost got fired 14 years ago - https://www.thehighroad.org/index.php?threads/new-9mm-bullet.484429/page-2#post-6110423

"Josh, our day sizer guy, was sizing .38 Match and .357's on two sizers. Well, one of those sizers had run the 9mm SmallBall the previous day and Josh forgot to change the die in that one. So, we wound up with 118,000 .38's and .357's, half of which were sized to .356 instead of .357 ... I made the decision ... and shipped out 118,000 replacements to over 75 customers. That took 3 days ...

Jo Ann wanted me to fire Josh. I explained that I had too much invested in him to fire him. And now he's our best employee. Not bad for a 20 year old kid, I think."
​
And who knows, Josh now could be running MBC ... :)

buddyd157 said:
MBC ... 9mm ... 124 Grain 9MM RN ... General Shooting

what should i set the seating depth at?
Click to expand...
As others posted, you should use the barrel to determine the Max OAL and function test from magazine for Working OAL. And if you are loading for multiple pistols, use the shortest OAL that will work in all of them - https://www.thehighroad.org/index.p...rel-find-a-max-o-a-l-with-your-bullet.506678/

1.040" OAL works with my Lone Wolf barrel with very short leade. 1.050"-1.080" OAL should work with most factory barrels. Here are some max/working OALs - https://www.thehighroad.org/index.p...col-for-reference.848462/page-2#post-12249361
  • 1.110" - Glock 22, KKM 40-9 conversion barrel
  • 1.080" - M&P Shield 9mm, factory barrel,
  • 1.050" - Glock 22, Tactical Kinetics 40-9 conversion barrel
  • 1.040" - Glock 23, Lone Wolf 40-9 conversion barrel

When Brad designed and ordered the bullet mold for 124 gr RN (SmallBall!), it had shorter and more rounder tip that increased the bearing surface of the bullet that engaged the rifling (Compare the bullet base length to more typical pointed RN to the right that requires OAL of 1.125" to chamber in most barrels)

index.php


MBC RN's shorter more rounder tip requires OAL around 1.050" - 1.080" for the base of bullet to clear the rifling of many barrels.

index.php

index.php
 
Last edited:
LiveLife said:
How "Josh" almost got fired 14 years ago - https://www.thehighroad.org/index.php?threads/new-9mm-bullet.484429/page-2#post-6110423

"Josh, our day sizer guy, was sizing .38 Match and .357's on two sizers. Well, one of those sizers had run the 9mm SmallBall the previous day and Josh forgot to change the die in that one. So, we wound up with 118,000 .38's and .357's, half of which were sized to .356 instead of .357 ... I made the decision ... and shipped out 118,000 replacements to over 75 customers. That took 3 days ...

Jo Ann wanted me to fire Josh. I explained that I had too much invested in him to fire him. And now he's our best employee. Not bad for a 20 year old kid, I think."
​
And who knows, Josh now could be running MBC ... :)


As others posted, you should use the barrel to determine the Max OAL and function test from magazine for Working OAL. And if you are loading for multiple pistols, use the shortest OAL that will work in all of them - https://www.thehighroad.org/index.p...rel-find-a-max-o-a-l-with-your-bullet.506678/

1.040" OAL works with my Lone Wolf barrel with very short leade. 1.050"-1.080" OAL should work with most factory barrels. Here are some max/working OALs - https://www.thehighroad.org/index.p...col-for-reference.848462/page-2#post-12249361
  • 1.110" - Glock 22, KKM 40-9 conversion barrel
  • 1.080" - M&P Shield 9mm, factory barrel,
  • 1.050" - Glock 22, Tactical Kinetics 40-9 conversion barrel
  • 1.040" - Glock 23, Lone Wolf 40-9 conversion barrel

When Brad designed and ordered the bullet mold for 124 gr RN (SmallBall!), it had shorter and more rounder tip that increased the bearing surface of the bullet that engaged the rifling (Compare the bullet base length to more typical pointed RN to the right that requires OAL of 1.125" to chamber in most barrels)

index.php


MBC RN's shorter more rounder tip requires OAL around 1.050" - 1.080" for the base of bullet to clear the rifling of many barrels.

index.php

index.php
Click to expand...
yes, i have several 9mm's to shoot, not just one.

so i'd be looking for an "all around size" so to speak.

but then too, shouldn't i be concerned with internal pressures?

since i will be starting out, i know i should cut down on the grains for a while.

also, ALL my guns, from my .22LR, to my .45 ACP's have factory barrels.
 
buddyd157 said:
i have several 9mm's ... looking for an "all around size" ... shouldn't i be concerned with internal pressures?

... since i will be starting out, i know i should cut down on the grains for a while.
Click to expand...
I also load for multiple pistols/barrels and when I am conducting initial powder work up and my shortest working OAL is shorter than published OAL, I will consider reducing my start/max charges by .2-.3 gr depending on the OAL reduction and powder being used.

What powders are you thinking about using?
 
LiveLife said:
I also load for multiple pistols/barrels and when I am conducting initial powder work up and my shortest working OAL is shorter than published OAL, I will consider reducing my start/max charges by .2-.3 gr depending on the OAL reduction and powder being used.

What powders are you thinking about using?
Click to expand...

yes, when i bought the RSO's reloading room, it included 2, --- 1 pound containers of, Alliant Powder, "Bullseye" smokeless.

i have checked the charge needed for a 9mm, but i was told, and i have read numerous times, to not start out with a full charge, but a "lesser" charge until i get experience.

thanks
 
thanks guys, i appreciate the information. i hope to get my Dillon dialed in by the end of the week. being retired, i have more things to do around the house now, then when i was working, so my time to stay with the equipment on a daily basis and start reloading sooner is a fantasy.

i have printed up many of the things all of you have said, for my reference.
 
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