Think I found the limit.

4.5 maybe?

Curious. Where were you before 5.1?

Hugger-4641 said:

Been working up some 9mm loads trying to use up some 70's vintage Red Dot. This was 5.1 gr behind 124gr FMJ RN in my Stoeger.
I only loaded a handful, but I think I'll tear those down and back it down to 4.8gr.
View attachment 1054870

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did you chono it? would love to know

I don't want my reloads looking like this factory ammo.

Primer flow is caused by an over sized hole vs the firing pin. In a perfect world it should only be 0.001"-0.0015". Anything over 0.003-0.004" normally shows primer flow on a HP round.

Hugger-4641 said:

Nope, didn't chrono it, but I'd venture 1250 or so. I might be brave enough to pop one more and chronograph if I ever get off work with some daylight left.

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I bet 100 (10mm brass) your closer or above 1300

Blue68f100 said:

over sized hole

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I am sure your correct. Looking at the primer, is a good clue.
No idea whats standard. https://www.thehighroad.org/index.php?media/albums/taurus-g3c-9mm-luger.317/&page=3

Hugger-4641 said:

I don't have any 10mm brass. But I guess if I won the bet I'd have a reason to buy a 10mm pistol

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No choice, you would have to buy a 10.

Its the law

Hugger-4641 said:

I don't have any 10mm brass. But I guess if I won the bet I'd have a reason to buy a 10mm pistol

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I mean… having brass and nothing to shoot it out of… should be punishable by at lease 10 years

Hugger-4641 said:

I don't have any 10mm brass. But I guess if I won the bet I'd have a reason to buy a 10mm pistol

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and beside, your already at 9mm.. 1 more mill and you don’t have to worry about pressure signs and little cases for your large hands

I don't know what your seating depth is.....I loaded at least 2000 9mm with 4 grains of Red Dot under a 124 plated flat point.. I think those were seated to 1.045 OAL - I'd have to check my notes to verify but I do remember velocity was about 1050. 6.1 seems to be too much of a good thing .

Mark_Mark said:

I mean… having brass and nothing to shoot it out of… should be punishable by at lease 10 years

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Nuts, I've got 40cal brass and never owned one. 10 years is a long time, ... wait what do we have to do for 10 years?

Stumper said:

I don't know what your seating depth is.....I loaded at least 2000 9mm with 4 grains of Red Dot under a 124 plated flat point.. I think those were seated to 1.045 OAL - I'd have to check my notes to verify but I do remember velocity was about 1050. 6.1 seems to be too much of a good thing .

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124 at 1350 is major power factor and lot of guns can handle it just find. They just load a little longer and stuff.

6.1 with those pressure signs… I’m thinking 1400+

Hugger-4641 said:

Been working up some 9mm loads trying to use up some 70's vintage Red Dot. This was 5.1 gr behind 124gr FMJ RN in my Stoeger.
I only loaded a handful, but I think I'll tear those down and back it down to 4.8gr.
View attachment 1054870

Click to expand...

That's more pressure than I like to see, but I generally shoot for middle of the road when reloading. It's easier on me, my guns, my supplies

Jonny2guns said:

Nuts, I've got 40cal brass and never owned one. 10 years is a long time, ... wait what do we have to do for 10 years?

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Community service, sort out steel and 22LR spent shells from the Brass Bin

Question, only because I have 8lb of Red Dot unopened, does Red Dot spike in pressure that quick, like more than Unique? I've loaded lots of Unique....some more than what they should have been, but don't ever remember getting anything close to those over pressure signs.

Alliant published data from 1999 - 9mm Luger

125 gr FMJ, RED DOT 4.6 grs Maximum, 1145 fps, COL 1.150" PSI 33,000

Hugger-4641 said:

Nope, didn't chrono it, but I'd venture 1250 or so. I might be brave enough to pop one more and chronograph if I ever get off work with some daylight left.

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You can't know what the velocity is by guessing. You can't go by what is printed in the load data either. For all you know your velocity is lower or much higher than you think.

Where did you get the Red Dot data for the 9mm? I checked several manuals and the Alliant load data site and they don't provide Red Dot load data in the 9mm.