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Discussion Starter #1
I'm trying to find a load for my 9mm 125gr cast rn with IMR SR-4756. I've looked everywhere and can't find anything. Plz help!
 

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Have you tried imrpowder.com? If not, you may want to give it a try. They should have that specific powder in there. It's worth a shot at least.
 

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Hodgdon owns IMR (DuPont) and Winchester powders now.

http://data.hodgdon.com/main_menu.asp

Is a better link.

Bullet Weight (Gr.) Manufacturer Powder Bullet Diam. C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure
125 GR. LCN ........... IMR SR 4756 ............. .356" 1.125" 4.2 972 24,400 PSI ... 4.8 1071 30,200 PSI
 

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Discussion Starter #4
Hodgdon owns IMR (DuPont) and Winchester powders now.

http://data.hodgdon.com/main_menu.asp

Is a better link.

Bullet Weight (Gr.) Manufacturer Powder Bullet Diam. C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure
125 GR. LCN ........... IMR SR 4756 ............. .356" 1.125" 4.2 972 24,400 PSI ... 4.8 1071 30,200 PSI
I can only find a load for 125gr lcn would that still be the same load for lrn?
 

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I can only find a load for 125gr lcn would that still be the same load for lrn?
LCN is lead conical nose, LRN is lead round nose.

Start at the starting load of 4.2 grain, like you should anyway, and work
your load up as you see fit.
 

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Discussion Starter #7
Range report: I took out my 9mm and the gun did not blow up even with the 4.8gr but from 4.2-4.8 the all keyholed and I have no idea why. Anybody know how to stop that?
 

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Range report: I took out my 9mm and the gun did not blow up even with the 4.8gr but from 4.2-4.8 the all keyholed and I have no idea why. Anybody know how to stop that?
Well you could be putting to much taper crimp on the bullet and squeezing the bullet down to where it doesn't fit the bore properly anymore or In my case I found that casting my own bullets and sizing them to .358" took care of the keyholing issue. Some 9mm handguns just like a fatter bullet.
 

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+1 on the crimping issue. I did that once with a 45acp. It can definately cause it.
 

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The bullets are not filling the chamber throat. Lead bullet loads are based on presssures measured in CUPs. The correct diameter for a cast 9MM should run .001" over a nominal of .355" to a .356".
Bullets that run a high Brennel or BHN needs higher pressure to up set and fill the throat. If you are runing a low BHN 5 to 6 you can use these lower pressure loads. Loading a BHN of 12 to 20 the loads should run much higher pressures. :)
 
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