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beMatt

[9mm Major] TCFP OAL help

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Trying to work up a 9mm major load w/ 3N38 and RMR's 124gr TCFP pills. My usual 1.17 OAL for RNs doesn't work, of course, but what should I be using for these? I need to run ~9gr of powder to make major for my comp, but at what point am I compressing the powder *too* much? Can I run these at something like 1.10? Or less? Is there a RN-to-FP OAL rule of thumb or conversion table?

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3n38 hard to make major in 9 major

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7 hours ago, 36873687 said:

3n38 hard to make major in 9 major

Not from my experience. 

 

8.8gr is a big dose of 3n38 and thats what it took with a 124gr PD JHP to make 170pf. It is a full case, but 3n38 compresses ok. 

 

I dont think it is possible to compress enough 3n38 in 9mm to blow up your gun.   The issue you may find is that you get comp leading with the exposed base. 

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BTW, my CK has a short throat, but I load the PD JHP to 1.155" and the profile is very similar to the RMR TCFP. 

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8 hours ago, beMatt said:

  at what point am I compressing the powder *too* much? 

 

The good news in 9mm Major is you really don't have to worry about

compressing powder.

 

That said, you can get bullets start to drift out longer, if you're not careful.

 

I'd run The Plunk Test to get your longest OAL, and load it so that you still

have enough neck tension to hold the bullet in the case during the violent

transition from mag to chamber.

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2 hours ago, chevrofreak said:

Not from my experience. 

 

8.8gr is a big dose of 3n38 and thats what it took with a 124gr PD JHP to make 170pf. It is a full case, but 3n38 compresses ok. 

 

I dont think it is possible to compress enough 3n38 in 9mm to blow up your gun.   The issue you may find is that you get comp leading with the exposed base. 

My buddy had almost 9.9 to make 169. But his was a shorty

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Thanks for the help, all. Looks like I'll just plunk down to find my OAL for this projectile profile, then work the load back up from 8gr or so.

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