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bomadera

O.A.L.

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What is the ideal o.a.l. for a 9mm 124 JHP (Hornady XTP)?
I have been loading this per Hornady's recommendation (most accurate load tested) of 1.060 with excellent results.  Yet Federal, Speer, and Sig all load longer 1.100-1.130
What have all of you found to be the ideal o.a.l?

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You have to use what runs best in your barrel, not theirs.  If you have excellent results with your load,  then you have an excellent load, including OAL.

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50 minutes ago, bomadera said:


I have been loading this per Hornady's recommendation (most accurate load tested) of 1.060 with excellent results. 

 

If you're happy, that's the Perfect OAL.     :)

 

To explore alternatives, I'd try to run The Plunk Test - see if you

can lengthen that OAL and still get excellent results.

 

Are you shooting 9mm Minor, or 9mm Major ?

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Posted (edited)
12 minutes ago, Hi-Power Jack said:

 

If you're happy, that's the Perfect OAL.     :)

 

To explore alternatives, I'd try to run The Plunk Test - see if you

can lengthen that OAL and still get excellent results.

 

Are you shooting 9mm Minor, or 9mm Major ?

I've tried the plunk test but I keep going back to the short 1.060 because of the accuracy. BTW my load is 5.4 of

Power Pistol @ 1.060 gets me over 1100fps

Edited by bomadera

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Then stick with it.!! 

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1.140 OAL on a 124 works perfect for me. It's long yet not too long that it wont get stuck in Glock mags or similar gun magazines.

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power pistol is a some what slow burning powder.  You will get better results with a faster burning powder.  N320, WST, sport pistol, clean shot, HP38 ,231

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I think this is a barrel specific issue. If it works for you then keep doing it. I wouldn't put much stock into what functions in other barrels. 

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OAL is subjective to magazine dimensions, gun reliability preference, chamber depth, bullet profile, and effect on chamber pressure. Generally speaking the faster the powder the more sensative the OAL plays on chamber pressures. With minor loads in a 9mm running a shorter OAL with middle of the road powders (231 on up to WSF or HS6 or slower) is usually not a concern for pressure spikes and you can afford to run on the short side. Faster powders like Bullseye, Titegroup, and especially Clays will spike pressure pretty quick when you shorten OAL. Most chambers are cut deep enough to allow for longer OAL but depending on the bullet profile you may have no choice but to run shorter than published OAL. I had a Tanfo with a short chamber and it ran 1.070 OAL with any TC or RNHP to chamber and it had feeding hangups. I switched to plain RN and was able to get a longer OAL and it ran reliably. All the 9mm's Ive ever owned had better function with OAL at the longer end of the spectrum. But if you are getting 100% reliability with your shorter OAL and you have no over pressure signs than go with it! 

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