COAL Differences

[OleEd]

I been reloading 124 and 147gr for about 10 years now but want to start reloading 115 gr for my 9mm pistols - primarily my Sig m11A1 and my Sig 320 compact for steel shot matches.

Upon checking my manuals for AA#7 powder, I have found that:
Speers Man. shows an OAL of 1.135"
Hornandy #9 shows an OAL of 1.100"
Checking Hodgon and Alliant web sites I have OALs: HOD-1.120" and ALL-1.135"

Would someone please suggest a good OAL to start with? And why the variances?

Thanks

 

[Bandit67]

I think you should use the data for COL from the bullet manufacturer as long as it passes the plunk test. What make of bullet are you using?

 

[troy fairweather]

I been reloading 124 and 147gr for about 10 years now but want to start reloading 115 gr for my 9mm pistols - primarily my Sig m11A1 and my Sig 320 compact for steel shot matches.

Upon checking my manuals for AA#7 powder, I have found that:
Speers Man. shows an OAL of 1.135"
Hornandy #9 shows an OAL of 1.100"
Checking Hodgon and Alliant web sites I have OALs: HOD-1.120" and ALL-1.135"

Would someone please suggest a good OAL to start with? And why the variances?

Thanks

It really depends on the ojive of the bullets used. Use what the bullets maker recommends and start there.

 

[mokin]

I can only concur with the above advice. Additionally, if in doubt, go with the length recommended for the most similar bullet profile.

 

[hot chili powder]

Whatever bullet you are using as long as your ammo passes the plunk test it will "work". Some pistols have short chambers while some have longer ones.....my CZ P07 Duty has a short chamber and some recommended COLs fail the plunk test in my gun, just sayin'.

 

[jell-dog]

0leEd,
Check out post 9 here:
https://www.thehighroad.org/index.php?threads/9mm-oal-question.806406/#post-10298630

JD

PS
1.135 works well in my Sig M11-A1 9mm.

 

[OleEd]

Wow. I haven’t changed Bullets in a LONG time since the ones I use are just right for my weapons. With their own OALs using “the plunk test”.

Thanks all for your comments. A simple action like the “plunk test” I’ve forgotten. I did this when my son bought his last 9mm in Dec 17. The manuals suggest the one for the weapon they used for testing. I better go back and review my notebook.

Again thank you all.