Do my 200gr no.9 velocities make sense?

[Throttlejunky]

I'm getting 1325 fps with 200 grain .402 gas checked hardcast out of a lone wolf 6" With accurate#9 powder. I am only at 13 grains. Max load is 14gr at 1216fps with a tmj bullet out of a 5" barrel per my speer manual. I have ladders all the way to max, but I stopped because the velocity was high. Will also note book calls for oal of 1.250, I am at 1.2485 because of the wide meplat.
Is it the perfectly sized .402 bullet driving pressure? I cant see oal coming into play. 1" of barrel shouldn't do that. Thanks guys!

[The_Shadow]

Well cast bullets can actually seal the bore better and take full advantage of the pressure, also you are using a 6" barrel and that 1" extra also makes a good bit of difference for velocity.  Yes the shorter COL can yield a a little more pressure for a given load.
Therefore when you add up all of the these factors the gains can also add up to the results you have seen.  Enjoy the performance!

[Throttlejunky]

I must be over pressure to achieve that velocity.

[The_Shadow]

I must be over pressure to achieve that velocity.

I doubt it is over pressure, what did the primers look like?  That 1" longer barrel can add 100 fps to a specific load.

[Throttlejunky]

Watch "G40 10mm primer" on YouTube
https://youtu.be/pvhXKPVmi5c

[The_Shadow]

No problem with the primer as shown either...

[Throttlejunky]

Really.......
That's good news. I thought that was textbook warning. Can you show me an example where you would be concerned?

[The_Shadow]

Look at this primer flattened by the older AA#9

[Throttlejunky]

Thank you very much.

[TODDXUSMC]

I average 1263 in a 5" 1911. I use 12.5gr of AA9 with the 200gr wfngc hc bullet. I haven't chronographed the load from my 6" Tangfolio Hunter. I figured it should at least do 1280fps.
That is absolute max load in the 1911, this particular 1911 has an extremely tight match chamber. Your Glock is most likely much more generous than my 1911 in the chamber, thus your higher load density.


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[cwlongshot]

First of all,  the manual is a guide. Its what worked and what was safe in THAT FIREARM.  Its up to the person building loads to determine safe limits.

Second there are fast and slow barrels. EVERY-SINGLE barrel is a entity unto itself.

Then there are some variables.  False velocities can be had if the chrono is too close and reading the gas expelled from the muzzle. Seating depth changes volume which changes pressures.   As mentioned cast can seal better and are more slippery. They are NOT just light bullet loadings.

Primers alone are VERY POOR indicator of pressure. Measure your case head and learn whats normal for your given barrel. Different primers react entirely differently. Federal primers for instance are KNOWN to me soft and what if some rifle mag primers found there way into a given loading. They have a thicker cup. What if a given piece of brass had a smaller flash hole??  Case head expansion, excessive recoil, functional problems and different/excessive noise are far better indicators of excessive pressure.

CW

[Throttlejunky]

Appreciate all of you. They are federal primers. I know lead is  more slippery. I slugged the bore to size the bullets. I was concerned the properly sized bullets were resulting in higher pressures, not taking better advantage of existing pressures. I dont have the bench hours needed to expect extra 50fps for lead, or extra 100fps for an inch of barrel. I got a number on a chrono that was much higher than expected. I Shot all 5 but didnt go to my next ladders. Was very concerned.  Really dont see any need to go farther. I'm getting more than I expected. Plenty for a deer or a black bear head on. I will look into case head expansion. There is no split cases, no glock bulge, no function issues, no excessive recoil or noise I can tell with my muffs on.  My brass is landing about 10 feet to my right upon ejection.

[cwlongshot]

All that leads me to believe it may have just been gases.  Might simply have been too close to the muzzle of your gun. Less than 10' could be the issue.

Fed primers flatten quick & easilly

Glad you mention Ejection. Because heavy loads produce more slide velocity. This produces distance the empties travel.

CW

[ss30378]

Your velocities are similar to what I got with aa9. 

12.8g aa9 with a 220g cast bullet ran 1288fps in my 5" 1911 and 1330fps in my 7" g40.

[Taterhead]

Another data point. 13 gr A9 under a coated 200 gr bullet runs 1215 fps from my 4.6" barrel. So the reported results are not too far out of the realm of expectations.

Agree wholeheartedly with CW that primers are a poor indicator of pressure.