Reloading Error

[papafloyd]

I had some 300blk cases that I had forgot about and decided to reload a few. To be honest I am a beginner that hasn't reloaded in approx. 2yrs so I wrote some notes and off I went. I used my loading info from Hodgdon website as I have used them before. Anyway when I made my notes I made an error, instead of COL of 2.21 I put 2.1! So here is my load and I'm hoping someone with more experience can give me some direction. As mentioned the cases were already done and ready to go.

Powder: Winchester 296 at 14.5 to 14.7gr. Goal was 14.5
Bullet: Hornady Amax 178gram
Primer: Standard small rifle CCI
COL: 2.1 Should've been 2.21

My concern is the added pressure that will be created from the additional depth. Should I be concerned? Not sure how much extra pressure this would create. Thanks for any suggestions offered.

[xfer42]

Hornady lists COAL 2.210, 12.9gr for 296 and 14.1gr H110.
Hodgdon site shows much more powder, but different bullets.

I would expect flattened, cratered primers and damaged brass.

[LynnJr]

You won't notice much because of the seating depth as it is only 0.110 difference.
Your accuracy might change.

[papafloyd]

Thanks for the responses.
Pretty big difference between Hornady and Hodgdon. They didn't list the 178gr so I stayed between the parameters of the 175 and 180gr. Obviously other than the COL.
I can live with the accuracy issue as it will just be used for range shooting, maybe I can use it as an excuse!

Going to go load a few more at the correct COL!

Thanks again gentlemen.

[EBR Works]

If you don't have one of these, get one and this situation is easily resolved:

https://www.midwayusa.com/product/1012943183?pid=680804

https://www.midwayusa.com/product/1012921422

[ar15barrels]

My concern is the added pressure that will be created from the additional depth.
Should I be concerned?
Not sure how much extra pressure this would create.
Thanks for any suggestions offered.

Here is two different quickload simulations with your two different sets of conditions:

Cartridge          : .300 AAC Blackout (SAAMI)
Bullet             : .308, 178, Hornady A-MAX 30712
Useable Case Capaci: 18.012 grain H2O = 1.169 cm³
Cartridge O.A.L. L6: 2.210 inch = 56.13 mm
Barrel Length      : 16.0 inch = 406.4 mm
Powder             : Winchester 296

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.667% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-06.7   79    14.00   1645    1070   36936   3964     97.5    1.232
-06.0   79    14.10   1655    1083   37630   3988     97.7    1.222
-05.3   80    14.20   1666    1097   38336   4012     97.8    1.211
-04.7   80    14.30   1676    1110   39055   4036     98.0    1.202
-04.0   81    14.40   1686    1124   39788   4059     98.2    1.192
[B]-03.3   81    14.50   1696    1137   40533   4082     98.3    1.182[/B]
-02.7   82    14.60   1707    1151   41292   4104     98.4    1.173
-02.0   82    14.70   1717    1165   42065   4126     98.6    1.163
-01.3   83    14.80   1727    1179   42851   4148     98.7    1.154
-00.7   84    14.90   1737    1192   43652   4169     98.8    1.144
+00.0   84    15.00   1747    1206   44468   4189     98.9    1.135
+00.7   85    15.10   1757    1220   45299   4209     99.1    1.126
+01.3   85    15.20   1767    1234   46144   4229     99.2    1.117
+02.0   86    15.30   1777    1248   47006   4248     99.3    1.108  ! Near Maximum !
+02.7   86    15.40   1787    1262   47883   4266     99.3    1.100  ! Near Maximum !
+03.3   87    15.50   1797    1277   48776   4284     99.4    1.091  ! Near Maximum !

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba     84    15.00   1771    1239   47032   4156     99.6    1.110  ! Near Maximum !
Data for burning rate decreased by 3% relative to nominal value:
-Ba     84    15.00   1721    1170   41936   4204     97.9    1.162

Cartridge          : .300 AAC Blackout (SAAMI)
Bullet             : .308, 178, Hornady A-MAX 30712
Useable Case Capaci: 15.941 grain H2O = 1.035 cm³
Cartridge O.A.L. L6: 2.100 inch = 53.34 mm
Barrel Length      : 16.0 inch = 406.4 mm
Powder             : Winchester 296

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.667% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-06.7   89    14.00   1708    1153   45678   3818     98.4    1.139
-06.0   89    14.10   1719    1167   46639   3838     98.5    1.129
-05.3   90    14.20   1730    1182   47620   3857     98.7    1.119  ! Near Maximum !
-04.7   91    14.30   1740    1197   48623   3876     98.8    1.110  ! Near Maximum !
-04.0   91    14.40   1751    1212   49647   3895     98.9    1.100  ! Near Maximum !
[B]-03.3   92    14.50   1762    1227   50694   3913     99.0    1.091  ! Near Maximum ![/B]
-02.7   93    14.60   1773    1242   51763   3930     99.1    1.082  ! Near Maximum !
-02.0   93    14.70   1783    1257   52855   3947     99.2    1.072  ! Near Maximum !
-01.3   94    14.80   1794    1272   53972   3963     99.3    1.063  ! Near Maximum !
-00.7   94    14.90   1805    1287   55113   3979     99.4    1.054  !DANGEROUS LOAD-DO NOT USE!
+00.0   95    15.00   1815    1302   56280   3994     99.5    1.045  !DANGEROUS LOAD-DO NOT USE!
+00.7   96    15.10   1826    1317   57472   4009     99.6    1.037  !DANGEROUS LOAD-DO NOT USE!
+01.3   96    15.20   1836    1333   58692   4023     99.7    1.028  !DANGEROUS LOAD-DO NOT USE!
+02.0   97    15.30   1847    1348   59939   4036     99.7    1.020  !DANGEROUS LOAD-DO NOT USE!
+02.7   98    15.40   1857    1364   61214   4049     99.8    1.011  !DANGEROUS LOAD-DO NOT USE!
+03.3   98    15.50   1868    1379   62518   4061     99.8    1.003  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba     95    15.00   1838    1335   59647   3943     99.9    1.024  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba     95    15.00   1790    1266   52955   4028     98.8    1.069  ! Near Maximum !

The difference in seating length moves the load from 40,000PSI to 50,000PSI.

[pacrat]

The difference in seating length moves the load from 40,000PSI to 50,000PSI.

https://en.wikipedia.org/wiki/.300_AAC_Blackout

According to "wiki and SAAMI" that is 5k psi under MAX of 55k psi.

But not necessarily safe in your rifle.

One of these ...... a few gentle whacks ...... and reset seater stem. Would bring peace of mind.

https://www.amazon.com/Impact-Bullet-Different-Expandable-Collets/dp/B07WDNH81Q/ref=sr_1_1_sspa?dchild=1&gclid=Cj0KCQjwpreJBhDvARIsAF1_BU28fsaFO56rbBoo0Pnuzr4cjun6oTXzwL2aMSOli9Kd9yo1hUwPUmAaAtKrEALw_wcB&hvadid=153647067754&hvdev=c&hvlocphy=9031058&hvnetw=g&hvqmt=e&hvrand=5172225015994844702&hvtargid=kwd-3376910093&hydadcr=9406_9465055&keywords=inertia+bullet+puller&qid=1630465025&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEySEE3SEowWDQxMk1RJmVuY3J5cHRlZElkPUEwOTY1MjY0MkQ0R05HWE40WU5ZRSZlbmNyeXB0ZWRBZElkPUEwOTU5MjYzMzhIMFJDSDJGOTJEUCZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

[ar15barrels]

But not necessarily safe in your rifle.

That's not what he specifically asked.
He didn't ask for a solution either.

My concern is the added pressure that will be created from the additional depth. Should I be concerned? Not sure how much extra pressure this would create.

I answered what he specifically asked.
It's up to him to decide what to do with the info.

[papafloyd]

Thank you all for the information, I really appreciate it. I do need to and will add a bullet puller to my equipment, I should've done this already as I have ruined loads before making some misloads inert. Randall Rausch that info is exactly what I was looking for and extremely helpful, thanks again. It doesn't take a lot to increase that pressure! With the pressure approaching the max. and not knowing how many times this brass has been reloaded I will probably be safe and just pull the bullets.

Thank you all for your help.

[pacrat]

That's not what he specifically asked.
He didn't ask for a solution either.

I answered what he specifically asked.
It's up to him to decide what to do with the info.

My concern is the added pressure that will be created from the additional depth. Should I be concerned? Not sure how much extra pressure this would create. Thanks for any suggestions offered.

You did answer the underlined, and did so in a very concise and accurate posting.

I contend that the bolded in OP's quote. Went unaddressed by you.

And since he asked, I answered. Especially in light of these quotes;

"To be honest I am a beginner that hasn't reloaded in approx. 2yrs" ...AND... "I'm hoping someone with more experience can give me some direction".

And you are correct about him deciding what to do. Over the years, I've found that easy options, borne of experience, suggested as a means to address any concerns one "might have", are typically received with appreciation. Such as this;

Thank you all for the information, I really appreciate it.

OP, you're more than welcome Sir.

[Fat Albert]

no problem

This one of the reasons that God invented Impact Bullet Pullers. Just pound the bullet out till it is longer than the lenght you want and put it back in to the seater. When people ask me about reloading and what they need to get , I tell them to get a stuck case remover and a Impact Bullet Puller ---"before"--- they buy any other reloading equipment.

[Fat Albert]

QL burn rate factor

Ar15; In QL the BA# for fps and psi are never the same. If you enter the Hod load data for the 180 Sp speer bullet @ 14.1gr and it comes out 1624fps and 36.***. But Hod shows that the speed is 1624 but the psi is 44500psi. That because the fps Ba is 7300 BUT the PSI Ba is 8350. When you enter the 178(@ 2.210" into the program with the with a Ba of 7300 you get 1625fps and when you enter the Ba of 8350 the psi is 48,178. Using the 2 Ba's with the 178 seated @ 2.1" it comes out @ 1719fps and *****60,276PSI****. I hope this helps you. If you look @ the Hod max load there are 2 different BA # that are not the same as the min load. Some times they go up and some time they go down.

[ar15barrels]

Ar15; In QL the BA# for fps and psi are never the same. If you enter the Hod load data for the 180 Sp speer bullet @ 14.1gr and it comes out 1624fps and 36.***. But Hod shows that the speed is 1624 but the psi is 44500psi. That because the fps Ba is 7300 BUT the PSI Ba is 8350. When you enter the 178(@ 2.210" into the program with the with a Ba of 7300 you get 1625fps and when you enter the Ba of 8350 the psi is 48,178. Using the 2 Ba's with the 178 seated @ 2.1" it comes out @ 1719fps and *****60,276PSI****. I hope this helps you. If you look @ the Hod max load there are 2 different BA # that are not the same as the min load. Some times they go up and some time they go down.

BA changes with pressure.
That's what the progressivity factor is for.