Quickload calculations for double charge!

[andym79]

Hi guys,

not that I ever plan on doing it but I would like to know the likely pressure produced from double charging one of my loads.

I previously used a load in my 30-30 that couldn't be double charged, but pursuing accuracy has lead me to a load which makes it possible. The same is true of my 6.5 x 55.

To attempt, to exclude a double charge, I weigh each case empty, charge, weigh and then seat the bullet. After I have finished loading a batch, /I place a dummy round on the scales and weigh each round against it.

If some body who has quick-load, could please run some simulation for me it would be greatly appreciated! I want to determine if I am playing with fire, and how hot that fire is!

The loads (if doubled) are as follows:

30-30 165 grain cast RNFP seating depth .475", OAL 2.510", no filler H4227 34 grains
As above with H4198 32 grains.

6.5 X 55 140 grain cast, GC, seating depth .270", OAL 3.000", no filler, H4227 34 grains.
As above with H4198 32 grains.

Thanks

 

[steve4102]

30-30 h 4227

 +00.0  117    34.00   2011    1481 [b] 124796[/b]  38542    100.0    0.304  !dangerous load-do not use!

30-30 h 4198.

 +00.0  108    32.00   1706    1066   [b]77853[/b]  34507     90.6    0.382  !dangerous load-do not use!

 

[hentown]

Doesn't 34 grains really fill up the case? Can't you see the powder, if you look into the case after charging?

 

[gahunter12]

I agree with hentown. I look in EVERY case before placing the bullet, even on my progressive press. I always intentionally double charge a new case/powder combo just to get a visual of what to look for, then dump the powder back in my powder measure. When you start talking about fast powders with low charges, even a extra .5gr-1gr could mean the difference between good to go, and a Kaboom! I don't think weighing completed rounds is a viable way to determine a over charge. Maybe a double charge, but not a overcharge by .5gr-2gr when the difference in weight of the other components could vary as much also.

 

[andym79]

No, the 30-30 and 6.5 case will charge around 2.5 times before reaching the bullet base with these two powders! I actually did it to see.

I understand what you are saying about an over charge, but I have around a 5 grain margin till the load exceeds 'max load'