11/16 - Powder & Cartridge Calculations
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11/16 - Powder & Cartridge Calculations
One of my favorite plinking loads for the 357 Mag with a 158 gr bullet uses 5 gr Titegroup. How many rounds will I be able to load with 1 lb. of powder?
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Re: 11/16 - Powder & Cartridge Calculations
Simple divide 5 into 7000 or 1400 loads.
7000 is the number of grains in a pound.
you can do the same with lead 7000 divided by 158 is 44.303797468 bullets per pound.
7000 is the number of grains in a pound.
you can do the same with lead 7000 divided by 158 is 44.303797468 bullets per pound.
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Re: 11/16 - Powder & Cartridge Calculations
Okay that was pretty quick. How about this? With the bullet seated, how much space (%) does 5-grains of Titegroup occupy of the useful case capacity?
We would need okie44 to give us the overall length of the bullet along with the diameter it is sized to plus the cartridge OAL he is using. I think we could go with the 357 Mag's standard H2O capacity of 25.60 grains and length of 1.290" and the Titegroup's VMD spec of .0848.
Heck, might as well figure out the space 5-grains occupies of the entire case capacity as well so we can see if that charge will overflow if doubled helping us to prevent a KABOOM.
I'll be back in 6 days
We would need okie44 to give us the overall length of the bullet along with the diameter it is sized to plus the cartridge OAL he is using. I think we could go with the 357 Mag's standard H2O capacity of 25.60 grains and length of 1.290" and the Titegroup's VMD spec of .0848.
Heck, might as well figure out the space 5-grains occupies of the entire case capacity as well so we can see if that charge will overflow if doubled helping us to prevent a KABOOM.
I'll be back in 6 days
Michael
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Re: 11/16 - Powder & Cartridge Calculations
Ops that just got out of control But would like to know how to figure that all out.
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Re: 11/16 - Powder & Cartridge Calculations
As an aside what bullet is that? For no gas check I like the looks of it, as you said for plinking. Nice lube groove.
Make smoke,
Make smoke,
Curt.......makin' smoke and raising my carbon foot print one cartridge at a time
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Re: 11/16 - Powder & Cartridge Calculations
Bullet length.664" Loaded to 1.58" sized .359
The bullet is a Lyman 358665. Lee has a similar mold 358-158 although the Lee appears to have a more pronounced bevel base than the Lyman. I've been thinking of getting a six cavity Lee to speed up production.
The bullet is a Lyman 358665. Lee has a similar mold 358-158 although the Lee appears to have a more pronounced bevel base than the Lyman. I've been thinking of getting a six cavity Lee to speed up production.
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Re: 11/16 - Powder & Cartridge Calculations
Okay... until we get to the specifics of the bullet and cartridge overall length, let's look at an empty case vs. the powder charge.
All it takes is the volume of powder (in cubic centimeters) divided by the volume available in the empty case.
1 cc of water weighs 15.432 grains, that is the average of typical tap water but if you really want to get into this, specific waters have specific weights. Anyway...
With the given capacity of H2O being 25.6 grains, the math is:
25.6/15.432= 1.66 cc
A 357 Mag case filled with tap water, flat across the rim, would hold 1.66 cc of water by volume.
Lee has made the powder stuff pretty simple by defining VMD that math is:
VMD times the charge in grains = cc
.0848x5= .42 cc
The rest is easy math:
charge divided by full case capacity = filled (%)
.42/1.66= .25
The case is filled only 25%[hr][hr]The rest is going to be easy if we treat the bullet as a cylinder and determine the volume of the cylinder occupying case space in cc. We take that away from the 1.66 cc available in the case. With that solved we divide the charge cc (.42) buy this result to see the powder density of the load.
All it takes is the volume of powder (in cubic centimeters) divided by the volume available in the empty case.
1 cc of water weighs 15.432 grains, that is the average of typical tap water but if you really want to get into this, specific waters have specific weights. Anyway...
With the given capacity of H2O being 25.6 grains, the math is:
25.6/15.432= 1.66 cc
A 357 Mag case filled with tap water, flat across the rim, would hold 1.66 cc of water by volume.
Lee has made the powder stuff pretty simple by defining VMD that math is:
VMD times the charge in grains = cc
.0848x5= .42 cc
The rest is easy math:
charge divided by full case capacity = filled (%)
.42/1.66= .25
The case is filled only 25%[hr][hr]The rest is going to be easy if we treat the bullet as a cylinder and determine the volume of the cylinder occupying case space in cc. We take that away from the 1.66 cc available in the case. With that solved we divide the charge cc (.42) buy this result to see the powder density of the load.
Michael
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Re: 11/16 - Powder & Cartridge Calculations
The math of figuring out cc volume occupied by the bullet inside the case (the cylinder) is:
(diameter divided by 2) times ((diameter divided by 2) times the length seated (inches) times 3.14159 times 16.387064 = volume in cc.
(diameter divided by 2) times ((diameter divided by 2) times the length seated (inches) times 3.14159 times 16.387064 = volume in cc.
Michael
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Re: 11/16 - Powder & Cartridge Calculations
I have a Lee 358158 in two holes (I think).
I like the math. I like using pi to that many digits. (As an aside I had a kid in one of my big time math classes that had pi memorized to over 100 digits because it was on a banner around the classroom and he paid little attention to lessons).
I've been helped by Okie more than just about anyone but come on dude. Use 2400 and you can't overcharge one enough to blow anything up. Haha. Sort of. Then again, 2400 requires a lot more of a powder very tough to find.
Okie, do you have to muzzle up shake your guns before you shoot 'em?
I like the math. I like using pi to that many digits. (As an aside I had a kid in one of my big time math classes that had pi memorized to over 100 digits because it was on a banner around the classroom and he paid little attention to lessons).
I've been helped by Okie more than just about anyone but come on dude. Use 2400 and you can't overcharge one enough to blow anything up. Haha. Sort of. Then again, 2400 requires a lot more of a powder very tough to find.
Okie, do you have to muzzle up shake your guns before you shoot 'em?
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Re: 11/16 - Powder & Cartridge Calculations
GasGuzzler wrote:
Okie, do you have to muzzle up shake your guns before you shoot 'em?
I don't do anything special. Titegroup is not real finicky about position. It will attack the plastic tube on the powder hopper!
“Good judgement is the result of experience and experience the result of bad judgement.”
― Mark Twain
― Mark Twain