grain question
grain is the weight of the bullet? how are the loads rated?
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ok not all once[:)] 0 -
ridewot,
It's Sunday morning and the population of the forums is generally smaller and the answers a little slower because most of the folks have family obligations and church to attend. 8 minutes is not a lot time to wait for an answer...
"grain is the weight of the bullet? how are the loads rated?"
I think there may be a little confusion on our part as to what you're looking for in an answer.
Powder is weighed using grains also.
A little more explanation would get us going in the right direction.
Thanks!
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There are 7000 grains in an Avroidupois pound.
It is a lot easier to discuss a 230 grain bullet and 5 grains of powder (common for .45 ACP) than to say the bullet weighs .0328571 pound and is propelled by .0007142 pound of powder.
Loads are "rated" by bullet weight and muzzle velocity. That .45 ACP bullet is doing about 850 feet per second; abbreviated 230 gr at 850 fps.
There are calculated ratings based in physics like (kinetic) energy and momentum and various other numbers like Taylor Knock Out made up to make the user's favorite caliber look better.0 -
so the smaller the grain the more fps 0 -
Not sure what you mean by "how are loads rated. Not sure what the real question is, what is it that you are actually looking to find out.
A grain is a measurement of weight as stated. There are 7000 grains per pound. This really has nothing to do with a "rating" is just a way to measure how much of what is in the round. I can not think of a better example but if you are baking a cake you need to know how much of what to add to make it turn out right.
A lighter bullet in the same case with the same amount of the same powder should have a higher FPS.
Then there is also ratings of FPS and energy. Different bullet preform differently depending on design and speed.0 -
quote:Originally posted by ridewot
so the smaller the grain the more fps
No, not necessarily, if you are talking about hand loading you can down load a light bullet to be slower than a heavy bullet. However all things being equal, within acceptable pressure limits a lighter bullet will be faster than a heavier bullet. It will also tend to slow down faster.
Grain weight is used in two places. It is used for the weight of the bullet and is the measurement used for the weight of the powder charge in the cartridge.0 -
You are going to have to let us know what you are REALLY asking! Bullet weight= grains! Powder charge= grains! 0 -
In a given cartridge a lighter bullet can be safely pushed faster than a heavier bullet. 0 -
You have a bunch of correct information here in previous posts. Since the bullet and powder are weighed by the same unit in grains, here is a breif synopsis...
Bullet weight
lighter=faster, and heavier=slower
Powder weight
lighter=slower
heavier=faster
Those are general summaries that apply to both sides of the pond, as on the other side of the pond, there are a lot of places that measure in grams, not grains. The above will apply to both.
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ridewot,
Since we've now had time to jump on you through the day[}:)][:D]
I'll give you my version. The bullet and the powder are given in grains of weight which amounts to 1/7000th of a pound per grain. The kinetic energy released when the bullet is fired gives you a known weight of bullet moving at a given velocity in feet per second. If you were to measure the force of a bullet at the muzzle of say a .45 ACP, you would get something like this, 400 Foot LBs. That is as much force to take one pound 400 ft. or 400 lbs. one foot. There are certain calculations and standard conditions included that prevent that from happening as you would think. But that's the gist of it.
So, what you have is the known components before firing and how much energy is about to be expended and how much energy is at work after firing. Get it??[:D]0
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