Impossible to answer without knowing Velocity and what your end state is.
Grains refer to the bullets weight. A 40 grain bullet weighs four grains more than a 36 grain bullet. It's a little heavier, that's all.
About 2,200 fps for a 30 grain.
Either can travel faster than the other depending on the load.
The velocity will vary depending on the load of the cartridge. Factory loaded 250 grain .44 magnums are rated at 1760 fps from a Marlin lever action rifle with a 20 inch bbl. I would expect another 100 fps from a lighter, 180 gr bullet. Your best answer may come from Marlin- 1-800-544-8892 is Customer Service.
The velocity of a bullet is dependent on many factors. The amount and type of propellant affect velocity, as does the barrel length. The Springfield 30-06 with a 180 grain bullet can have a velocity of 820 meters per second based on a 60 centimeter barrel - again dependent on powder charge and type.
A 150 grain bullet shot from a 308 will start dropping the fraction of a second it leaves the barrel.
Grain refers to the weight of the bullet when measured on a powder scale.
The weight of the bullet. They can range from 25 grain (Small rifles) to over 400 grain for big game.
Grains refer to the bullets weight. A 40 grain bullet weighs four grains more than a 36 grain bullet. It's a little heavier, that's all.
Grain refers to the weight of the bullet when measured on a powder scale.
The standard military .50 BMG round uses a 750-grain bullet which exits the muzzle of the gun at around 2,700 fps.
The reference to grains means the weight of the bullet.
The heaviest bullet in my reloading manuals for the .380 is a 120 grain cast bullet.
The muzzle velocity of a Winchester .30-30 varies depending on the load and the bullet, but we can ball park things a bit. With a "standard" load and a 110 grain bullet, it's about 2,690 fps (feet per second). For a 130 grain bullet, about 2,500 fps. A 150 grain bullet cuts it to about 2,400 fps. With the 170 grain bullet, it drops to about 2,200 fps.
.408 Supersonic Chey-Tac round. It uses a 419-grain or 305-grain cartridge, and uses a Spitzer bullet
The grains of a bullet, be it black powder or not , is the weight of the bullet. Lets say you have a .50 caliber rifle, and fire a 250 grain bullet at a target and hit dead center. Then fire a 300 grain bullet, that bullet will hit slightly lower on the target , but will have more force or stopping power" due to the weight. So the higher the grain the heaver the bullet.
This means the weight of the bullet itself. A common misunderstanding is that the higher the grain the better. Which is not true. A larger grain is slower than a smaller grain. Find which grain of bullet shoots the most accurate out of your gun. There are 7,000 grains to a pound.