Gunthorp Ammunition Specifications

Energy relates to how much stored up work can be done and is based upon the mass of the projectile divided by two and its velocity squared. Momentum relates to the duration and force required to start or to stop an object and is based upon mass and simple velocity. Ammunition manufacturers use energy to describe the power of a cartridge. US Army field studies slaughtering cattle indicate that power may be more closely related to momentum. The answer may lie somewhere in the middle. The concept of stopping power adds more complexity, because target anatomy and shot placement may be more important than anything else. Firepower can be demonstrated by a .50 cal machine gun burst, but unless the target is hit, a well placed .22 would have more stopping power. In a gunfight, the successful outcome depends most upon the mindset developed by positive attitude and preparation, and skill from practicing with reliable equipment.

The formula multiplies the bullet’s base area in square inches times its weight in grains times its velocity in feet per second, then divides by an arbitrary number (1000) to get a result which can be compared easily.

You can calculate the energy of any bullet by multiplying its weight in grains by the velocity factor below.

Load Details
Load No.			Caliber									Primer No.					Bullet Weight Grains / Grams			Bullet style
AE380AP			380 Auto (9x17mm Short)									100					95 / 6.15			FMJ
P40HS1			40 S&W									100					180 / 11.66			Hydra-Shok
AE40R1			40 S&W									200					180 / 11.66			FMJ
P45HS1			45 Auto									150					230 / 14.9			Hydra-Shok
AE45A			45 Auto									150					230 / 14.9			FMJ
P9HS2			9mm Luger (9x19mm)									200					147 / 9.52			Hydra-Shok
AE9FP			9mm Luger (9x19mm)									200					147 / 9.52			FMJ FN
P38HS1	+P		38 Special									100					129 / 8.36			Hydra-Shok
PD380HS1 H			380 Auto (9x17mm Short)									100					90 / 5.83			Hydra-Shok
P357HS1			357 Magnum									100					158 / 10.23			Hydra-Shok
AE357A			357 Magnum									100					158 / 10.23			JSP
AE38K			38 Special									100					130 / 8.43			FMJ
Velocity in Feet Per Second (To Nearest 10 FPS)
Load No.				Muzzle			25 Yds				50 Yds			75 Yds				100 Yds
AE380AP				960			910				870			830				790
P40HS1				990			960				930			910				890
AE40R1				990			960				940			910				890
P45HS1				850			830				810			790				770
AE45A				850			830				810			790				770
P9HS2				1000			960				920			890				860
AE9FP				960			930				910			890				870
P38HS1				950			930				910			890				870
PD380HS1 H				1000			940				890			840				800
P357HS1				1240			1160				1100			1060				1020
AE357A				1240			1160				1100			1060				1020
AE38K				950			920				890			870				840
Energy in Foot Pounds (To Nearest 5 Foot-Pounds)
Load No.		Muzzle			25 Yds			50 Yds	75 Yds				100 Yds			Test Barrel Length Inches
AE380AP		190			175			160	145				130			3 3/4
P40HS1		390			365			345	330				315			4
AE40R1		390			370			350	330				315			4
P45HS1		370			350			335	320				305			5
AE45A		370			350			335	320				305			5
P9HS2		325			300			275	260				240			4
AE9FP		295			280			270	260				250			4
P38HS1		255			245			235	225				215			4-V
PD380HS1 H		200			175			160	140				130			3 3/4
P357HS1		535			475			430	395				365			4-V
AE357A		535			475			430	395				365			4-V
AE38K		260			245			230	215				205			4-V
Mid-Range Trajectory
Load No.						25 Yds				50 Yds					75 Yds				100 Yds
AE380AP						0.3				1.3					3.1				5.8
P40HS1						0.3				1.2					2.8				5
AE40R1						0.3				1.2					2.7				5
P45HS1						0.4				1.6					3.6				6.6
AE45A						0.4				1.6					3.6				6.6
P9HS2						0.3				1.2					2.8				5.1
AE9FP						0.3				1.3					2.9				5.3
P38HS1						0.3				1.3					2.9				5.3
PD380HS1 H						0.3				1.2					2.9				5.5
P357HS1						0.2				0.8					1.9				3.5
AE357A						0.2				0.8					1				3.5
AE38K						0.3				1.3					3				5.5