IMR 7383 Military Surplus Gun Powder For Sale IMR 7383 Military Surplus Powder is a specialized triple-base propellant combining nitrocellulose, nitroglycerin, and nitroguanidine, designed initially for military use in .50 caliber spotter and tracer ammunition. This powder is valued for its flashless ignition, which allows discreet firing without visible muzzle flash, making it ideal for military spotting rifles. Its high energy and slow burn rate provide consistent velocity and excellent ballistic performance in large rifle cartridges, but it demands cautious load development because of its potential for abrupt high-pressure spikes. IMR 7383 performs best at charge densities between 85% and 105%, with erratic or unsafe pressures occurring outside this range. Knowledgeable reloaders appreciate its unique characteristics, though it requires strict adherence to reliable load data to ensure safety and optimal performance. This military surplus powder is suitable for experienced shooters looking for a cost-effective, authentic powder that delivers strong performance for .50 caliber and similar heavy rifle cartridges. Safe reloading practices and precise measurement are paramount when using IMR 7383. Ideal for reloaders seeking military-grade triple-base powder with minimal muzzle flash and consistent power, IMR 7383 remains a distinguished choice in surplus powder markets. Specifications Product Information Quantity  1 – 8 Pounds Delivery Information Shipping Weight 1.00 – 8.000 Pounds DOT-Regulated Yes HazMat Product Yes   WARNING: This product can expose you to N-Nitrosodiphenylamine, which is known to the State of California to cause cancer, and Di-n-butyl phthalate (DBP) or Lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to – www.P65Warnings.ca.gov.