IMR Powder 4198 Rifle Powder is popular for reloading a variety of cartridges, including the .450 Marlin, .221 Fireball, and .222 Remington. For people who enjoy using small-bore cartridges for varmint hunting, this powder boasts a long list of benefits. The powder is extremely fast burning, smokeless, and easy to meter. In addition, this powder is specially designed to handle extreme hot and cold weather conditions, making it great for field shooting. There is also a strong guarantee from the company based on the degree of excellence, boosting overall customer confidence.