The Ultrasonic Cleaner SR4270 has a bigger capacity and works great for larger quantities of cases or for large gun parts such as 1911 slides and frames. The ultrasonic cleaning action removes carbon residues from cases or gun parts. It fits about 360 .223R. cases or 180 .308W. cases. Capacity. 2.6 Quarts. How SmartReloader Ultrasonic Cleaners Work? When there are teeny, tiny little particles that are impossible to remove by other methods of cleaning then a SmartReloader ultrasonic cleaner is used. Keep in mind however that ultrasonic cleaners are not used to actually clean dirty items but rather to remove tiny particles that are impossible to remove any other way. The item must be cleaned first and then it will be ready for an ultrasonic cleaner. The SmartReloader Ultrasonic Cleaners use cavitations, which occurs when tiny bubbles form and collapse violently in a cleaning solution. The constantly forming and popping bubbles serves as a scrubbing agent that in turn cleans all parts, hidden and exterior, of the article submerged in the solution. There are many benefits of ultrasonic cleaning that include speed, precision, and consistency. First of all, speed is important because ultrasonic cleaning allows many things to be cleaned without being taken apart. Precision is another benefit and an important one. The SmartReloader Ultrasonic Cleaners work great because it can get in every little crevice, crack, and space to clean it properly. The final benefit is consistency and the SmartReloader Ultrasonic Cleaners ranks up there because it provides an unparalleled cleaning every single time without fail for all pieces big or little, complex, or simple.