223 Rem brass by Topp Brass in 250 / bag. These are once fired military LC brass that are completely reconditioned and primed with # 400 primers. Overall length is 1.750" the other specs are also given on the packages. Topp Brass has many different brass types but I've had good success with these. I have 4 x 250 bags of this brass plus 39 more for 1039 ready to be reloaded to your specific specs.