I am a Saiga long gun fan and I own several. My .410 cycles great but it is a little finicky on the length of the shell. I e-mailed SGAmmo about a particular brand of 000 that they have in stock to see if they could give me an overall length measurement. Sam actually sent me a couple of great pictures with the shells laying beside a tape measure to eliminate any guess work. That is what customer service is supposed to look like.