I bought all 30 of these at a yard sale as they were different and I thought the price was right. I've seen lots of shot shells for different calibers in revolvers but nothing like this. The chamber in my Bikal single shot .410 shotgun is 3" but I hesitate shooting them as they fit loosely and I want to keep my head on my shoulder and I love the shotgun. The head-stamp appears modern but the capsules look much older evidently from age and/or storage. Can anyone give me guidance as to what these shotshells were designed to be fired in and secondly, since my shotgun has a 3" chamber could they SAFELY be fired in my shotgun even though loose fitting? Thank you for your input and if I can be emailed at [email protected] I tried a second picture but it wouldn't upload. the headstamp is R-P .44 Rem Mag. I'm not showing any picture on my post. The cartridge with the capsule measures 2-1/4" in length.