I have a Marbles No. 170 auxillary cartridge for a 250-3000 rifle. This allows you to shoot a 25 acp cartridge in your rifle. I bought this here about 8-10 years ago in the original Marbles pkg and have never used it. These will work in a savage 99, or bolt action rifle like a Ruger 77 or Remington 700. $45 shipped. First public "I'll take it" trumps PM's. Thanks.