A bore saver or bore guide for a Ruger #1 cal 22-250. MidwayUSA doesn't carry them. I e-mailed them to make sure.

If you want the best, get a Lucas..

http://www.6mmbr.com/catalog/item/1433308/954882.htm

Sinclair has delrins for less $$...

http://www.sinclairintl.com/cgi-bin/category.cgi?category=search&item=RG5X&type=store

Thanks. Will order one.

A bore saver or bore guide for a Ruger #1 cal 22-250. MidwayUSA doesn't carry them. I e-mailed them to make sure.
Sinclare reloading company has them.