I llke the Tipton Universal Guide (Tipton Universal Bore Guide
If offers a variety of tips (small, .17-.24; medium, 25-.30; and large, for .30. They seal well in the chamber (a slight push on the rear while aligning and tightening the stop collar lock is all it takes to create a pretty good seal)
Because it's universal in design I don't have to have a collection of specific "o" ring seal guides (like I formerly did) to cover every caliber rifle I own.
I have a great woman, fantastic kids, a warm place to sleep and an accurate rifle. Life is good ..............
Hunter Safety Instructor - Rifle/Pistol Marksmanship Instructor
American riflemans triad - God, guts and guns. It built America and it'll preserve America. Abandon one and you lose them all.