yeoman

They do! both Harvester and MMP make a EZ loading 50 cal sabot, Harvester also makes a 44 cal ez loader...

Harvesters are called "crush ribs" and MMP's are called HPH-3p-EZ load. MMP also makes a HPH-24 sabot that fits most new guns very well even the tight TC's and new Green Mountain barrels...

I prefer the 3p-EZ to the Harvester - it is strictly a personal thing.. when I was testing them got higher velocities with them and excellent accuracy..