I have three. A Stainless Stalker in .300 Winchester with the CR device, A Low Wall in .22 Hornet, and a Varmint in 22-250 with the CR.
I forgot to list the why. Accuracy & reliability. I have taken antelope out to 483 yds. with the .300. I have a load that uses an overall length that is too long for the magazine so I single load it. With antelope it does not matter. This load consistently shoots 3-shot groups under .200 at 100 yds. When I shoot at something I know I am going to hit it. It shoots several factory 180 gr. bullets into 1/2". The varmint has shot groups at 200 yds. that were 1/4". The Low Wall groups at 1/2" for 3 shot groups.