I use one of these: https://www.cedhk.com/ced-m2-chronograph

However, mine isn't one of the newer chronographs they now offer. I think I bought mine in about 2005 but not sure. I have had very good luck with it and their customer support has been great. JMHO I don't use a lead sled, never could see a use for it. I shoot .338 Win Mag a lot and .375 Ruger is my most used hunting rifle. The CED works very well for everything and I also shoot a wide variety of varmint rifles. Works very well for everything, .223, .22-250 AI on up.

Someday someone may kill you with your own gun, but they should have to beat you to death with it because it is empty.