My son uses them with his ex-mil 8x57 for a fast reload. They are very efficient.

My 9.3x62 has the rear charger clip guide ground down to facilitate the fitting of Warne scope bases. I regularly remove these bases and then fit shortened screws so I can use the Express sights. The cut down guide doesn't provide as much lateral stability to a charger clip, so aren't much use for a quick reload. It is just as quick to thumb in a hand full or rounds.

For a designated, express sighted, magazine rifle I'd suggest leaving the charger guide intact.