I've been using mine for years now with nary a peep from the line judges.  To DQ a Krag with a charger, you would also have to do the same with a K-31, which uses a similar charger.  I've been making them for over 4 years, so with all that I've sold, there are several dozen being used in matches around the country... and I've never heard of a problem.  The rule is to rapidly reload five rounds, but the rule book has no provisions for how you facilitate that reload.

FWIW, I have a friend who increased his score with his 1896 from the 250s, to the 290s after he started using the chargers I made for him.  This man WINS matches with his Krag!!!