Never heard or saw Browning brand ammo before. Probably some collector value. Of course it may be worth a case of beer or two on bets. I have some 22 rf ammo in blue and white boxes labeled Smith and Wesson and the bottoms of the cases are stamped S&W. Won two cases of beer with those of course the other guy already had one or two too many when he insisted there was no such thing and made the bet.
I would use them. Couple years ago I used a box of Federal magnum shotshells my grandfather gave me for a 20 gauge. They had a picture of a duck on the box, and had lead shot. I foget teh dram eqiv of the charge, but I do recaul they we 1 1/4 oz of shot. Those darn things kicked harder than my 12 gauge.
While cleaning out my dads house in 2008 I found a few full boxes of Remington 12 ga high brass marked "Remington Express New Plastic".... I think these were from the 1960's. They worked just fine. Maybe they were valuable to collectors but the rabbits and phesants did not notice.