The red border rate is probably a bit higher than 1 in 10 in all honesty and its probably closer to a 2 to 1 shotty to sword than anything but its rather unlikely for someone to get 3 things to 1 given that both things are weighted evenly. Thatd be like getting 30 heads and 10 tails when flipping a coin 40 times not impossible given any odds but still a larger outlier than should be practically possible which makes me think they weighted shottys more for who knows what reason.