I was doing a US Arms competition Thursday and in 1 stage my previously rock solid Daniel Defense with a few thousand rounds through it had a misfeed. I rack the charging handle to clear it and another round feeds in partially. I eject the magazine and both rounds are partially in chamber. I put my finger up the mag well and cleared both out. Obviously that stage was fckd but wondering if that was the best way to clear the jam? It was with M193 ammo and gen 3 Magpul magazine. The rifle is all factory DD. This was the first time I've seen this type of jam in years of Marines and shooting. Wondering what caused it and what's the best way to clear it. Thanks