with certain powders-h110 is one of them-you need load density. in other words, very little empty space in the case behind the bullet.
reloading isnt to be taken lightly, it is very dangerous to just grab stuff off your bench and throw it together. FOLLOW YOUR MANUALS TO THE LETTER! DO NOT ASSUME A THING!
consider yourself lucky. this is how bad stories start. learn from it, and be very careful what you put together from now on.