That there, is some serious fire forming!! 
I'd think you quite lucky that nothing worse happened and as already mentioned I'd highly recommend you do not fire any more of those incorrect rounds in your rifle.
I would also call the manager or owner of that store and tell them of their terrible mistake. I'd further insist on a brand new box of the correct ammo to replace the incorrect ammo which might have caused you some serious harm.
I'd think you quite lucky that nothing worse happened and as already mentioned I'd highly recommend you do not fire any more of those incorrect rounds in your rifle.I would also call the manager or owner of that store and tell them of their terrible mistake. I'd further insist on a brand new box of the correct ammo to replace the incorrect ammo which might have caused you some serious harm.
