My ar-15 m4 carbine only likes metal case ammo double star m-4?

it only seems to like brown bear or wolf ammo at first it would shoot anything but now brass case reloads seem to stick in chamber i have to break it down and kinda pry bolt back some to get round out it use to love hotshot and federal white box and red box ,,,i clean pretty reg but its hard to get m-4 feed ramps... show more it only seems to like brown bear or wolf ammo at first it would shoot anything but now brass case reloads seem to stick in chamber i have to break it down and kinda pry bolt back some to get round out it use to love hotshot and federal white box and red box ,,,i clean pretty reg but its hard to get m-4 feed ramps good ,,,
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