It is a drop in fot for a Stagagerd feed magazine.
Are you useing it for a centerfeed, or a staggard feed?
Did you place it inside the magazine biox, with the follower on the bottom?
Are you trying to load off the follower with a hollow point bullet?
Common problem with Savage chambers and the 223 and 204 attempting to get them to load hollow point bullets, the just hit the back of the barrel, the only way to fix this problem is to have a AR-15 style ramp cut into the back of the barrel.
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