Check your magazine spring isn't installed around the wrong way. This typically makes the rear stick up to far and the nose to dive and jam though so I doubt this also quite likely it's not even possible for your rifle to do so.
Check your follower isn't getting snagged in the mag box, burrs, nicks, rough patches.
Check your rounds aren't slightly too long for the internal mag box and getting caught up. Whether or not they are full length sized won't really matter but too long and getting fetched up will lock things up.
After that doesn't fix it (because I'm guessing it's not one of these). It's likely your mag spring has gotten weak, this does happen. Find a replacement, doesn't have to be rifle specific, anything of a similar action size can often be modified to suit quite easily but best to get as close as possible/ direct swap if you can.
Sometimes you can get away with giving them a stretch but this is generally a short term measure as you have to stretch it past it's elastic capabilities and it'll either bend back in short order or get work hardened and snap.
Controlled round feed is excellent when it works. Can be a right pain when it doesn't.
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