Bullets tumble upon exit from barrel.

[ZT1995]

Greetings all, first post and I am new to Lee-Enfields so please be kind 😁 I recently purchased a No. 4 Mk 1/2 and had my first range session yesterday. I fired a total of 60 rounds of PPU 174gr FMJ BT at 50 yards. I am by no means an excellent marksman, but only about 30 rounds landed on the torso-sized paper. Those that did make it onto the target appear to be tumbling as the holes are in the shape of the profile of the bullet. I’m looking for advice for what my next step should be. From what I’ve gathered reading other threads, my options are:
1. Try to find production ammo that uses flat-based bullets. I have read other posts suggesting this could work better with the 2-groove rifling in my barrel.
2. Re-crown the barrel (which doesn’t look terrible to my amateur eye).
3. Load my own ammo (which I was hoping to not have to do, but would be open to starting).
4. Re-barrel the rifle, which seems like it would cost more than I paid for the rifle itself ($400).

Any and all advice is welcome, thank you!

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