Bren Semi-auto bullet set-back

[jeff_b]

Any guess on what might be the cause of bullet set-back on my old Bren LMG? It happens with all different ammo types. See photos (if I attached them correctly!).

Attachment 96748Attachment 96749

Information

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[Brit plumber]

When you say all bullet types, does that include FMJ? Does it include standard service ball? Different mags? Is it a rewat/reweld?

[ActionYobbo]

They were not made to use soft point bullets.
Check your feed ramps and also check the feed lips on your magazine.
With a FMJ the tip should line up with the groove in the feed ramp and be slighty lower

[MGMike]

Clearly the round is stubbing while trying to feed. Are you positive that the mag is correctly loaded (i.e., each cartridge rim ahead of the one below)?

[Peter Laidler]

I'd be helpful to know what it is stubbing against. Looking at the bullet end on might give us a clue

[Paul S.]

Are these reloaded rounds, and if so, have they been properly crimped? What is causing the stubbing really is the big question - and is the most likely cause.

[Bruce_in_Oz]

Soft-pointed bullets: first problem.

That said, we need to know exactly where the soft tip is striking.

If you must reload, you need to use a recipe that closely matches the:

Overall cartridge length,

projectile profile,

projectile WEIGHT

and muzzle velocity

of the good-old Mk7 ball ammo around which these .303 cal guns were built.

Does this happen with ALL mags or just one / a couple?

Check your magazine "filling' technique and the mag springs.

If it is a "re-weld", check the guide surfaces leading from the mag to the chamber.

Was it once one of the Canadian-made Brens in 7.92 x 57? If so, it will likely have different cartridge feed behaviour from a "native" .303 gun.

I haven't touched a Bren for a few years, so others should chip in with additions / corrections to my little list.

[Brit plumber]

I don’t think we’ll hear from the OP again, he last logged on the day after his post having had a number of replies and not responding further.

[browningautorifle]

I don’t think we’ll hear from the OP again

Typical...

[Peter Laidler]

The Bren forum is notorious for such, er......., naughtiness!