Where do you hear four clicks out for head space. It should be set at 2 clicks out from lock up. Heat expansion on the barrel and trunion can cause the gun to run rough and sporadic so you can always turn it out one more click and that should smooth the gun out. Four clicks out is overly excessive. Check your Breach lock block, Check your trigger adjustment lock nut if its tight. Then Set your head space out side the gun at two clicks out, There is a video on the Tube how to find lock up of your barrel and extension and bolt out side the gun. Put your internals in. Then set your timing at no more than .072-.074 with a nice firm medium pull of the trigger, not a hard pull. Now you are good to recheck your head spacing inside the gun two clicks out from lock up. If you are still splitting cases try and new barrel first and then a new bolt. Compare firing pins used for squared or sharp points or worn short tips. Recheck timing anytime you replace ANY of the internal components including the barrel or even the sear or beach block. If the cases continue to split its an ammo problem. If the primers continue to protrude, see if they protrude in another gun. Split cases equal blown top covers and swelled side plates eventually. As long as the protruding primers are not causing extraction issues or hang ups, run it. If you are rupturing the primers don't run it and clean your firing pin area good. If this ammo is just a little too hot and its beating your gun up you could always try running the ammo out of a well worn or shot out barrel for less back pressure and see if that makes any difference. If it does help and you think its hot then I have one last Browning trick. I don't have a 1919 auto but a 1917 but if it were me and the ammo was just to hot and I had a lot of this ammo I would try reaming out a spare booster as a cheap fix but that is just me. If your primers are still falling out then sell it cheap to the last guy who ripped you off. Hahahahahaha Wait a minute, who was the last guy you ripped off??? Just kidding.
If you shoot polymer or especially lacquered cased ammo regularly then you should be polishing out your barrel chamber too. Even if it looks OK, take a little 000 steel wool lightly webbed on an old bore brush and chuck it in a cordless drill and hone the chamber for ten seconds. Then clean your barrel. Waxing your rounds also leads to better extraction. Work towards that. What is it that I use? You can't buy it anymore but this Zinc coated Bulgarian which is on the hot side and I wax. I'm almost out of it so brass case it the next easiest to load in belts.
Aaron
There is one more thing, does it run fine at first but then after a while start acting up? Are you running the gun just too hot, smoking or red barrels ect. Assuming you are oiling and you can't use too much but you can use too little or non at all? I've seen some folks not use oil and that is a good sign they don't have much of a clue. There is a certain military cadence of fire to keep the heat to a minimal for prolong operation. Its like three or four shots and then wait ten seconds and then repeat. If you are red line shooting then yes your head space will tighten up on you and you can get malfunctions. Are you letting it cool down? BTW you could always do the conversion over to a 1917 for a little extra cooling but the dynamics are the same. Till then leave your top cover open and your bolt back for fastest cooling.
Oh wait there is one more thing that is worth asking, are you running the gun on a buffered mount? Don't ! It messes with the recoil operation and I suspect the timing and its not designed for a buffered mount, its a Browning.
Ah this is all new tula. i got a couple cases for a machine gun shoot. normally we just blast it off in the M14 when we wanna feel like men lol. but that egypt m80. wow. stuff always blows primers and splits some cases.
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