Case Splits Marlin 336

J

Jabol

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Hi fellow nutz.
My Marlin 336 seems to be doing this a lot (2 out of 3 shots). This is brand new factory ammo Winnie Super X and Sellier & Bellot caliber 30-30 win. I did not test with any other ammo brand.
What's causing this? This scares me a bit.
Thanks for any thoughts.

Case_Split.jpg
 
I would try some better ammo. I am using hornady leverevolution in my 336A. And it has not shown those kinds of markings. It's accuracy is acceptable,
 
since your not shooting 30-30 in a .32 and you get the same results with 2 different brands of ammo Id take it to a good gunsmith with the fired brass
 
Can-down said:
New gun?
Click to expand...

40 rounds down the tube, 2 out of 3 looking like this. One even was so mangled, it got stuck in the chamber. I had to push through the bore from top with a cleaning rod to get it out. I don't have a picture of it, though. I will try other brands too but that is worrisome nevertheless.
 
I would not keep shooting it until you get it looked at. Very good chance your chamber is buggered. If the gas gets out and isn't sealed by the brass you will get it in your face and that will be nasty. Where you located??
 
I had the same problem once in a .222 with many rounds through it, and reloads... I thought I had a clean chamber, but after some intense scrubbing it never happened again...

Since it is new, I would have it checked.
 
336 and 30.30 amo

Jabol, I have never seen 30.30 brass blown out so there was very little shoulder left. It looks like it was fired in a larger chamber than 30.30.
Have you checked the brass with a caliper? I would take it to a gunsmith and have the chamber checked.
 
looks like something is upping the pressure big time! either that or the chamber was cut too large. was there powder fouling on the forward half of the brass? they look to have been cleaned in the pic. if so id say your chamber is larger than it should be.
 
The only time I've ever seen case necks split like that ,it was from full length resizing the brass when reloading and reusing the cases, like, 40 times.
Thats obviously not your problem though.
I'd definitely get it checked out by a gunsmith,something is seriously wrong.
Good luck with it.
Eric
 
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