dents in casings - The Carbine Collector's Club

one strange thing is happening, halfway the case I have a dent in it, ammo is factory S&B I assume the case hits someting when ejecting, no clue what or how to prevent it

anyone had this happen too ?

1944 national postal meter .30M1
KNSA (Dutch NRA) Member

I ran into the same dents when purchasing once-fired brass. Roughly 20 out of 100 had these marks. Need a slo-mo video of ejections to solve this mystery.

Dave

According to the Carbine sight this group is linked to the type 5 and 6 slide when compared to previous slides has .040 removed from the front where it rests against the piston and the same amount opened up in the cam where it fits the bolt.

That allows the slide to travel .040 farther front and upon firing develop slightly more momentum before it engages the bolt to take it out of battery and to extract the case.

In my experiance slide type 4 and older are more sensitive to weak recoil springs and weak powder charges or powder charges of improper burn rates.

A stronger spring in the type 4 and older slides requires that the pressure curve develop farther along before it could over power its force and start to take the bolt out of battery.

David Milisock

floydthecat wrote:

Probably involves more than one factor, but the early slide is usually tagged as the culprit. I have never had the issue and my favorite shooter wears a type 3 slide, doesn’t dent brass.

I'd bet you're right more than one thing, my 2 shooters have type 3 slides and make no dents. However I've replaced recoil springs with Wolf extra power springs and my loads are near maximum.

David Milisock

Thanks all, at least something is not broke and the dent will not be a problem reloading the shell.

1944 national postal meter .30M1
KNSA (Dutch NRA) Member

I never experienced such case denting like that on my two Inlands. I understand the carbine cycles and fires just fine. So, I would also, as mentioned above, first replace the recoil spring and use one or two types of new ammo. If you still get those dents, I'd go with type V slide. I replaced a worn type 3 or 4 slide and gained a better ejection pattern. By better I mean less random placement and a tighter pile. It was a noticeable difference. If a fresh spring is not the culprit try a type V slide. Keep us posted regarding what you do.

Liberium wrote:

in Europe parts are much harder to get, but maybe brownells has some wolf springs for my 30M1, it cycles perfect so that isnt the problem, ejection is straigt to the side instead of to the side and back.

if the only problem is the dent I can live with that

The dent is not really a "problem" , sometimes it just happens between the interaction of the :

-ejector and spring

-extractor and spring

-slide and spring

-ammunition loading

Change any of those 6 components and the ejection pattern will likely change.

There are 4(corrected, thanks) different ejector nose shapes, springs can be weak or strong, the extractor or bolt face may

have wear causing it to hold the case longer or not as long against the ejector. Someone already mentioned the differences in ammo from mfg. to mfg.

Even the strength of the hammer spring may affect opening and slide speed!

So, unless you just want to experiment with the 8 or so variables, I'd just accept the small dent

and enjoy the carbine! Smile

Edited by 03manV - Jul 17 2020 at 10:39am

Don

Thanks W5USMC,

post corrected. that's what happens when one "remembers" instead of checking. ;)

Don