Any firearms/ammo experts know what would cause this outward dimple?

2022-04-29T18:23:45-04:00

I'm shooting .222 Remington 35gr out of my .222 Springfield Model 840. 5 rounds fired and all 5 rounds dimpled out. This is not the only ammo brand to do this. Can anyone give advice? See pic.

Response by SSG Michael Noll made Apr 29 at 2022 6:59 PM

2022-04-29T18:59:06-04:00

I have had no such issues with three different brands I have used. Sorry not much help. Savage 340D.

Response by MAJ Byron Oyler made Apr 29 at 2022 7:01 PM

2022-04-29T19:01:19-04:00

We talking about the mark towards the bottom? That is odd. One could suspect weak case but if more than one batch? Look inside the barrel and see if there is a defect. Cases will expand to the barrel they are fired from but usually it is uniform and not like this. I am interested to others opinions as well. I do reload and have some good knowledge.

Response by SSG William Jones made Apr 29 at 2022 11:56 PM

2022-04-29T23:56:36-04:00

It looks like a scratch but I'll take your word, of course. I can't enlarge this on my phone. There must be a very small crater in the chamber of your weapon. Doesn't look like it would significantly impact the life of the brass or hamper the reloading of it. Your sizing die should make it disappear. I'm convinced that it's a near microscopic crater in your chamber.

Response by SPC James Neidig made Apr 30 at 2022 1:23 AM

2022-04-30T01:23:21-04:00

A Few Question’s, Are They Factory Loads or Hand-loads ? Are They Ejecting Properly Or Binding In The Chamber ? I Do A lot Of Rifle And Handgun Shooting And Some Reloading, I May Be Able To Answer Your Question But Need More Information

Response by SFC Private RallyPoint Member made Apr 30 at 2022 9:38 AM

2022-04-30T09:38:47-04:00

I never saw this before. Were all the dimples the same shape in the same location?

Response by SGT Private RallyPoint Member made Apr 30 at 2022 11:28 AM

2022-04-30T11:28:05-04:00

I'm agreeing with your take SSG William Jones . There's a ding in the chamber wall and the casing is deforming in to it. That's what is causing the extraction problem also. Retire this rifle until it can be gone over by a Smith and the chamber x-rayed for cracks.

Response by MSgt Private RallyPoint Member made Apr 30 at 2022 12:02 PM

2022-04-30T12:02:36-04:00

Did you recently clean the rifle? Sometimes an oily chamber may allow the case to move backward with more force and cause increased case expansion.

Response by SGM Erik Marquez made Apr 30 at 2022 2:49 PM

2022-04-30T14:49:56-04:00

This in the circle? And it it concave yes? Not an outward protrusion
If so I would be looking for what the case is hitting upon extraction and being flipped out of the receiver.

Response by SFC William Linnell made May 2 at 2022 9:26 AM

2022-05-02T09:26:22-04:00

I blew up your photo. Not really sure where your talking about. I might believe you're talking about that one down on the right side of the casing which looks like a crease mark. But under it it looks like a side dimple as you say. Like Major Oyler said, it could be a spot inside the chamber. If you don't have a bore scope, take it to a professional to have it bore scoped. The same answer can be used for up at the top of the neck on the left side, kinda looks like it might be out a bit past the actual straight line that it should be as the chamber seats the front tip of the casing and lead. Those are the only two I can see (?). Could also be that one of the rifle grooves could be a tiny bit longer so the end of the case when fire expands in that rifling.

If there are No defects seen with the bore scope shouldn't be a problem. Also with the bore scope the gun smith should take the weapon down so they can inspect the outside of the barrel too.

Response by SFC Ralph E Kelley made May 2 at 2022 3:58 PM

2022-05-02T15:58:13-04:00

I would say on the top one the reload was 'tamped/packed too tight
Solution: Don't pull it so hard or get a marked spring stop to indicate where to crimp..
On the side, if the ejection is sticking then you're getting over pressure from the reload.
Solution: Try to make less of a hot load. Over-pressure is the problem.
If this isn't a reload then the problem is the ammo you're buying isn't quite right for the rifle you're using. Try swapping to a different, lower grain load and maybe a different shaped bullet head that's a better fits the manufacturer's original rounds.

Response by 1SG(P) Private RallyPoint Member made May 4 at 2022 1:06 PM

2022-05-04T13:06:49-04:00

I would check the chamber to ensure there is no visible abnormality. There is obviously uneven pressure distribution.

Response by A1C Medrick "Rick" DeVaney made May 4 at 2022 5:36 PM

2022-05-04T17:36:13-04:00

Perhaps An Inward Punch With A Hammer?

Response by Larissa Baxter made Mar 2 at 2023 10:46 PM

2023-03-02T22:46:06-05:00

Hey, folks. I'm new here, and I'd like to refresh this thread with my 2 cents. As I know, the group responsible for managing the supply of ammunition is typically the logistics section, also known as S4.