residue on case neck

[MildBill]

I have been working on some loads with imr4166 in my 243 with 80 grain bullets.

Rifle is a tikka t3 stainless lite and so far groups have been very nice.

I do not have chrono data yet, that is next step, along with trying with different primers to see what it likes.

I think I am close to getting something that will work to thump on the coyotes with.

charges are near the max in the hodgdon data

Here is a picture of 4 case necks along with one of what the case necks looked like prior to firing.

Does the build up, in particular the material at the base of the necks on the 2nd two from the left look within reasonable?

seems like I am getting more residue on the necks that what I usually expect to see.

 

[jonbearman]

How many firings on the cases as they look new. Are you wiping necks as you shoot them? If you don't , once you get them home it hardens and a pain to get off.

 

[asauer]

In a factory gun, I wouldn't worry about it.

 

[mshelton]

In a factory gun, I wouldn't worry about it.

and a .223

 

[MildBill]

How many firings on the cases as they look new. Are you wiping necks as you shoot them? If you don't , once you get them home it hardens and a pain to get off.

that was their 3rd firing, and I put some rubbing alcohol on a paper towel and clean the necks off prior to resizing to load again. It seems to come off reasonable enough, but I am still relatively new to metallic reloading.

It is Winchester brass.

 

[expiper]

Bill,,,I always expect to get some blow by on the case neck ,,,it usually looks like a sine wave when things are perfect,,,,if you increace the powder charge most .243 's with un turned necks will leak less around the neck,,,Roger

 

[fourpower]

after each firing wipe necks with KG-1. this is the best carbon remover I have ever tried. you have to see this stuff clean a muzzleloader to believe.

 

[rain164845]

I don't know that I would use kg 1. It also dissolves copper, one of the main components of brass.

 

[michaelnel]

Ballistol on a patch works great for getting carbon off the neck / shoulder area.

 

[deadwooddick]

Ballistol on a patch works great for getting carbon off the neck / shoulder area.

+1… I like Lead-a-Way patches for cleaning necks.

 

[artbosco]

Nevr-Dull does an excellent job of cleaning necks. I've used it for years after trying all kinds of other products. http://www.nevrdull.com/wpimages/wpefd43e35.jpg

 

[Shynloco]

Consider taking a small piece of 00 Steel wool with you and lightly scour each neck after firing, that of course not during a competition string, but just a slow fire string while practicing or testing loads. Otherwise, just throw the casings in a tumbler when you get home and they'll come clean. Has worked for me for years.

Alex

 

[3dogs]

I clean my brass (for match gun) with 0000 steel wool or gray ultra fine Scotch brite (both approx 800 grit), IMO 00 steel wool is to rough,
Jim

 

[Dshooter]

I think the OP wants to know WHY he is getting excess residue on his necks; not how to take it off. SS tumbling gets everything off no problem....anyways, I get the same amount of residue on my necks with a lot of different powder. Mine are custom builds.

 

[michaelnel]

I think the OP wants to know WHY he is getting excess residue on his necks; not how to take it off.

I think you're right. I believe one cause of excessive carbon on the necks is charges too light. The neck doesn't get expanded enough or quickly enough to seal to the chamber and block the gases blowing back.

 

[Juma]

Don't sweat it. The chamber is sealing and doing its job. You have problems if they show carbon on the shoulder. Remember 243 is an overbore cartridge and there is a huge amount of pressure build up.Got 3 T3's in 223. Top rifle.

 

[lpreddick]

Residue on necks will be deposited no matter what. I have a 6 mm br with .0014 clearance over a loaded neck and I get this residue. Powder residue on case body is usually from a reduced charge. 0000 steel wool removes the stuff nicely.

 

[Dshooter]

I think the OP wants to know WHY he is getting excess residue on his necks; not how to take it off.

I think you're right. I believe one cause of excessive carbon on the necks is charges too light. The neck doesn't get expanded enough or quickly enough to seal to the chamber and block the gases blowing back.

I asked the OPs question before also, & had gotten this same response about to light of a charge. I wish it were the case but I'm not thinking so. I had the same residue on all my cases throughout an entire charge range with faster and slower powders. All the way up to charges that produced stiff bolt lift and heavy extractor and ejector marks on cases. I know this is of little help OP; but having gone through the same issues, I know what is NOT the cause. I'll be watching this thread though to learn more myself hopefully.

 

[Dshooter]

I'll rephrase a little. Mine was on my 300 RUM and i was getting it just past the neck/shoulder junction. I still believe OPs residue looked normal.

 

[JohnHenry]

I clean my brass (for match gun) with 0000 steel wool or gray ultra fine Scotch brite (both approx 800 grit), IMO 00 steel wool is to rough,
Jim

+1 on use of 0000 steel wool.