Hey guys first off I'm new to this sight and look forward to being a part of this great sight, so here is my mystery I have been shooting a savage model 111 6.5 284 with a load of 52 gr h4831, 140 gr bergers and cci 200 primers in nosler brass. I've shot around 180 rounds through it with no apparent signs of pressure, and now I'm getting blown primers and ejector marks, not sure what is going on load has not changed I scrubbed the barrel clean of fouling and reduced the load to 45 grains and still pressure any insight would be greatly appreciated as I am lost right now
6.5 284 reloading mystery??
- Thread starter jig4bass
- Start date
Check for a carbon ring if you have a borescope. If not, try chambering a live round (at the range please...) or a dummy round at home that you color up front with a black magic marker and extract it and look for scrapes on the bullet and neck. If you have a carbon ring and it grows and impinge on your bullet neck, that can cause pressure problems.
I took your advice and colored the bullet The only visible scrape was part way down bullet on one side I assume from ejecting the bullet
Maybe. Is it still there if you do it gently like just pressing the round in by hand and just letting it slide out if you point the muzzle up? Would the round drop free if you just point the muzzle up? You are looking for anything that has changed your chamber dimensions.
How frequently did you clean your chamber?
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That's a good start. I honestly don't know what you mean by ".063" above the ogive" - maybe a photo?
Also are you absolutely sure that you are not seating the bullets longer? I.e. Into the lands?
I would upload a photo but it tells me the file is to large and I can't compress it with my phone but where the bullet seats in the lands it runs .063" towards the brass hard to explain but I believe it's rubbing in the throat area and to be honest I've really ever only cleaned the bore my bad I guess
+1 on the JB bore paste! Scrub that throat!
Check your fired cases for length?
So you definitely have some dimension problem here. It could be:
- Build up of a carbon ring that constricts the neck but if your scratches are in the bullet and not in the case, this is not likely.
- If it rubs in the bullet, then it looks like you are pushing it into the lands. The reason we cannot understand your “0.063” above the ogive” is at least most of us don’t have an absolute idea where exactly the ogive is. Take a look at this drawing I got from the web. Notice the ogive is somewhere down the curve at the front of the bullet that ends up touching the lands. The ogive we use to measure base-to-ogive is likely at a different place since the size of the orifice on the tool is not going to be the same as your barrel’s throat. Use this drawing to tell us where your rubbing is. AGAIN, are you sure you are seating the bullets to the same depth and know where the lands are?
- It could be your neck is too long but you’ve only shot 180 rounds out of this gun so unless you are using old cases or fired them multiple number of times and your case is more than 3.228” – that’s not it.
Ok guys I have an update I scrubbed the throat area as best I could with Barnes cr-10 ( best I had for now) got it to where the bullet would fall out by bumping the stock on a table( still not clean I don't believe) went to the range and shot work up loads starting at 46.5 gr in 1/2 gr increments no visible pressure until 49 gr and again blew primer, put another bullet in by hand and it was sticky again after 16 rounds , I'm positive the bullet is not seated in the lands as I have an aol gauge that reads the lands is at 2.592" and my bullet is 2.523" , the rub mark I'm seeing is on the flat part of the bullet just before it slopes off sorry for confusion( oh and im getting my ogive point off of an hornady ogive tool for my caliper , thanks for all you guys help it's really helping
From your description - a carbon ring... According to the guys in the know (on this website) who has dealt with carbon ring, this stuff is the way to deal with a carbon ring. Buy their cleaner and nylon brush to do the job. I think the stuff is available on Amazon. Lucky for me, I have the stuff but have not had to use it yet. I think keeping your bore clean is what you need to do to avoid this in the future.
http://iosso.com/products/bore-cleaner/
http://iosso.com/products/bore-cleaner/
dmoran
Donovan Moran
A true carbon ring can take a lot of emphasis and elbow grease concentrated on the chambers end and first part of the throat. Here's a reference image of a carbon ring:
Soft nylon brushes will not mechanically remove hard carbon vey well at all - IME
Even the stiff nylons lack in comparison to bronze brushes.
Iosso bore past works very well on hard carbon (better then JB in my experience).
They can be very stubborn to get removed.
Donovan
Soft nylon brushes will not mechanically remove hard carbon vey well at all - IME
Even the stiff nylons lack in comparison to bronze brushes.
Iosso bore past works very well on hard carbon (better then JB in my experience).
They can be very stubborn to get removed.
Donovan
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