PDA

View Full Version : Factory Loads Too Hot?



chiefgobbler
08-27-2012, 01:41 PM
Took my new Christensen Arms Extreme II 300 RUM to the range for the first time last week. I have not learned how to hand load yet so I went out with two different factory loads. Barnes VOR-TX in 180 Gr. Tipped TSX and Nosler Custom in 180 gr. Accubond. I chose to start with the Barnes as I have had great luck with 180 gr. MRX in my 300 WSM. The first shot was on paper at 100 yards, a quick adjustment of the scope and the second shot hit dead center. Both rounds were a little hard to extract after firing. I was not sure if there was an issue with the gun being new or the ammunition. As per the gun manufacturers recommendation I was cleaning the bore after each shot. I ensured the gun was not overly hot and was alternating with my 300 WSM. As I continued to shoot the Barnes bullets to adjust the scope to the proper elevation at 100yds, rounds were hard to eject to the point that the bolt would not eject a spent cartridge and I had to remove it with the rod. I inspected the gun and could not see any damage. I opted to try the Nosler Ammo. I fired several rounds and they all ejected normally with no issue. Talking with a friend that hand loads and an e-mail response from Christensen Arms both indicate that the Barnes loads may be too hot. Has anybody else had this issue? I did e-mail Barnes, however they have not answered.

On another note, I went back out with the gun a few days later and had the chance to shoot at a Coyote on a ranch where I sight my guns in. This gun is the first gun I have ever owned with a muzzle break. I learned a very tough lesson. Never shoot this gun without hearing protection or the replacing muzzle break! I will never own another gun with a muzzle break and may sell this one.

Bitterroot Bulls
08-27-2012, 01:53 PM
Hard extraction is a big red flag for excessive chamber pressure. Do NOT use that ammo. It may just be that particular lot of ammo, as even factory loaded ammo can be loaded incorrectly.

I do not like muzzle brakes myself, but it is a preference thing for sure.

Colorado Cowboy
08-28-2012, 06:28 AM
Does the brake screw on? If it does, take it off when you are hunting. I have a screw on MB on my .300 Wby that is great for bench work at the range. But when I am hunting, I take it off because of the excessive noise.

Have you looked at the fired cases? Usually if the pressure is up, the primer will show signs of pressure in addition to the sticking cases. Cratering in the primer should be there too. The high pressure will cause the primer metal to extrude around the firing pin and make a ridge you can see and feel. It is possible that the rifle has a tight chamber which can cause higher pressures. I really have a problem with an ammo manufacturer producing ammo that is too "hot". Sure it's possible but they are really sticking their neck out.

I guess it's possible to get a gun with a chamber that has minimum headspace and ammo that is at the max and get this problem, but I sure would have the headspace checked by a Smith and really would be interested in what Barnes has to say.

Just my take....

BobT
08-28-2012, 08:13 AM
I would say the Barnes ammo is too hot for your gun, I would not shoot any more of it. It could be that the throat of your rifle is a little short for that particular ammo and the bullet is into or touching the lands causing an over pressure situation.



On another note, I went back out with the gun a few days later and had the chance to shoot at a Coyote on a ranch where I sight my guns in. This gun is the first gun I have ever owned with a muzzle break. I learned a very tough lesson. Never shoot this gun without hearing protection or the replacing muzzle break! I will never own another gun with a muzzle break and may sell this one.

Take this as advice from someone who has lost nearly all the hearing in one ear, you should never fire any gun without hearing protection, period. The majority of my hearing loss was caused by a .22 rimfire in my ignorant youth. Hearing loss caused by gun fire is cumulative and irreversible, hearing aids won't fix it. Take time to use hearing protection, even when hunting! A muzzle brake can be a tremendous asset to good shooting, even on the light kickers.

Bob

chiefgobbler
08-28-2012, 08:22 AM
Cowboy,

Thank goodness I do have a screw in MB and it is off now unless at the range.

The primers do indicate an issue. There was was visible mark on the area where the lettering is near the primers on all of the Barnes spent cases. This mark is not on the primers of unfired rounds or the spent Nosler cases. There is a very slight ridge on the Barnes primers themselves but not much different from the Noslers. I will have a gunsmith check the chamber to be sure that is ok. Still waiting to hear from Barnes.

Colorado Cowboy
08-28-2012, 12:16 PM
Yep...classic signs of too much pressure.

HuntWYODon
08-28-2012, 02:17 PM
chiefgobbler,
That name cracks me up .
One thing I was wondering. When you are chambering the unfired round, does it seem a little hard to close the bolt ?
Like BobT said, the bullet may be seated out too far and touching the rifling. You can also see if the rifling is making marks on the bullet. A case that is too long will cause problems also. Another sign of pressure besides the primer is the shiney spots on the face of the case from pressure against the bolt face. When your bolt is hard to lift, you will see it. Sounds scarey enought to me, I wouldn't shoot another round of that ammo.

chiefgobbler
08-29-2012, 07:05 AM
Bob,

Can't agree with you more. I use hearing protection hunting ducks, doves, varmits, etc.. I haven't for Big Game but will now. Looking for something that allows me to hear nature and blocks shots and other loud noises.

chiefgobbler
08-29-2012, 07:10 AM
WyoDon,

Yep 30+ years in the Fire Service and a Wild Turkey World Slam led to a hunting buddy giving me this code name.

No problem loading or extracting the unfired rounds and no marks or other indication that they are seated out too far. Small circle marks on the face of the case are there on the Barnes spent cases, not the Noslers.

xtreme
08-29-2012, 07:21 AM
Good advice by all and especially BobT. I too have a hearing loss caused by shooting a 44 mag without hearing protection. I am a fan of muzzle breaks but when hunting I usually use a screw on CR.

BobT
08-29-2012, 10:59 AM
Bob,

Can't agree with you more. I use hearing protection hunting ducks, doves, varmits, etc.. I haven't for Big Game but will now. Looking for something that allows me to hear nature and blocks shots and other loud noises.

I use Walkers Game Ears quite a bit for turkey and small game hunting. When it's windy or just for general big game I use a pair of foam plugs that have a band that goes under your chin, you wear them around your neck and it gets to be second nature to put them on before firing. I would like to have a pair of Sport Ears but they are a little steep for me to swing right now.

A little OT but I would love to do a turkey "slam" they are a passion!

http://i102.photobucket.com/albums/m100/rltjlt/beards001-1.jpg

Bob

chiefgobbler
09-04-2012, 02:12 PM
Very nice collection! I agree on the passion.4094409540964097

Sawfish
09-06-2012, 01:16 PM
Sounds like excess pressure, but maybe some other factors should be considered. What was the outside temperature? Did you leave your gun and/or ammo in the sun before, or between shooting? Did you load a round into a warm/hot gun and leave it there for a period of time before firing? All of these, including minimum headspace and short chamber leade can cause excess pressure. The copper bullets are notoriously long for their weight(s), and may not be compatible with your gun in this weight. You could always try a lighter bullet (which Barnes recommends) than you normally shoot, as it will be shorter in length.

BobT
09-07-2012, 07:46 AM
Very nice collection! I agree on the passion.4094409540964097

Good Lord! How long are those spurs in the third picture? I'm thinking that bird never stepped on a rock. Thanks for sharing!

Bob

chiefgobbler
09-07-2012, 03:11 PM
Sawfish,

Barnes is in the process of pressure testing that lot of ammunition as we speak. Waiting for their response. It was about 65 degrees that day and gun and ammo were out of the Sun. I really feel that it was the ammo, as stated earlier I had no issue with Nosler Custom loads with the same bullet weight, muzzle velocity, etc.

chiefgobbler
09-07-2012, 03:14 PM
Bob,

The spurs are on my Ocellated and were just slightly over 2 inches. It was in the top 5 of the NWTF Records at the time I harvested it. Not sure where it is now.