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Ejector mark on 3oo RUM need advice

 
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  #1  
Old 09-03-2012, 08:02 PM
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Ejector mark on 3oo RUM need advice

I have a new Christensen Arms 300 RUM. Every once in a while I get a shot with a ejector mark. Primer never flattens. I am shooting new nosler brass. Federal primers. 95 grains of retumbo. nosler 180 accubond. Im not resizing brass at all. Im shooting between 3220 and 3265 fps. I shot 9 shots today and the very first one came out at 3222 fps and showed a good impression of a ejector mark. The rest were fine. I checked over all length on ever shell before I took to range. I double weighed all my powder. They were all the same. The bullet is .024 off the lands. This is brand new brass from nosler. I was having same problem with there old brass and they sent me new brass. Im at the low end with retumbo. My velocity's are not extreme. Why am I having this problem. HELP!
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Old 09-03-2012, 08:43 PM
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Re: Ejector mark on 3oo RUM need advice

You said you are at the low end of Retumbo is that what you mean by the starting load ? the reason I ask is because I load Retumbo at 85.5 grains in my .300 Rum and if I remeber correctly thats my starting load and something like 91 grains was the upper end of the load data that I started with. I can say this for sure tho , I started reading off the net about how everyone was pushing retumbo in the 91 to 94 grains . When I tried to load my rifle with New Nosler brass at these charges I would have ejecter marks and sometimes stiff bolt lift. I was told when I asked a similar question as you have that this would happen as the nosler custom brass is softer than the Remington brass . In short I started using the remington brass again and havent had a problem this far but i am not loading on the HOT side either.

Just an ideah to think on
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Old 09-03-2012, 09:31 PM
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Re: Ejector mark on 3oo RUM need advice

The 3200-3250 fps range for a 300 rum is rather mild but normal. I've seen over 3300 with a 180 and book loads with mine. I'd give the bullet a bit more run to the lands and your pressure symptoms will probably go away. I'm getting 1/2 moa at .15" to .2" run to the rifling. If not, switch to remmy brass like the other poster. It's what I use, but I've seen Nos. do well too.
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Old 09-04-2012, 06:49 AM
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Re: Ejector mark on 3oo RUM need advice

Did you have any oil in the barrel for that first shot? That can really boost the pressure in a 300 RUM. Make sure that you clean all oil out before firing.
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Old 09-04-2012, 07:20 AM
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Re: Ejector mark on 3oo RUM need advice

Quote:
Originally Posted by Footsore View Post
Did you have any oil in the barrel for that first shot? That can really boost the pressure in a 300 RUM. Make sure that you clean all oil out before firing.
+1
some of the slimier cleaners can too if forgotten.
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  #6  
Old 09-04-2012, 07:36 PM
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Re: Ejector mark on 3oo RUM need advice

I run a light coat of oil after I clean. I moved it further away from lands when it happened first time. Didn't seem to help.
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  #7  
Old 09-04-2012, 08:20 PM
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Re: Ejector mark on 3oo RUM need advice

You are still close to the lands. This big of round needs .2" or so to smooth out the initial pressure spike; it's not a 308 where you can bury the bullet in the lands and get away with it. Get much more overbore and you'll need to be nearly 1/2" off the lands to smooth out the pressures(257 roy or 7 rum).
I would try a few rem rum cases if you can to see if it goes away too.
Light oil shouldn't be an issue; I have always used a light oil or hoppes and then run 1 dry patch afterwards leaving some in. I've Never had an issue.
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