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Too much pressure in the 300 RUM?

 
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  #1  
Old 03-30-2005, 09:26 AM
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Too much pressure in the 300 RUM?

Hey guys, I have a question about pressure in the 300 RUM. I am loading 169.5 RBBT HP Wildcat bullet with a charge of 100.0 gr of Retumbo. I use Fed 215 Match primers. The cart overall length is 3.630" in my gun. I have a Rem 700 Police.

With this load, I have noticed that the primers are just slightly starting to crater. I can start to see the firing pin mark starting to make a raised crater. The primers do not seem to be flattening out, just cratering slightly. I shoot 1/4" 4 shot groups at 100 yards with this load.

Is this a sign of too much pressure? Or are the primers of softer materials and this is nothing to concern myself with? Thanks.
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Old 03-30-2005, 02:08 PM
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Re: Too much pressure in the 300 RUM?

I would consider it a max load, or slightly over. It does depend on the firing pin to bore fit and you may be alright if it's just a sloppy fit, or conversely, you could be really hot if it's a tight clearance.

I would pay real close attention to ALL of the pressure indicators, like heavy bolt lift, difficult extraction, prominant ejector marks, primer pocket life.

I get to about 100gr Retumbo with a 178 A-Max and consider this a top load "in my rifle".
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Old 03-30-2005, 02:13 PM
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Re: Too much pressure in the 300 RUM?

Hodgon states 103 as max charge for 165 grain bullets. However each rifle is diferent. 100 grain of retumbo should be a compressed load. This might cause some problems.
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Old 03-30-2005, 04:21 PM
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Re: Too much pressure in the 300 RUM?

I don't have much for the other signs of pressure. The bolt seems to open no problem, not stiff or sticking, the cases aren't buldged anywhere. There are some marks from the extractor, but nothing too major. I am sorry, but I don't know anything about the primer pocket life, so I can't say anything on that one.

d-a
I would assume that the load is compressed, but I have the bullets seated quite long, so there is still alittle more room in the case [img]/ubbthreads/images/graemlins/wink.gif[/img]

Should I back this load off? The only reason that I am shooting this one is because it gives 1/4" 4 shot groups at 100 yards. It is a maximum load according to Seirra's latest manual. The minimum load shots great about - 1/2" to 5/8" 4 shot groups at 100 yards, but not as good. Also, the primers in that load do not seem to be cratering.
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Old 03-30-2005, 07:05 PM
CAM CAM is offline
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Re: Too much pressure in the 300 RUM?

Alucard
I don't shot a 300 rum
But please watch the conditions that you worked up the load in and remember conditions change!
A max load at 32deg might be DEADLY at 100deg
to give up 1/8" for safety is a small price!
Good luck and have fun and be careful [img]/ubbthreads/images/graemlins/smile.gif[/img]

CAM
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Old 03-30-2005, 07:44 PM
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Re: Too much pressure in the 300 RUM?

Alucard: The best way to check for pressure for most of us is by case head expansion. Primers are a vary poor indicator of pressure and can not be relied on. Bolt lift is a good indicator as long as you can remember how the bolt closed before firing ie. high primer? Flattened primers, was the shoulder pushed back when you sized? Neck clearance with bullet seated this changes as the necks thicken with firings and with varying bullet dia. This is why the best way I know of is to go by case head expansion. This is a vary good way to eliminate lots of variables. What may be a safe load in your barrel might take another rifle apart. [img]/ubbthreads/images/graemlins/wink.gif[/img]
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Old 03-30-2005, 08:48 PM
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Re: Too much pressure in the 300 RUM?

Thanks for the info guys. I did test the load in only +4 degrees Celcius. Might not be the greatest thing to do. Yeah, I think that I will cut the load back and save some problems. No need to damage a rifle for 1/8" more of accuracy [img]/ubbthreads/images/graemlins/wink.gif[/img] Thanks again for the advice!
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