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Reloading Techniques For Reloading


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300 RUM Issues...

 
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  #15  
Old 04-22-2013, 07:57 PM
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Join Date: Oct 2012
Location: Colorado
Posts: 497
Re: 300 RUM Issues...

I was shooting in 55 degree weather. Primers look fine, but no I haven't tried other primers. Have just used CCI 250 Mag primers. And I don't have access to a chronograph unfortunately. Might have to buy one sometime soon I guess...
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  #16  
Old 04-23-2013, 08:14 AM
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Join Date: Apr 2012
Location: California Central Cost
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Re: 300 RUM Issues...

Quote:
Originally Posted by cohunter14 View Post
Yeah, as an example if I were getting 3,000 fps, I would need only 45 clicks at 700 and 71 clicks at 900, so there are some pretty big differences there.
Unless you've verified your FPS with a chronograph, I believe you are using a BC in your calculations that is too high.

I recommend you recheck your BC and chron numbers.
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  #17  
Old 04-23-2013, 08:50 AM
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Re: 300 RUM Issues...

Quote:
Originally Posted by jfseaman View Post
Unless you've verified your FPS with a chronograph, I believe you are using a BC in your calculations that is too high.

I recommend you recheck your BC and chron numbers.
I guess I just assumed with that many people shooting the 200gr accubond that the BC had been verified for the G7 Ballistic Program on this site. It gives a G1 BC of .588, which is also what Nosler gives out, and a G7 BC of .294. Could that information be that far off? I haven't ever heard anything about the BC's being off for this bullet.
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  #18  
Old 04-23-2013, 09:27 AM
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Re: 300 RUM Issues...

Quote:
Originally Posted by BEEMAN View Post
There are differences. Not sure what the BC of the AccuBond is. But the Berger is .696 I believe with not a lot of bearing surface. My COAL is 3.843" and my friends is 3.9xx. Can't remember exactly. Every gun is different, and so is every barrel. How far off the lands are you? I am 50 thou off and my friend is 22 thou off.
I noticed you and your friend are running from 22 to 50 off. I am new to my RUM and reloading for it. Could you please tell me why so far off? I am not trying to be a wise guy I just was wondering if this is common for the round. I have been doing some load work using ( Sunday temp.55 in western pa. )91.5g Retumbo, Fed. 215, 208 A-Max seated just touching the lands, Ohler crono. doing 3100 with a standard deviation of 5fps. out of a 27.5" Shilen select match tube. Best 5 shot 300yd group 1.12". I don't know anything about seating so far out...I don't think this gun will do much better ( definitely not with me behind it ) than it is. But I have others that may benifit........Thank's for your input.
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  #19  
Old 04-23-2013, 12:04 PM
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Join Date: Oct 2011
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Re: 300 RUM Issues...

With groups like that I would stop there to. I am 50 thou off with 91 gr H1000. I stopped there because it shot really good and didn't see the point of trying for another 50-100 fps. If I do my part it shoots some pretty nice groups. 1.25 three shot group at 400 yds last fall. When I started load development last fall we started as per Bergers instructions at 120 thou off and moved closer and mine tightened up at 50 thou off. We just re measured mine and my throat has eroded. So now I am actually 80 thou off the lands!! Time to rebarrel soon. I have around 1000 rds through it. If your gun likes that load and speed I think I would stop there. Be pretty hard to improve on that.
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  #20  
Old 04-23-2013, 02:07 PM
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Join Date: Jun 2004
Location: Worland, Wyoming
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Re: 300 RUM Issues...

I honestly don't remember how far off the lands I am and don't really care, because it shoots very good at magazine length. Last I remember though is that I have a pretty long throat, so getting close to the lands isn't an option.

In regards to the low velocity with the OP rifle, I would take the gun to a smith and have the bore cast and measured. Sounds to me like a tight bore or possibly a rough bore that isn't fully broken in.
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Remington model 700 300 RUM LH 26" rem ss/blued receiver lam stock 215 Berger @3025/180 NAB @3300
Remington model 700 338 RUM LH 27" Broughton 5C 225NAB@3300 /300gr Berger@2830
Savage LH 22-250
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  #21  
Old 04-23-2013, 02:32 PM
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Join Date: Oct 2012
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Re: 300 RUM Issues...

Quote:
Originally Posted by D.Camilleri View Post
In regards to the low velocity with the OP rifle, I would take the gun to a smith and have the bore cast and measured. Sounds to me like a tight bore or possibly a rough bore that isn't fully broken in.
It is a newer gun with only 60 or so rounds down the tube. Can that cause an increase in pressure or decrease in velocity?
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