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Scratching my head with 300 RUM

 
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  #8  
Old 01-12-2010, 11:25 PM
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Join Date: Feb 2002
Location: Rapid City, South dakota
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Re: Scratching my head with 300 RUM

I'm running 95 Grains of Retumbo, Fed 215M primer, Rem Case, 200 AB out of a custom built 700 Rem w/Hart barrel 26" and getting an average of 3220 with no signs of pressure at all. Your load seems a bit higher but that could be the chronograph's error on either yours or my set. I agree it does seem a bit fast from what I have seen from other rifles. Still its not all that bad if your not experiencing any pressure signs. Loose primers, hard bolt lift etc.
On the Ramshot Magnum I have not had any experience with it but those velocity's seem scary. Were you getting any pressure signs at all?????? Odd, really odd.
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  #9  
Old 01-13-2010, 12:10 AM
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Join Date: May 2008
Location: South of Canada and North of Wyoming
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Re: Scratching my head with 300 RUM

I have run 96 gr of Retumbo with 200 AB's in the 3200+ range with no pressure signs but I did have pressure signs with 96.5 gr. I always take chrony readings with a grain of salt. I have two that usually differ in the 20-50 fps range.

Just becareful with your pressure signs. If your primer pockets get loose quickly, you should be backing off. First thing I would do is see how your primers are seating.

I dont know much about Magnum, but those velocities are either awesome or scarry. May have to give it a try.

Mark
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  #10  
Old 01-13-2010, 01:02 AM
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Re: Scratching my head with 300 RUM

I would say you are over the top with Magnum. Your experience is different than mine. I got fabulous groups with 95 gr and 3100 fps with 200 AB in the 300 Rum. at 96.5 I seemed to pressure out and velocity was only 3140. I quit. Factory 700 BDL 26" bbl. I normally run rl25 for about 3150 fps with the 200 ab. Maybe you've got one hell of a fast barrel..he he
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  #11  
Old 01-13-2010, 11:41 AM
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Join Date: Nov 2009
Location: NM
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Re: Scratching my head with 300 RUM

I dont think my chrony was off. When I saw 3400 fps I stopped and shot my .357 sig through it just to make sure it was displaying close to accurate numbers. When i shot the pistol it showed 1410 fps which is right on.

Today I will try the Magnum powder again, but at 96 grains instead of 98. I will also try RL25 and Retumbo.

Wish me luck.
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  #12  
Old 01-13-2010, 02:06 PM
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Re: Scratching my head with 300 RUM

Quote:
Quote:
Originally Posted by tayhot View Post
When i shot the pistol it showed 1410 fps which is right on.
How do you know it was right on?
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  #13  
Old 01-13-2010, 03:06 PM
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Join Date: Dec 2009
Location: New Jersey
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Re: Scratching my head with 300 RUM

300 Remington Ultra Magnum (RUM)

Magnum 200 SIE SBT 85.7 2,732 95.2 3,035 62,910 3.600

I'd say your well above max.
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  #14  
Old 01-13-2010, 06:19 PM
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Re: Scratching my head with 300 RUM

Montana,

I know it was on because I have used my chrony while shooting my pistol several times and before I purchased my chrony I would use my buddies with the same velocity. Unless, both chronies are off and the bullet manufactures posted data is wrong, then I guess your implication is right. I don't know if its right on
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