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Something wrong?

 
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  #1  
Old 12-16-2009, 11:14 PM
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Something wrong?

I was expecting to get 3200 -3300 fps in a 300 rum. My chorny was displaying 3160 with max loads of retumbo and 180 TTSX. Does this sound right or should I expect better velocity?

I should mention that it was out of a Sendero and at 6000ft elevation. Seems slow to me

Last edited by tayhot; 12-16-2009 at 11:33 PM.
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  #2  
Old 12-16-2009, 11:43 PM
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Re: Something wrong?

You really need to supply more information. I can get those kind of velocities with my 26" barreled 30-06 using 110 grain bullets.
For all we know you are using a 240 grain Woodleigh, with a 20" barrel. And "max loads" is subjective.

[edit] I just noticed your bullet weight, Oops!
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Last edited by justgoto; 12-16-2009 at 11:45 PM. Reason: noticed my mistake
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  #3  
Old 12-16-2009, 11:54 PM
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Re: Something wrong?

180 gr Barnes TTSX with 93 gr of Retumbo. COAL at 3.600. That velocity is pretty much on par with Barnes load data, except they used a 24" barrel rather than 26" like the Sendero.

I tried 185 Bergers and got about the same velocity but instead of 1/2" groups they were 5" groups
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Old 12-17-2009, 01:05 AM
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Re: Something wrong?

My Hornady handbook says a 180gr bullet in a 26" barrel with 93.3gr of Retumbo should go 3000fps. There is only one load lighter than that at 2900. The max load listed is 102.5 going 3300fps, and that has the red block "use with caution" warning.

So it looks better than ok to me.
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"If you love wealth more than liberty, the tranquility of servitude better than the animating contest of freedom, depart from us in peace. We ask not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains rest lightly upon you and may posterity forget that you were our countrymen."-- Samuel Adams
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Old 12-17-2009, 07:01 PM
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Re: Something wrong?

last summer I loaded for a friend's 300 RUM (CDL, 26" barrel) using 180 TTSX, 180 ballistic tips and 180 accubonds with retumbo. The TTSX would pressure out at lower velocity than the nosler bullets. This has been typical with other cartridges as well in my experience.

Sorry I don't have my loading records on hand right now.
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  #6  
Old 12-17-2009, 11:28 PM
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Re: Something wrong?

What do you mean by pressure out?
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  #7  
Old 12-17-2009, 11:38 PM
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Re: Something wrong?

Interesting,

When I was working up loads for my Friends .300RUM using 180g Barnes TTSX, I was actually using load data from Hodgdon, but for a 180g bullet, not necessarily a TTSX.

It listed the max loads being 100.5g of Retumbo, so I started at 95g and worked up to 100g and decided that 99g was the best and was certainly reasonable on the pressure aspect. Pressure Signs (stiff bolt lift, bras flowing int the extractor, etc...) started at 100g, but were non exhistant at 99g, so I backed it off 1 full grain. I must also add that these loads were worked up at 80 degree F and we did shoot the final loads over a Chrony. The 99g loads go 3400FPS.

As for seating depth, I just made them fit the magazine, I couldn't do much else as seating for accuracy would make the rifle a single shot, it has a generous throat.

These loads are safe in my friends rifle ( a Rem 700 BDL Synthetic, 26"bbl), I'd look at the Hodgdon web site as well as a few other sources and cross referance the data to see what is out there.

It certainly sounds like you're load is really light What is the Max load you're using???? That would certainly help.
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