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.300 RUM + 240 SMK loads using US869?

 
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  #1  
Old 07-10-2008, 03:43 PM
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.300 RUM + 240 SMK loads using US869?

Just picked up a pound of US869 and a box of the 240 Sierra Match Kings... I've seen a little bit of data on here for this combo, but most of it seems like it was shot in custom rifles. I'll be running them out of a stock Sendero in .300 RUM...

I'm thinking starting somwhere in the 93 grain range and working up? I'm thinking 2850 should be an acceptable velocity, as long as the accuracy/consistency are there. Anyone got any suggestions on where the velocity should be?
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  #2  
Old 07-13-2008, 11:41 PM
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My "Quick Load" v3.4 93.0g of US 869 2678fps 54,145psi and 99.0g at 2858 at 67,908psi out of a 26'' barrel. You should find an accurate load some where in between if the 1 in 10 twist will stablize those 240g MK's.

Hope this helps!
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Old 07-14-2008, 12:57 AM
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Something isn't right with those numbers. Quickload shows me only 62.2 KSI at 99 grains with a velocity of 2893. That's with the weighting factor at the default of .5--it should be lowered to more accurately represent this case. At .4 it shows only 59.7 KSI at 2914 fps, which is closer to what I've seen in reality.
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Old 07-14-2008, 08:16 AM
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2900 fps with a 240... at under 60k psi would be an awesome load. Especially with the current availability of .300 RUM brass.
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  #5  
Old 07-14-2008, 02:03 PM
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Jon you are correct! my weighting factor was set at .7, I don't have a 300
RUM to compair any data. How do you like yours? I have been thinking about betting a Rem Sendoro.
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Old 07-14-2008, 04:02 PM
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.7! Ouch! That'll do it! ;) I'm glad we figured out the discrepancy though.

I still like it a lot. It's a great round.
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  #7  
Old 07-14-2008, 04:32 PM
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Stupid Question

Quote:
Originally Posted by Jon A View Post
.7! Ouch! That'll do it! ;) I'm glad we figured out the discrepancy though.
I still like it a lot. It's a great round.
I'm sure this is a stupid question, but for the slow-of-mind; what is the weighting factor in Quickload? How (or why) is it applied to your input?
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