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300 RUM, 240 SMK, US869 Initial Results

 
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  #8  
Old 06-05-2006, 07:39 AM
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Re: 300 RUM, 240 SMK, US869 Initial Results

Jon A,

I think your right, 800 yards will not be a problem with you and your rifle.

Keep us posted,

Kirby Allen (50)
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  #9  
Old 06-05-2006, 08:17 AM
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Re: 300 RUM, 240 SMK, US869 Initial Results

That is very similar to the results I got w/the 240 and Retumbo. 13 different charges went into about .8" @ 100 yds!!!!

Anxious to see what velocities you are getting.
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Old 06-05-2006, 01:52 PM
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Re: 300 RUM, 240 SMK, US869 Initial Results

Bill, What velocities did you get?? Barrel lenght?
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Old 06-05-2006, 02:59 PM
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Re: 300 RUM, 240 SMK, US869 Initial Results

Yeah, I certainly can’t complain about Retumbo’s accuracy with this bullet. But after being used to H870 the velocity was just depressing, lagging behind by a good 100 fps. I was getting 2850 with the 26” factory barrel. At 26.7” I’d expect this one to top out at around 2875 or so with Retumbo at the same sensible max pressure.

So that shouldn’t be tough to beat. That’s all I was really hoping for with US869—a powder that will keep the accuracy, be somewhat temp stable and beat that velocity (especially with an eye on even heavier bullets in the future). Basically a replacement for H870 with the added bonus of being temp stable (claimed, at least). H50BMG would beat it by 50 fps but accuracy was lousy.

I’d say US869 has already passed the accuracy test for me, and velocity-wise Retumbo sets the bar pretty low—it’s just too fast to be optimum with bullets this heavy. If my educated guestimates are correct, it should beat it by a significant amount.
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  #12  
Old 06-05-2006, 03:07 PM
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Re: 300 RUM, 240 SMK, US869 Initial Results

The bbl is 30" 4 groove Lilja. I ran it up to about 2950 fps but I saw huge node where my velocity only jumped 40 fps over a range of 83-87 gr. So I went w/85 gr and the rifle shot under .25 MOA.

I have no complaints other than this bullet does absolutly terrible in my rifle once it enters the transonic phase. It does good to keep them on a basketball court!!
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  #13  
Old 06-05-2006, 03:57 PM
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Re: 300 RUM, 240 SMK, US869 Initial Results

Bill,

At what distance does the 240 SMK enter the trans phase?

I was always under the impression that the heavier bullets with the higher BC's would outperform the lighter/faster bullets over the long haul. Would a lighter and faster SMK eliminate this problem?

I've avoided the 240's because if my rifle kicks be any harder its likely to break my neck! [img]/ubbthreads/images/graemlins/grin.gif[/img]

Just curious.
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  #14  
Old 06-05-2006, 04:05 PM
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Re: 300 RUM, 240 SMK, US869 Initial Results

Somewhere between 1500 yds and 1600 yds. Looking @ exbals #s it should not be going into the transonic phase yet but, it would go from kicking dirt on pds to hitting in a 10' circle around them!! Might also be that I'm shooting them out of 10" twist. Don't know why, I just know that is what it does.
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