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Sierra 6.5mm 123 gr MK, why are we not using it???

 
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  #8  
Old 08-09-2009, 08:31 AM
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Re: Sierra 6.5mm 123 gr MK, why are we not using it???

I love the 123 Scenar out of my 6.5-284 at 3160fps using Vit N-560. Does not kill very well though.
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  #9  
Old 08-09-2009, 09:02 AM
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Re: Sierra 6.5mm 123 gr MK, why are we not using it???

Should do fine in an 8 twist. Its certainly more then needed but in the conventional chamberings, I would not think you would ever have a problem with bullet integrity issues because of excessive RPM levels.

Now something like a 6.5 RUM or 6.5 Allen Magnum, possibly but I would still suspect they would work fine. I have a 6.5 AM bench rifle with a 1-8 so I may give them a try just to see if we can rip them apart. We are hitting 3550 fps with the 142 gr so I would think possibly near 3800 fps would be reachable!!!
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  #10  
Old 06-26-2014, 05:40 PM
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Join Date: Jun 2013
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Re: Sierra 6.5mm 123 gr MK, why are we not using it???

I have a box of 123 SMK's I have been using for load development. My bet groups have been at 2700 fps out of a 24" EABCO barrel with an 8 inch twist. The first test was with IMR-4064. I plan to run some tests with H-414 as well. I'll let you know more as I refine my load.
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  #11  
Old 06-26-2014, 05:41 PM
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Re: Sierra 6.5mm 123 gr MK, why are we not using it???

I have had to scrounge for boxes (100 ct) of 123 SMKs. Does anyone have a source for buying these in bulk (500 ct)?
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  #12  
Old 06-26-2014, 09:32 PM
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Re: Sierra 6.5mm 123 gr MK, why are we not using it???

I think the reason many have moved away from the lighter bullets is because we no longer find super flat trajectories useful with the advent and availability of laser range finders. For hunting, it becomes a sectional density and retained energy game. Less windage as well. I can get 3000-3100'sec with 155 grain bullets in my 308s too but the numbers at 1K for hunting just are not there. Windage, energy etc...the trajectory values are impressive but wind and energy + penetration not so much. 190+ and now we're in buisness. Sectional density and BC wins. Compare a 168smk at 3500'sec versus a 208 amax at 2600'sec. The only advantage the 168 at 900'sec more has is a flatter trajectory. Wind and energy goes to the 208 even at 900'sec less starting velocity. My question here is, with a cheap reliable laser rangefinder, who cares about trajectory?
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