The 140 gr SMK has the advantage of potentially be forgiving during the load development process and more compatible with slower twist 6.5 rifles. This in turn provides a noticeably flatter trajectory at extended ranges.īoth bullets have proven to be extremely accurate and continue to provide excellent results. The #1742 142 MK of course has a considerably higher BC value than does the #1740. Being very similar to the #1730 140 SBT GameKing, it was a very easy transition when switching from a target load to a hunting load in a dual-purpose rifle. The #1740 140 MK also had a more “standard” tangent ogive that can be a bit more forgiving when trying to determine an OAL for accuracy. The #1742 142 MK really needs a barrel twist rate of 1×8″for good stability. The 140 MK did very well in those rifles. 260 Remington rifles made when it was first introduced came out with 1×9″ twist barrels. The #1740 140 MK bullet is often selected as a good choice for a long range bullet in those firearms that are barreled with slower twist barrels. To answer this, I reached out to Sierra Bullets. It seems like selecting the 142 gr over the 140 gr would be a no brainer, but there had to be a reason that Sierra offers both. 526 between 28 fps, while the 142 SMK has BCs of.626 2850 fps and above. The 140 gr SMK has banded G1 ballistic coefficients (BC) of. You’ll note the 140 gr SMK (left) is shorter than the 142 gr SMK (right). and its authors, do not assume any responsibility, directly or indirectly for the safety of the readers attempting to follow any instructions or perform any of the tasks shown, or the use or misuse of any information contained herein, on this website.įor bullets, I selected the Sierra 6.5mm 140 gr. Consult appropriate load manuals prior to developing your own handloads. They are only safe in the rifle shown and may not be safe in yours. WARNING: The loads shown are for informational purposes only. All the parts, the barrel, chassis, scope and trigger work well for a really nice shooting rifle.īefore we get to the good stuff, please take time to read the following disclaimer about reloading: I really like the way the rifle turned out.
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