Dogmatix told me the same thing about the 140gr SGK hollow points he just said to not use them for long range due to them having the BC of a brick, I loaded up 10 rounds of the 56.5 grain charge for this weekend as willie and I are doing a trip to pureora on sunday, the horizontal stringing shown on that load may have been due to the gusty wind I was shooting in along with me probably not squeezing the trigger properly. I do have some hornady 140 grain BTSP to try as well and going to load up a couple over the 56.5 and 55.5 grain charges to see if that makes any difference. Both of those loads are under 1 inch at 50 meters and should be the same out to 100 I am just going to use the hollow points for a bush round at this stage until I can re-test them on the 100 meter range in taupo where I will also try the hornady bullets. I really like the recoil of this round as it is not as sharp as the 130's and feels more like a push than anything else that 56.5 grain charge should be doing around 2800 fps based on the hornady manual as the data matches the length of my barrel which is 24 inches but really need to chrony it to find out for sure.
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