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The rest were more of a pattern that a group, any of them would have killed a coyote, but made me realize just what it really takes to punch paper at more than my normal 100 yards. I have killed a groundhog at a shade over 600 yards with my 22-250, but it has a really good trigger,
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IT takes practice, and control. It can be done even with that sort of trigger, however, it isn't something that just happens. Like you mentioned, it is a different critter going from 100 - 300yds, as well as stepping it on out to 500, 800, or further. I have been shooting out to 300 for a while now, even before I came to find this site. My daughter and I built our own range and carefully measured it all out to 300yds. At first man that was a ways, as I had only been exposed to 200yd targets. After working on several rifles though, it has almost become our standard.
Those little things you miss at closer ranges like breathing, moving the rifle slightly as you squeeze become WAY more noticable the further you get. When we hung our plate at 500yds this past fall, I looked through the scope and just thought WOW thats out there. It still is OUT there, compared to 90% of the shots we normally make. However it only took a couple of seccessions to get things into perspective and get on with it. Here is some of the first groups we fired at it, and bear in mind that these are mostly from factory loads as well,
The two shots in yellow are from my buds .270 (Hornady light mag 130gr Interbonds) , the ones in red are from the 25/06 ( Hornady 117gr SST), and the ones in blue are from the first shots with my .270 (58grs RL-22, 130gr SST). I think I could have done better had I shot the .270's again. This was done with about a 15 - 20mph wind coming from about 4 o'clock, to the target. Once I had the hold, you can see that things got better as I went along. The last shots with the 25 the wind had also died down some. I also shot my .270 from off of Polecat shootingh sticks verses the bench like the other two. Trying to duplicate hunting conditions. Trust me I need more practice from the sticks.
So just hang in there and set your mind to burning the powder and it won't be long till your rocking them out there in small cluster as well.