Thanks all for the help and replies. I ended up going with the Stoney Point target knobs as I could get them 2 day air shipped ($70 total) to Missoula where I as going to be playing at the Deep Creek Range there. Buffalo Bob was correct in that, on his scope and mine at least (mine is 1/4 min. clicks), the knobs are calibrated for MOA. 2 clicks gets you to the 1/2 MOA etch and 4 clicks gets you to the etch marked "1" and so on to 60 clicks per revolution or 15 MOA per rev. I bought them hoping that what Buffalo Bob found would be true for my scope as well and it was thankfully.
And thanks for the suggestion, ss7mm for the torx scews from Brownells--I'll have to look into that. Have you guys had trouble with the stock screws slipping on the SS spindle or the allen head stripping out or both? I certainly do not want either happening to me.
I did some shooting at 420 yds and 545 yds using the knobs and 1/4 min. clicks calculated from my Sierra ballistics program given the altitude, baro pressure, bc, known MV, etc. I'll have to do some more shooting, but my POI seemed to be the equivalent of about 3 clicks below target center on average. When I played with the ballistics program and lowered the MV from 3285 to 3100 (180 Accubond on what was a stock 300 RUM that I've accurized and carefully loaded for), then it appeared that the clicks would've put me right on target.
The one 420 yd 3-shot group was 1 5/8" and about 2 3/4" low--right on left to right--this with 10 clicks up given my zero. The 545yd groups spread out some due to me getting to the range late and playing with winds that seemed to pick up beyond the 420 yd mark. They were about 4 1/2" low. One thing I can think of is that I estimated barometric pressure off of this chart ( http://www.sablesys.com/baro-altitude.html
) and didn't take a direct reading. Any ideas?
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