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Old 02-12-2005 | 03:08 PM
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cbanman
 
Joined: Feb 2003
Posts: 141
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From: Kansas
Default accuracy with different loads

I worked up some reloads for my new savage 7mm-08 last night. My goal was to produce a coyote round and a whitetail round. I'm a little new to reloading so I lack some of the tricks and techniques that experience brings. Anyhow, I prepared all my cases identically, cleaned, resized, trimmed etc.. The coyote rounds consisted of 100 gr Sierra hollow points using varget powder. I sighted these in at 75 yards. Groups were around 1". To get the point of impact centered on the target, I had to max out my left right adjustment on the scope as far right as possible.

The whitetail rounds were 140 gr sierra boat tail soft points. Again I used identical cases. The powder used on these rounds was varget also. At 75 yards, these bullets grouped relatively well also at about 1". The problem was that the whitetail rounds point of impact was about 5 inches right and 4 inches lower than the coyote rounds. One other big difference besides the bullet used was the overall cartridge length. Due to the small size of the 100 grain bullets these cartrideges were signifcantly shorter than the 140 gr rounds. I made sure to seat these bullets at least as deep as they were wide. The seating depth was about 0.290". I kept the whitetail rounds at just a little under the 2.800" max length for the 7mm-08.

I guess my question is, should the POI be that much different in the two rounds? Is there anyway I can bring these groupings in close together so that I don't have to adjust the scope to hit where I am aiming when switching loads?

I also read about the importance of the lands to bullet distance. How can I determine this and how important/significant is it?
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