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7mm/300 lapua

 
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  #8  
Old 07-30-2008, 10:52 PM
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Capacity wise, the 7mm-338 Lapua has nearly identical case capacity to the 7mm RUM, within a grain or two in capacity. IF your going to stay with this class of capacity, you probably would be better with the RUM in a factory receiver.

Yes, the 7mm Lapua could be loaded to higher chamber pressure but the advantage would not be all that great over the RUM.

My AM is a dramatic change in the Lapua case. shoulder location is moved forward roughly 50 thou, shoulder angle sharpened and body taper set at min. Case capacity is easily 10% over the RUM or 7mm Lapua.

With any of these, your best served with heavy bullets. 160 is what I recommend as minimum to get these large capacity cases working consistantly. Heavier is even better. 180 grs are great, I have heard the 189 Caut bullets are very good also. The 200 gr ULD RBBT is the best I have used in my AM but only with the very slowest surplus ball powders.
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  #9  
Old 07-31-2008, 08:13 PM
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Thanks for the info, much appreciated.
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