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Titan,

you may find that after 10-15 shots the barrel does heat up and the POI changes. This is easily fixed by floating the barrel with a a brass shim under the front reciever screw(or getting a proper bed and float job done). If the loose two piece bolt annoys you it is easy to grind a new pin to tighten the bolt halves. After doing this I haven't yet found any difference withthe 77/17HMR, however I've heard it reduces flyers on the 77/22. I also installed a VQ target sear and did some minor stoning of the trigger. The rifle shoots much better than I can hold but averages 0.45 inches at 50 meters on 12 time magnification.
 
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