I have the opposite "problem". Savage 12 with target chamber and target trigger in .223.
After a thorough cleaning, first two shots cold will be in the exact same hole, then I get a small spread. It still shoots 1/2" at 100 yards for a five shot group.
Did you purchase NIB or is the rifle new only to you?
If NIB, did you follow the painful break in procedure suggested by Savage?
I wouldn't use a bronze or brass brush under any circumstances. Try nylon. What is bronze or brass? They are alloys with a very high percentage of copper. It is going to rub off against the harder steel of a bore and you are going to have copper fouling galore. Use nylon and see what is left in the bore.
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