View Full Version : Micro Groove Barrels
GregLaROCHE
11-03-2018, 03:56 PM
Does the same rule, one thousandth to 3 thousands over bore rule diameter hold true for micro groove barrels? It seems there is a lot less groove for the boolit to obturate into.
What do others think?
wv109323
11-03-2018, 04:02 PM
In my experience yes 1 to 2 thousandths over actual bore size not nominal. The bores are usually over nominal bore size.
Your thinking is correct Sir! There is a saying been floating around here for years "FIT IS KING". General rule, yes, maybe fit before obturate. And check under sight dovetail cuts for tight spots, I think they use to race to see who could cut them the fastest.
HangFireW8
11-03-2018, 06:05 PM
Also check under the roll marks (the logo and/or chunk of words printed on the barrel). Also if it's a 44 or 444 keep in mind the SAAMI spec is NOT the same 0.429" as handgun 44's.
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