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Micro groove....

According to my Brophy book, the first Micro Groove was a model 89-C in 22 caliber. This was announced by Marlin in July, 1953.

Marlin registered "Micro Groove" as a trademark on August 25, 1953.

"Early in 1956 Marlin advertised that all of it's high power rifles in all calibers were being equipped with Micro Groove rifling for extreme accuracy performance."

I got this from pages 584 and 585 of Brophy. Other than the model 89-C, I cannot find specifically where it mentions any particular caliber though.

Maybe I overlooked it. I will reread it again & if I find anything I will get back with you.

Hope I was a little help.
Alaska Lever
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