While I have had a M75 Sporting for a long time I always favored the M61 for hunting. The action on the M75 is not all that robust and smooth.

For target I use the 40X and the M52.

The M52's are in another class above those little actions. The Brno 455's action is thicker than the M75 however the bolt is not smoother than a M75.

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M75 Sporting