First centre fire rifle I shot was my dad's 303 with a brass butt plate at 12.

It kicked.

Practice lot with a .22 so you don't develop a flinch.

Put a nice thick butt pad on and you'll be fine.

I use two recoil pads on my 300 Win, mag. the one that came with the synth stock and a slip on on top of that.

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MD