I'm new to this forum but hopefully you all can help me.

I mostly shoot Fullbore Target Rifles to distances of 1000m and I have a No4 Mk 1* to play with when I've finished my normal shooting. It holds a good group up to 600m but when I shoot at 900m and 1000m targets it is horrendously inaccurate and the butt markers say they can hear the bullet tumbling.

Is there a fix to this or am I trying to over-reach with a 70+ year old rifle? As far as I can tell it has a good bore with correct headspace and no muzzle wear from pull-throughs. It is a two groove original barrel should that make a difference.

I normally shoot 174gr Privi Partisan and do well enough with my other rifles!

Cheers!
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