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I built 3 rifles every year for myself.
The 7mmRemMag 140 gr always seems to win with keeping the group in the kill zone on the target at 500 yards. Other cartridges are only good to 400 yards for me for a sure kill.

I can fill a mule doe tag every morning.
I can fill an antelope doe tag in 3 days.
I can fill an antelope buck tag in 5 days.
I can find a 3x3 mule buck in 4 days.
I can find a 4x4 mule buck in 7 days.
I have never been able to fill a whitetail doe tag.. they hide and bounce. I typically miss at 100 yards while they are running.

But in October 2015 with a Dumoulin Mauser action, 8" twist ratchet rifling #3 taper Shilen Select match stainless barrel, 6.5-06 chamber, Boyd's pro varmint stock, home made Aluminum bedding, Sightron SIII 3.5x10 scope, 120 gr NBT, IMR-4166, 3200 fps, I was getting good groups at 600 yards.

I caught a white tail doe at 629 yards in wind with a hail Mary shot. I finally filled a white tail doe tag.

I still think 7mmRM is better, the big variable is my low skill.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps