New to the forum.
Just picked up a model 70 xtr sporter .300 winmag never fired not a scratch!
Went and got a box of 180 grain ammo to punch paper. Any one have info or opinion on break in?

Welcome Tcrowe.

Sounds like a nice rifle. I have one in 25-06. You could do a search for 'barrel break in' and probably find a lot to read on it. Many opinions on how to do it best. Here's one of the most recent threads on it: barrel break in procedure

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Seems everyone has their pet idea how barrel break-in should done. I'm in the camp of cleaning after every round to start and working from there. Two things I try to avoid is metal buildup and heat.

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Since the effectiveness of barrel break-in is about as provable as the existence of the Tooth Fairy, I have no advice on the best way to go about it.

Thanks for the info on the barrel break in, it will be helpful. Yup the gun is a real beauty, had my heart set on a kimber and then I was searching some used guns at a local outfit and came across this one for one third the price!
My dad was a big winchester fan and I can see why! I still use his model 12 for duck when the weather is right.

I think the next rifle I would get wold be the 22-250 or the 25-06. Maybe a .243?

I own and shoot a 300WinMag myself. Take your time between rounds to avoid heat build up as Monty suggested and go to the link Shawn provided. Get a sissy pad if you plan on breaking it in in one day. Mine rocks my world with 180 gr bullets.

I remember my m77 in .300 and after a box of ammo I aw ready to call it quits for the day. That was about 15 years ago when I was lean and in shape so with the extra padding I have accumulated over the past few year I should be able to do it without a sissy pad.
The .300 does rock, my 9 year old wants to shoot it.

Disregard my sissy pad suggestion, you know what I'm talking about and welcome to the forum. The first shot I fired from my 300 resulted in my very first scope bite. Since than it has put many white tail in the freezer and even put a few coins in my pocket shooting bench rest comp. with it. Everyone always got a chuckle watching the recoil pound me. Oh, and it's never bit me again either.

I feel heat is the enemy. Avoid getting it too hot. Barrels are rough on the inside. Some build up is good. Shoot until you see your groups expand. Then clean. But realize you may need to shoot a few too see your groups return.

Might want to reevaluate the sissy pad option after shooting it lol. I have an XTR myself, but I took it off the original stock (stock was beat up, lots of scabbard wear, dents, dings...well used rifle) and MAN did that old red pad transmit a bunch of kick! Rifle was much more fun to shoot after the new stock with a good pad. Though mine was in 300 Wby, you could be right in Win Mag it might be totally acceptable with that old pencil eraser pad