Hi all, not a very experienced hunter. 

What grain bullet is recommended for hunting Moose with a 270 Winchester.  Son got a draw this year and that's his gun.  Will be buying a bigger gun but can't get the one he wants in time for the season so he'll be using his 270. 

I don't own a 270, but unless your son really wants a bigger gun, no need to worry about been under gunned with a 270 for moose. It's about one of the best cal's for moose, elk and deer there is. 140g , 150g in my opinion( I'm sure others will chime in) will be fine. Remember shot placement is the key with any caliber you carry. Good luck and welcome to AS.

Excellent moose caliber,especially with today's modern bullets. If your son goes to a bigger gun like a .338 remember to make sure the stock fits him and is not a featherlight or else he is going to get beat up by the loads.

Signed Elmer O'Conner.      Or was that Jack Keith? 

https://www.rifleshootermag.com/editorial/jack-o-connor-versus-elmer-keith/83989

Like Walleyes says. And because the .270 is owned by so many folks, there are lower priced cartridges on the market. That means more target, vermin, and varmint shooting. Remember to save your brass, because you can reload that brass with high quality bullets at a very reduced cost to you.

And for that higher caliber gun that your son wants to purchase. Buy one. Have even more fun.

Thanks. I’ll tell him his gun is  more than enough.

Looking forward to this season!

Thanks.

So please help me out here.

How does a 270 with a 140 grain differ to a 30-06 (my rifle) with a 180 grain?

I’d think the 30-06 would be more stopping power with the heavier bullet but is there much difference? 

Just curious.

If we talk pure stopping power, the 30-06 in a 220g bullet would out perform a 270 in a lighter bullet sure.But we are not going after charging grizzlies or water buffalo ( might be a little under gunned with the 06 also if we where) as sonny said moose don’t know the difference. There are volumes of books written on calibers, bullets, muzzle velocity’s, sectional density of bullets, and so on, and it is a neat science to learn. But with new hunters I like to separate that from learning how to stock, shoot and care for the animal after the shot, sometimes people get caught up in the gun more then the hunt. Long winded reply and didn’t really answer the question directly, but it would take 4 guys around a moose camp over a bottle of whiskey to address this topic, and I think you would end up walking away more confused. Both you and your son have two excellent choices in a moose gun with no worries,  post picture of your hunt, successful or not.