that's what i'm saying. might as well do it now because i'm not getting any younger

Weight matters but really comes down to how it's carried.

If I had an 11lb rifle I wanted to use and a 8lb raw pack, I'd upgrade to a 4 pound pack.

Also mountain goat big horn terrain varies state to state. CO and Alaska being the worst, Montana, AZ, Wyoming and Idaho being much milder as a percentage

Don't over think it

Weatherby would work for both. The guns too heavy. It sounds like you need a new gun.

He is hunting mountain goat in BC.

CO has nastier elevation, he did fine there he will be fine in B.C. Might get a little saddle sore going in though.

I have no doubt he will do fine.

I'm pretty sure he will do even finer if he's not toting an 11 lb. rifle. IMO that's not "overthinking" anything and not real wild advice. IMO one would have to do some significant "overthinking" to come up with ways to justify toting an 11 lb rifle on that particular hunt.

I purposefully left my Weatherby at home when I went to Colorado and brought my .270 because I didn't want to lug it around....don't know why it would be any different this time ?

Colorado has some tough hikes although really it isn't worse than than a lot of ranches I've hunted in the hill country. What's tough is the miles walked.

I'm in the middle of reading a Jim Carmichael book about his mountain hunts and to hear him tell it hunting a sheep or goat is the most demanding thing you can do.....I don't know if he puffs it up to sell books ( elk hunting is puffed up the same way) but i think I'm psyching myself out.

They killed scores of sheep&goats in the 40's and 50's with bolt action .270's wearing 4x weavers so I don't know why I'm overthinking it.

I should be more concerned about my footwear

^^^^^^^^^^^^^

Footwear and physical conditioning would be at the top of my to do list, have no doubt the rifles you have are up to the task if you are.

I have never hunted sheep or goats but have chased elk and mule deer around the mountains of Montana and hiked some in the mountains of Alberta. The mountain sheep I saw in Alberta there is no way I was in shape to get within range of.

I wouldn't own a 11lb rifle but if that's what I wanted to take I'd take it. End of the day got to shoot what your comfortable with.

I shot my aoudad with a .257 280 yards hammered it. My business partner shot one the next day at 400 plus with a .257 same results mountain goats are smaller than an aoudad.
I have also shot a couple elk with it. No problems.
The only thing I would worry about is the weight for the mountain goat hunt. They live on the edge of high mountains and are hard to get to.
An accumark is not overly heavy but there are lighter options light an ultralight.

Only problem I've seen so far.

Are you going to be taking bullets with you? Will the need arise for bullets to be bought from BC? Are you gonna fly or drive?

I'd say move the 4-16x scope over to the .270 and take that because as others have pointed out, 11lb is not fun to tote around. I lugged around my dad's 9ish-lb .30-06 in Palo Duro Canyon last year, and that wasn't horrible, but not too great either. Then again, my only hunt of that sort and first time, so I wasn't used to it.

God forbid you lose stuff from airline, better to have an abundant cartridge-d rifle than a specialty one like the .257 WBY and 7Rem to an extent. Also, better to lose a Ruger M77 (that is your 270, right?) than a Weatherby Mark V in the airport, or down a cliff

As much as I love my Weatherby I'd throw it off a cliff before I would my ruger.

I've had it 20 years

I hear ya. That's not all that I wrote though

Is an 11 pound rifle, a heavy rifle?

If you are not in shape it wont matter if you carry a 6 or 11 pound rifle you will be miserable. Hunting in the mountains is painful, you have to decide do you want to spread the pain over months of training or have it all in 6 days hunting.

Mail your ammo up 2 weeks prior to hunt and make sure it arrives.

Problem solved

I forgot. I had a customer pick up some 308 Win ammo. He reminded me he shot a big goat with his 257 Wby mag I loaded up for him. He was running the 100 grain TTSX Barnes at 3450+ fps. He said one shot right behind the shoulder, bullet wrecked the other shoulder, and exited. Shot was at a lasered 201 yards. He said it worked perfect. I'll post up pics after he sends them to me.

Dude just pick one I think you're overthinking it.

.257 is enough gun, as others have said. Weight could be a problem, but if you're in good shape it's whatever. Comfortable sling could make it easier as would a pack with a frame and carrying it properly (not sagged so that the weight is pulling back at the base of your spine like I see in a lot of TV shows).

I would love to hunt in the mountains, but with my father's knees that will probably never allow him to and I'd never go hunting without him so it's out of the picture for me. Good luck no matter the choice, I'm sure you'll love it.