I disagree. I used to use my 673 remington guide gun in a 350 remy mag exclusively as my elk gun. It is fantastic with the 220 grained bullets out to 250 yards. You don't have the bullet selection that the 35 Whelen does (what I've switched to), but you have a slight edge in velocity potential when loading for the 350 remy mag. I usually just used factory loads. I hadn't gotten into handloading at the time I was using it. I still have it and won't ever get rid of the gun b/c I like it so much. They are also getting pretty hard to get a hold of these days. The folks that buy them usually don't like to get rid of them.
I have a real soft spot for all 35 cals. I have a 35 remy, 358 winchester, 35 Whelen, and a 350 remington mag. All I need now is the big boy, the 358 norma mag
The 350 remy mag is an excellent "brush gun" in any sense of how you personally define a "brush gun". It's good for pigs, elk, deer, black bear, and could probably handle anything up to coastal grizzlies at close enough ranges. The remington guide gun rifle is light, and I think attractive although a little bizarre looking with the unnecessarily ribbed barrel. It's a great gun for anything in the states, and a gun capable of being a very good African plains game rifle. It's got heavier bullets and a greater diameter than the 30 cals making it great at close ranges, but it has the velocity and energy to really reach out at distances up to 250 yards (from my experience) on big game animals such as elk. It also won't cause the meat damage on deer that a 270 or 7 mm mag will. Lastly, it is also a very accurate round and rifle. Go for it. You won't regret the purchase.
As a Taxidermist I look at hundreds of Whitetail Bucks every year. I know that I have seen many different ways people judge the size of racks on live deer. I think for the most part they all are pretty close. I'm going to give you some measurements that I have noticed being right on in just about every deer. We have used it in the last couple years and have only been off by about 5-6 inches. We do study the deer while bowhunting so we get a little more time to look at them....