If you are hunting in woods, and not flat plains, or where long shots are the norm, stick with what works for you. The .30/.30 has probably killed more deer, and other game, including moose, and elk, etc. than any other hunting rifle in the U.S. . I have a number of guns from .22 to 45/70, lever action Marlin. But my preferred gun is my Dad's Remington model 742 in .30-06. It shoots better than my Browning .30-06. I like the .30-06 because of the versatility in reloading it. You can go from a 110 grain varmint load to a 220 grain big game load. My Friends all had to have the latest guns, from .300 win mags, to .338. Or the newer short rounds. I can get the same game with my .30-06, and it is more versatile. Granted it doesn't send a 250-300 grain chunk of lead out at 3000 plus ft. per second, or is flat shooting, but it is not limited in what I can shoot with it, and the ammo is common. I have a couple of .270's and love them also. My all time favorite used to be my Remington 660, in 6mm. the barrel is shot out, and now it only groups, in the inch and a half-2 inch, or so groups at a hundred yds. . It used to group three shots, you could cover with a dime at a hundred yds. I used to have a winchester, .30-30, and would like to get another. They are great brush guns, and you can hand load a lot of different loads for them also. Plus now that Marlin has the leverloution or however it is spelled, you can use the spire points, and be safe with the tube filled with them. I can't see as well as I used to, and can't shoot as well as I once did, even with a scope. But I at one time preferred iron sights over scopes, in short to medium ranges. I could gain a sight hold much faster with iron sights. Now if I am using iron sights they better be on a shotgun, if I am going to hit anything.
But if you are successful with your rifle, stick by it. A game animal tastes the same no matter which rifle killed it.
Wayne