I use Nosler 150 BTs in my 30-30 10" with 2x Leupold scope. It tosses IHMSA 1/2 scale chickens sitting at 200 meters about 2 feet. It knocks the 50 lb rams over with authority. I have taken it hunting many times with anticipation of getting a nice mulie out to 200 yards, but no such luck yet. It has taken rock chucks and squirrels out to 200 but doesn't leave a lot to examine.
I use Nosler 150 BTs in my 7x30 waters 14" with 2x leupold scope. It shoots better than the 10" 30-30 referenced above. Last time hunting with it was about 5 years ago and I took a nice black tail doe at 275 paced off yards. (I am a soccer referree and have my pace down to a science.) One shot thru the shoulders. Dime size hole going in, 50 cent piece size hole coming out, dropped like a rock.
I shoot about 5000 rounds thru my long range handguns each year. Once or twice a year matches out to 500 meters or 600 yards are shot.
I have mentioned what I have considered
my limitations above. I had to do a stalk on that doe and got to within the closest range possible on a wide open ridge. No more cover for me to hide to get any closer. Both of my guns shoot minute of angle and both have knocked down hundreds of steel silhouette targets.
I use Nosler bullets, but that is my preference. Any bullet, designed by any US manufacturer, and designated as a 30-30 bullet, will expand at Contender near max velocities out to 200 yards. If you shoot mid-range or moderate Contender book-loads, you limit yourself to about 150 yards.
If you shoot 3-4 times a year out to 100 yards
THAT is your limit. You need to shoot your contender at 150, 200, and any other distance you feel applicable. You need to be able to hit that 8" paper plate at any of those distances. Take out paper plates and place them at several different distances. Put 10 shots in a row into that closest plate and start working your way out. When you can no longer keep 10 shots in the plate, you are close to your max distance.
Keep 'em in the 10 ring right behind the front shoulder!
Steve