I'm sure you'll always find
a handholder, who'll agree and not give any speck of disagreement.
A 30-30 is at the margin at 250 yards. Even with the new pointed bullets. There are more adequate cartridges for 250 yard shots.
You pay for the misses; no one else. You didn't mention finance problems for your situation. I loved a lever action. But I kept shots within 125 yards with the round nose bullets. Any possible 250 yard shot, I went with the 30-06, one of a number of rifles designed for longer range.
Is it a very familiar site, that you know exactly that the distance was 250 yards? How did you measure it. Even if you know the distance, there is a problem arising with the wind and any possible mirage/shadows. The dropoff at 250 yards is anywhere from about a foot to some 17 inches, depending on the sight-in yardage. Enough to give any one other than a trained sharpshooter, terminal problems.
And if you're a great shot and the cartridge is adequate, in your mind, why did you miss?