I had a takedown 1899 in .250 and it would group under MOA consistently; my best groups were 7/16 for 3 shots at 100 yds. That was with 36 gr Reloder 15 and a 100-grain Sierra flatbase. (Pro-hunter, I think).
Also very accurate with 36 graind Rl 15 were the Remington 100 grain PSPCL and the Speer 100 grain flatbase. The Hornady 100 flatbase shot more like 1.25 inches. The Hornady 87 grain shot about the same.
Using 41 grains H4831SC, I could shoot the Hornady 117 RN into 3 inches using iron sights.
Bullets to avoid: 100 grain or heavier Nosler Partition or Barnes X. They are too long. Also avoid any 100 grain boattail for the same reason.
I should add, I got excellent accuracy using the dipper supplied with my Lee dies. Fill it with RL 15, strike off level, fill the case. Top with a 100-grain flatbase.