I'd look no further than your bullseye powder.
The 50yd line I'd be looking at the nosler 185gr jacketed hp's.
4.5gr bullseye powder
1.250" oal
.469/.470 crimp
825fps
For cheap shooting or general range plinking, the h&g #68 200gr swc.
3.6gr to 4.0gr of bullseye powder
1.250" oal
.469/.470 crimp
775fps
Other use the h&g #130 they say they are better for the 50yd line. I've always used the h&g #68 so when I read a bunch of good things about the springfield armory 1911's I figured I pick 1 up and see what all the talk was about. When with a plain jane ro (range officer) just wanted accuracy, not the bells and whistles. A 10-shot group @ 50ft.
Interestingly enough I picked up a custom mold for the h&g #68. It casts solid swc's and hp swc's. I use the same load for both and the hp swc (190gr) does better on the 50yd line.
Like the springfield ro nm1911 in 45acp enough that I bought another one, this time a full sized 1911 in 9mm. The 9mm ro will give the 45acp ro all it can handle. A 1100fps 125gr hp plinking load that can be used for bullseye, 10-shot group @ 50ft.
I only shot bullseye @ 50ft anymore so that why the 50ft targets.
Good luck and enjoy your springfield. I enjoy mine. Note the early grips on the 45acp ro (no range officer name in them).