Welcome to the forum, hairtrigger25!!
I think the 44mag would be fine out to 100yds or so, but the 45-70 can have a MPBR of well over 200yds if you pick the right load, yet it can be downloaded to 44mag ballistics real easy. Best of both worlds plus you have the option of a lot of big game rifle bullets instead of using pistol bullets. Below is a 2003 list of factory ammo for the 45-70....
$41.54 250g @ 2200fps, 2687fpe, Barnes X Flat Nose (Conley)
$??.?? 300g @ 1810fps, 2182fpe (Remington @ Remington web site)
$20.39 300g @ 1880fps, 2355fpe (Winchester JHP, Natchez)
$20.60 300g @ 1880fps, 2355fpe (Federal, Natchez)
$29.81 300g @ 1880fps, 2355fpe (Winchester Partition Gold, Natchez)
$22.84 300g @ 2100fps, 2938fpe, HP (Conley)
$44.66 300g @ 2100fps, 2938fpe, Barnes Original Flat Point (Conley)
$32.50 300g @ 2100fps, 2938fpe, Nosler Partition (Protected Point) (Conley)
$41.54 300g @ 2100fps, 2938fpe, Barnes X Flat Nose (Conley)
$25.08 350g @ 1970fps, 3017fpe, Hornady JFP (Conley)
$34.89 350g @ 1800fps, 2519fpe, BCSP (Corbon @ Corbon web site)
$19.47 350g @ 2025fps, 3188fpe, PMC @CheaperThanDirt.com)
$39.99 350g @ 2150fps, 3593fpe (Buffalo Bore Ammo @ Cabelas)
$24.99 400g @ 1250fps, 1388fpe (Black Hills @ Cabelas)
$44.66 400g @ 1900fps, 3207fpe, Barnes Original Flat Point (Conley)
$54.46 400g @ 1900fps, 3207fpe, Swift A-Frame Flat Point (Conley)
$12.99 405g @ 1350fps, 1639fpe (PMC @ Cabelas)
$18.99 405g @ 1100fps, 1088fpe (Ultramax @ Cabelas)
$22.50 405g @ 1325fps, 1579fpe, RNFP (Conley)
$18.99 405g @ 1330fps, 1590fpe (Remington @ Cabelas)
$24.50 405g @
(Winchester @ Cascade Ammunition web site)
$35.57 405g @ 1700fps, 2600fpe, FPPE (Corbon @ Corbon web site)
$22.99 405g @ 1900fps, 3247fpe, JSP (Conley)
$39.99 405g @ 2000fps, 3597fpe (Buffalo Bore Ammo @ Cabelas)
$41.99 405g @
(Obsolete Ammunition @ Cabelas)
$50.00 420g @ 1850fps, 3200fpe (Garrett)
$39.99 430g @ 1925fps, 3537fpe (Buffalo Bore Ammo @ Cabelas)
$34.50 460g @ 1650fps, 2780fpe, HC (Corbon @ Corbon web site)
$41.99 500g @
(Obsolete Ammunition @ Cabelas)
$52.99 500g @ 1625fps, 2931fpe (Buffalo Bore Ammo @ Cabelas)
$50.00 540g @ 1550fps, 2880fpe (Garrett)
$180.00 500g @ 1530fps, 2600fpe (Speer AGS Tungsten, Garrett)