Best .44mag rifle ammo for deer

[cephas]

I'd consider bore specs in search for accuracy. For 44 mag the SAAMI specs the rifle bore a tad larger at .430" and .429" for the pistol.
Most commercial 44 mag ammo utilize .429 bullets. Haven't bought factory ammo for awhile but see by a quick search some .430 is available in jacketed.
I currently handload a 245 gr .432 cast with satisfactory results.

[wis bang]

Remember that FMJ is not allowed for hunting...

Lawful Arms & Ammunition
Deer and Bear, Regular Seasons
• Manually operated (pump, lever, bolt actions, single-shot)
centerfire rifles, shotguns (shotguns do not have to be plugged
when hunting deer, bears or elk) and handguns (revolvers or
single-shots) with all-lead bullet or ball, or bullet designed to
expand on impact;
• Muzzleloading long guns of any type, 44 caliber or larger, or