Do you have one?? With Pachmyr grips? Does it grab your skin??
Mine doesn't.
I find the rubber grips to be a nearly necessary accessory. First, the fill my hand, and fill in that space behind the trigger guard so it DOESN'T rap my middle finger.
The gun still "rolls" in my hand, the difference being the muzzle ends up at a 70-80 degree angle, instead of 110-120 degres.
For me they make the gun much more comfortable to grip and shoot than the stock grips, and I prefer the grip of "pachs" over even oversize smooth wood.
The Colt plowhandle style grip is a good choice, for one handed use, such as on horseback, and for recoil levels UP TO the .45 Colt. When you go beyond that, its shortcomings become evident. Such as a stinging pain in the middle finger, for one.
I've got rubber grips on all my Ruger SAs above the Single Six. They make the guns more "shootable" for me. .357 Mag, .45 Colt (including the Ruger only heavy loads) and .44 Mag Super Blackhawk.
Are you getting a ported 4.5" .44 Magnum because its what you want, or because its what they have???
This is not meant as a criticism, but with that gun, you're starting on a steep part of the learning curve.
You can learn it, and do well, but you are risking being overwhelmed and possibly deciding against the whole idea.
4.5" barrel .44 Mag. Blast with full power ammo is something you have to experience to understand. And the shorter barrel means you won't get the full performance of the round.
Ported barrel will reduce muzzle rise. This will reduce the "roll" in your hand, on top of what the rubber grips do, and will result in the gun feeling like it's pounding straight back into your hand.
This is not a good combination for someone just starting out with big bore revolvers. But, we can adapt. Get some .44 Special ammo, along with .44 Mag. The .44 Special will feel very light, compared to magnum ammo. If possible get or make some .44 Mag ammo in the 1,000fps range as your first step up from the Special. There is a significant difference in felt recoil moving from 1000fps up to 1200fps + of full house ammo.
I have a 7.5" Super Blackhawk, with rubber grips. I have a 6.5" S&W M29, with rubber grips. I have a 6" Desert Eagle, and a 10" Contender .44Mag (which also has rubber grips).
The Super Blackhawk is the second most pleasant to shoot with magnum loads. Desert Eagle is first, because its massive weight makes if pleasant to shoot, IF you can hold it up!
I limit my S&W to loads in the 1000fps range or so, only because they are not uncomfortable to shoot. Going much above that, even with rubber grips, simply
hurts… The Contender is a whole different world, being the lightest of them all, but you are only shooting ONE shot.....
I got my first Ruger "hawk" in 83, The Super Blackhawk is enough different from the Blackhawk it feels odd, at first but one soon stops noticing the differences.
Get some factory ammo and hang on!
It won't take much for you to decide you might want to go to something lighter and work up to the heavy stuff.
At this point, don't concern your self with the extra heavy bullets. 240gr will do everything you need, and maybe more than you want to begin with.
Get dies, and components and load "mid range" stuff for a while, get some experience before moving up to max levels. (if you choose to do so)
IN a somewhat flawed analogy, its generally not a good idea to put a beginning driver in a formula 1 racer or an 18 wheeler, the learning curve is steep.
Good Luck, I hope you enjoy it, I'm sure you will, if you learn to walk before you try to run.