Check me on this, but, I get the general impression our poster is rather rich in his country, has armed protection, but, has figured out that it's best to depend on your own ability, and firearm, in your own hands, since guards can be bought, bribed, or extorted. Even family can be motivated to get rid of the top dog, to take his place. Carrying a firearm in such a place is an excellent idea, and, since you own the property, I see no reason for you to worry about concealment, other then giving away your advantage.
Other ideas would be a class 3 vest, capable of stopping .308, or, at least 7.62 x 39, and, carrying your 44 at all times.
I would get some rather quick, 185 grain HP's, site the gun at 100 yards, and, you'd have an excellent SD gun.
If armour is in the picture, the bad guys, not yours, by all means, start looking at rifles...or, heavy .429 bullets, monometals, long for caliber that would still retain velocity. Keep in mind there is a reason Punch bullets in the US are classified as armour piercing, and, require lead cores, that just make them tumble more, and, therefore, once they get through a vest, much more devastating...