What grain should i get for shooting under 100 yard.

I am trying to buy a good quality ammo for my new Noveske i got.

i will be shooting most likely around 100 yard or less.

i dont know what grain i should get for 16inch 1 and 9 twist barrel.

Brand i am going for is BLACK HILLS.

ammo that i can get hands on at this point.

Black Hills 55gr FMJ

Black Hills 68gr. Heavy Match Hollow Point Ammo

Will there be big different between 55gr vs 68gr under 100 yard?

Thank you.

55 gr. will be fine for 100yds and in. if you are sighted in for 55 gr then switch to say 68 gr. you might see a lower impact at 100 yds. in one of my guns the difference between 55gr and 69gr(fed. match) was about an inch.
ymmv

What are you going to do with the ammo?

BHA 55 FMJ and 68 OTM are gold standards and truly outstanding loads for their type. Those FMJ is an excellent training load, the OTM for matches, duty, and small or 2-legged game.