Howdy Texean
There are so many variables in shooting , and especially with a hand gun , and I think that's why I like six shooters so much , if this gun is new , and new to you, you need to dump a lot of rounds down range , just to get to know the gun , don't file the site , until you absolutely know for sure that you are happy with,
#1 the ammo you're using , are you going to load your own ? or buy commercial new ammo, ( make sure you are happy with it )
#2 the grain bullit you're using ( 165 gr. 200 gr. 220 gr. 230 gr. 250 gr.) you need to settle on one your happy with.
#3 the distance you want to shoot at the most ( 7 yd. 10 yd. 15 yd. 25 yd.)
#4 the GRIP you're useing, this is Very important, fine the grip that works best for you , and practice practice practice it , I have found this to be one thing that a lot of pards ,( at least if your new at this ), fall down on , and it is so important.
#5 Are you happy with the Grips , or are you going to replace them with something eles, ( do this before , ajusting the site )
So you can see there are so many variables to think about, and this just touches on some , there are like you say the lighting , is the sun bright , and reflecting on your gun , or is there enough lighting, can you see clearly your sites, which way is the wind blowing , or not blowing , are you shooting straight out or are you shooting a little down hill , or a little up hill , all these things need to be thought about , and is your gun in working order, once your used to this practice , it will become second nature, and you will know exactly what to do under any circumstance, (IMHO) i'm not saying you don't already know these things, but I thought it would be good to post this for others , that may be haveing trouble too. So I hope this will be of some help Pard.
tEN wOLVES