Outdoor is over, Winter is here

Been mulling this over in my head.  One of my long term goals is to shoot iron sights well. Break 2600 old school with iron sights.  I'm getting better but have issues being able to "see" the front sight under the various indoor conditions with various lighting.

Outdoor iron sights I shoot center mass to help eliminate the bright makes target appear bigger issue.  I'm shooting the middle of a blurry ball so middle is middle no matter how big it appears.

Indoor lighting on the target vs lighting on the sights varies greatly between ranges.  I can not always "see" the front sight when using center mass hold.

If shooting iron sights indoors at different ranges should I change my sight picture to a different hold?  Sub-6 as compared to CM hold?

I found CM to work better during rapid fire when outdoor but indoor lighting hard to distinguish the front sight from the rest of the black.

I may just stay with a dot for the indoor season.  Would like to do well with iron sights but at the same time recognize it may not help my outdoor iron sight technique if I use a different sight picture hold.
Thoughts comments?
Last comment,  Kazakhstan is COLD this time of year.

The indoor range where I shoot actually has better lighting than the covered outdoor ranges where I shoot. With the sight lights I can work with a smaller rear sight notch and still get good sight alignment. On overcast days outside under cover, it is easy to have things start to run together with that size notch.

what sight picture do you use? same indoor and out?

Yes, sub 6 for both because it's all jumbled when I shoot COM indoors or out with the pistol. I can shoot COM at 200 and 300 for High Power though at 600 I go to a Reverse flat tire for that. I wear a lens with a +.75 over my distance script (same as I do for high power). I think that I could go up a little with a wider notch for the rear. 

I've mostly been shooting Indoors and I am unclassified. With the sub 6, I can focus on the front sight pretty well.

I've been working iron sights indoors and out also.  I have always used a 6 o'clock hold both indoors and outdoors.  I also find that different lighting--even at different firing points at the same range creates a slightly different zero.  I'm able to see the sights well enough that I am only a few points off of my last-year's scores with a red dot.  I'm able to shoot slowfire 10s with little difficulty with the 6 o'clock hold.

I used the 6 O'clock hold shooting irons for just the reason you cite. I think you would be wise to not mix them again for your reasons. Center of course w/ dots.

You might consider after the last indoor match doing a large amount of iron practice. Anywhere you can get the feel even if there aren't turning targets.

Ron Habegger

With our indoor lighting, CM was impossible for me.  Black on black fuzz.  I gave up on that.  

I now shoot a line of white.  I also realized that when I stuck my arm out I was thrusting my front sight out in the darkness.  I took a half step back and presto, there was my sight.

Dan, didn't you say you were from Texas at one time.

Come back down here, it's all outdoor here.