If there was such a thing as the S&W forum dictionary here are a couple of definitions that would be in it.
"Range gun" 1.) A gun with that will never be used for hunting or self defense but is interesting, fun to shoot, or set up for competition. 2.) A self defense gun that you can shoot well but is so large and heavy it will seldom if ever be carried or used for self defense.
"Carry gun" 1.) A small light gun you cannot hit the broadside of a barn with but actually carry. Seldom shot because others at the range might laugh at how poorly you shoot it and missing is no fun.
If you cannot shoot your carry gun well that is precisely why you should be taking it to the range, not your "range gun". While any trigger time will help the best way to learn to shoot a small gun is to shoot small guns. Practicing with a big, easy to shoot gun is not the same thing.
I was recently reminded of this when I bought a M&P 22c to supplement the S&W 41 I have owned for many years. The 22c is a light and small 22, and the 41 is a large and heavy 22 with a great trigger. Both are strictly range guns I shoot for fun. I shoot the 41 very well but was surprised how poorly I shot the 22c. Being a 22 recoil is not an issue and the gun is accurate. But small light guns are harder to hold on target. All those years of shooting the 41 did not result in my automatically shooting the 22c well. But I did get better with the 22c the more I shot it.
When I go to the range the Glock 43 I use as a carry gun is always in my range bag. I will admit that there are days I just don't feel like shooting it but usually I do. I don't shoot as well as I do my 2.0 compact and due to the higher recoil i don't put as many rounds through it as I would a larger gun. But where I shoot there is no rule requiring that I burn through half a case of ammo every range session.
If someone reading this wants a small gun for CCW my advise would be to jump right in, buy one and start practicing with it. Particularly if they are not a gun enthusiast and will only own that one gun. If you get frustrated and decide you would rather find a way to carry a bigger and heavier gun you can buy one later on.