I typically resize all my reloads by backing off the shell holder by 1/4 turn. It has worked great for me on all my rifles until now. I am using an RCBS 25-06 die and when I back off 1/4 turn or even 1/8 turn, I can feel good pressure when I cam in the case. Usually, I feel little in the way of pressure.
Now, I can live with this, but, assuming the die is accurate, I was wondering what if anything this tells me about the chamber.

Well could be the die is on the long end of spec or the chamber is on the short end.

I had a 6mm a few years back cut to min spec. Used RCBS dies I had to end up taking a file and taking a touch of metal off the shell holder. Factory and new cases were fine but after about 2 reloads I couldn't get the shoulder to bump back. Never was sure if it was the die or chamber but it took a couple $$ and 5 minutes with a file to cure the problem.

Typical instructions for a Full Length Die say to thread the die in towards the shell holder and additional 1/4 turn not to back the die back up off the shell holder. What you are doing is sizing the case body and squeezing it like a baloon and the shoulder is being pushed forward creating a crush fit in your chamber.

Often when partial FL sizing the shoulder moves forward as the case body is sized because the shoulder isn`t held in place or "bumped" back into spec. This causes one to feel the shoulder being set back a touch by the chamber when the cartridge is chambered.
I prefer neck sizing or proper FL sizing just for this reason

Placing the die at any arbitrary position relative to the shell holder is just that -- arbitrary, and it ensures nothing.

If you wish to "partial full length resize" (which may or may not be possible with a given die and chamber), then you should start with the die well off of the shellholder. Mark the neck, shoulder, and upper third of the body of your case with machinist's black or simply smoke it with in the flame of a match or candle. Resize it by turning your die progressively down until you have "sized" whatever portion of the case it is that you wish to resize (usually most of the neck, with light contact on the upper body and hopefully no contact on the shoulder). The case should re-enter your rifle's chamber once this is done. If not, simply screw down a little more until it does. If your die is squeezing the shoulder enough to actually "balloon" the shoulder (very unlikely), then your die is incompatable with your chamber and you need to sell it and buy one of a different brand (yes, they vary significantly.)

I set up my F/L dies like the instructions that come with them say. Screw the die down until it contacts the shell holder, lift the ram and screw it down an additional 1/4 turn and lock it down. If it is set up correctly, when I resize a case there is no gap between the bottom of the die and the shell holder. If there is, I screw the die in further until there isn't a gap.
Then I get a washer or make a washer out of flat stock that's about the thickness of a dime and with a hole in it large enough to fit around the threaded portion of the die. Then I put the washer between the lock nut on the die and the top of the press. The same effect can be gotten by putting a couple of dimes between the lock ring and the top of the press but the washer is handier. Then I an Partial F/L resizing. After a couple of firings, a small donut forms at the neck of the cartridge. I feel this helps align the cartridge in the chamber. After several firings, the case will need to become hard to bring into battery. Then I take the washer out, F/L resize the cases, and start over. Additionally, using the washer, one doesn't have to be re-setting the die and running the risk of buggering up those little screws.

I do it this way for a miriad of cartridges and I've never had to file down a shell holder; I've never experienced bulged cases nor any of the other maladies I read about.

You kind of need to match the die setup to your chamber. I do this by backing the die off 1-1.5 full turns & sizing a case. Try chambering that in your rifle & adjust the die down until the case easily chambers. Then lock that down, that is the correct setting for your chamber to partial size correctly.

Placed an order with Sinclair today so I can put some measurements to work on this issue.