The predominant view of the reloading community is that all cases can be sized with a regular sizing die, sized to the shell holder “plus a quarter”, and everything will turn out OK.
There are those who rightfully point out that buckling of the case occurs during seating of the bullet, and crimping can cause issues. I stopped crimping anything but lever action and cast bullets; crimping causes more problems than it solves for jacketed rifle bullets.
I use small base dies whenever I can. This is also anathema to the shooting community, but I have found that I need to small base size cases for best function in gas guns.
I also believe in cartridge head space gages, I use them every time I set up my rifle dies. If you don't have the means to measure what you are doing then you do not have the means to control your process. Without gages and the measurements they provide, all the ink split to date on trouble shooting is well meaning philosophizing.
If you want to really know what is going on, buy the gages.
Often you have cases that were fired in some huge military chamber and a regular sizing die won’t reduce them enough to fit in the chamber. To show this I took this series of pictures and actions:
I have 308 and 30-6 gages, cut by Gene Barnett which are a little out of the ordinary. He cut these gages with his chambering reamer. Standard cartridge headspace gages are cut with a special reamer that is wide in the middle. A standard cartridge headspace gage measures length, not “fatness”. A reamer cut headspace gage will show you if the case is too long and too “fat” for that chamber.
I have a number of 308 small base dies, and I still have my Lee standard die.
I sized a number of my match cases in the Lee die. All of them dropped in the reamer cut case gage. So, if you said you don’t need small base dies, you would be correct most of the time.
So now I had to scratch around trying to find cases that would prove my point.
These two cases are once fired range pickup brass that I found in my brass box. I had to go through about 20 cases before I found a set of really ballooned cases. On the right is the Barnett reamer cut gage.
If you notice one case has completed dropped into the Wilson cartridge headspace gage, while the other has not dropped into the Barnett reamer cut gage. This shows how much they have swelled up after being fired. Must have been a big chamber.
The second picture is of the fattest of the group after sizing in with Lee Die. I trimmed the thing to make sure that the case neck did not interfere with the throat in the gage.
Hopefully you can see that the case did not drop all the way in the case gage. At least on its own. It would have taken a good hard push to get that base all the way in.
This is after resizing in my RCBS small base die. I could not find the RCBS box, so the case/gage are sitting on a Redding small base box. However, that little additional sizing removed the interference fit.
Sometimes cases are so ballooned that even a small base die won’t reduce the case to factory dimensions. It all depends on the chamber the round was fired in.
I know it is extra effort to size cases with small base dies, if you use a good lube like Imperial Sizing wax or RCBS case lube, the effort is somewhat reduced. Still for all the extra bother involved in sizing with small base dies I'll do it for my Garands and M1a's. With those rifles I don’t want any resistance to chambering, I don’t want any delay to bolt closure. Because as the bolt stops and the lugs are turning, that darn free floating firing pin is just tapping the heck out of the primer.
Your rifle, I would not worry about an out of battery slamfire, but as you have found, fat cases will cause jams.
