Not playing with fire...playing with science.
As I see it, you're not playing with science. You are playing with
language.
The point was raised,
180gr stuff can cause problems.
to which the reply was...
Not in a properly running gun with grease and good springs.
and, as a blanket statement, I don't believe that is true. You are playing the language, by not including enough additional information to prevent misunderstandings and misconceptions.
you are right when you state there is no limit to what bullet weights can be used, HOWEVER you are leaving off the rather important fact that NOT EVERY load in every bullet weight is ok in the Garand.
The problem is, and the misunderstandings come from not enough information. Sure, there are some 180 gr loads that can be run in a Garand, and also there are some that should NOT be, no matter how properly the gun is sprung and lubed.
Now, the general prohibition about heavy bullets is sound advice, when it is aimed at most folks, and especially when those folks are going to be using factory loaded ammo. One can, with research and care, create loads for the Garand that use 180, even 190gr bullets and do not harm the mechanism.
BUT, these aren't the commercial sporting ammo loads from FedRemChester you find for sale everywhere.
So, for the general shooter, the advice to stay away from the heavy bullets and stick with M1 & M2 GI ball or reproductions is sound advice. People repeat that advice, because it is what they have been taught, and have seen it is true, 180s (or others) CAN cause problems. Because unless that ammo has been specifically tailored for the Garand, it generally will cause problems, and the usual commercial stuff IS NOT specifically tailored for the Garand.
When someone disputes that, and says, its not a problem, it will be fine, WITHOUT clarifying further, THAT is a problem, and shoots your credibility right in the butt. No matter how expert you are, and what you actually know, making statements that are patently false on the face of them, does not make you sound like you know what you are talking about.