Depends on the O/A weight 400 gr bullet 4 grs is only 1 percent.  Tell the truth I don't weight check 
Guessing my 300 grs vary less than 2 grs. Only shooting offhand visual is all mine get.  John would have better advice.

Boats

I should have added the bullet weight which is 180 grains. I normally use Dave Bennetts 190 grain bullets which never vary over, if that, .1 grain in weight. I just thought that I'd try something that's 12 cents a bullet Vs 40 cents to practice with as, with my lack of skill, I need to get in all the shooting that I can!

Few times I weighed ran 10 figured the mean set the scale. Then plus one pile minus another spot on third pile. Store in 38 pistol boxes, lubed then shot as a lot.  So the lot variance was less than the plus minus.

Boats

If I shot long range or bench would worry more about it.  Guessing my sort into 3 lots of weights method will give less than 1 gr variance within the lot.  I stay 500 meters and under with the 38/55.  New 40/65 may work on longer distances and would probably weight sort.

Boats

Johnboy,
Not trying to be contrary or anything here, but where did you pull your information from?  Is there a ballistics program that shows that?   A 1 gr variance on a 535 gr bullet is less than 2 tenths of 1 percent. Can that actually mean 40" at a 1000 yds?  If so, I'm going to have to tighten my standards.  Bob

SSS shooter
You wouldn't care to swap ten of your .38 cal money bullets for ten if my PJ Spitzers would you ?. I would be happy to send my ten first so you can examine the quality prior to a decision. As my bullets are already lubed with SPG this may be a problem if you don't like SPG. The bullet weighs approximately 325gr in 20-1 and all ten would be exactly the same weight. The bullet is a tapered design and really shoots best when breech seated in my CPA Stevens.
I intend to try it tomorrow as fixed ammunition seated shallow with some cork wads between the bullet base and the powder. you never know this might do the trick.
You can contact me at mickjbateman@gmail.com if you are interested. In case you don't know, I'm situated in Australia which may influence your decision owing to postage costs. No offence taken of course if you are not interested. Basically I'm trying to avoid buying any more moulds that may not work.
Mike.