Bullet weight variance

[HKMark23]

The answer to that question is NO.
What kind of a pistol do you think you have that a tiny bit of (maybe) extra pressure is going to blow it up, or make things dangerous?
Are you now loading so high that a couple of pounds extra pressure is dangerous?
Come on, think things out!
Howver, I don't know what company makes bullets that vary by 3%.
The figure of .3% is about right with factory hunting bullets.

Diddling around with "Quickload" I find that Pmax for my particular load, (5.8 gr of N320 under a 185gr JSWC) is 17,595 psi. Switching to a 200 gr bullet and leaving everything else the same gives a Pmax of 21,894 psi which is a difference of 4,299 psi. extrapolating for a bullet weight of 190.55 (+3%) I get a difference of 1,590.63 psi. I do realize that you probably can't just extrapolate like this but the program won't allow for arbitrary changes in bullet weight. Still, a difference of this order combined with other variances such as in COL and tossed loads, its gonna add up, no ? I got the 3% from one of the posts above.

Anyhow, changing parameters by a small margin in "Quickload" yields some surprising results at times and though this time it may not, in fact, be all that significant the difference is still more than a couple of pounds.

 

[H4831]

I will stick by my general assumption. Of course, the couple of pounds, was not meant to be two pounds more pressure, but rather an insignifacant amount.
A bullet mold I had for the 44 mag was supposed to be 245 grains. Depending on the alloy I used the bullet weights went anywhere from about 240 to as much as 260 grains.
I nearly always loaded the 44 to full book load, or sometimes if using H110, I went a grain over book load and fired them in revolvers and Marlin rifles. (Yes, I used the plural of both revolver and rifle, because I have had five 44 mag revolvers and two Marlin rifles.)
Never, on any occasion, with either rifle or revolver, could I notice any sign whatsoever, regarding pressure, whether my bullets weighed 240 or 260 grains.