In articles and tests I've read it's not so much as some people might think. Certainly not enough to make a difference to anything you may want to shoot.
It will vary on the length of barrel, type of ammo, bullet and type powder used by the handloader or manufacturer.
Looks like the figures given already are about right with what I've read.
Here's a link from this forum
https://thefiringline.com/forums/sho...d.php?t=465655
tipoc