Quote Originally Posted by Jonathan View Post
There's more to pressure signs than tight or loose chambers. If the bullet is seated touching the lands on one rifle, but another has a longer throat, then the one touching is going to show pressure signs where the other won't. I agree completely that to work up a load, you need to go shoot it. I said that in an earlier post. Like you, I also shoot game with my rifle but like to hone my skills on long range steels. Aim small, hit small.

Not so sure about shooting fast moving targets off the roof of a truck though, I'll leave that to you. 😉

Jonathan.
What Kenny means is rabbits (targets) that will scarper (move) if you don't get the shot off as soon as the opportunity presents, we tend to shoot off the roof of the truck as we may cover 1000-1500 acres in a night over 2 or 3 permissions. We use expanding rounds such as WMR or .22H at relatively short ranges (<100 yards) so precision shooting is not necessary on rabbits and any the get a bit messy go to my very well fed ferrets. As for honing your skills at range, challenge Kenny to a 900 yard match with his k31 and open sights, see who wins

Now we've dealt with ethics..

We all know pressure has more influences than just chamber size or brass volume. As far as I'm aware (I bother another forum member fairly regularly for checking loads that are a bit out there) to use it properly you check the water capacity over a few cases (say 5) and take an average this way you get the fired case / chamber volume for that particular headstamp.

I'm sure it's a useful tool and if you have a sporter barrel that heats very quickly making testing from a cool barrel Very time consuming it will save a lot of time and wasted consumables.