Does this make a difference? GH1 
You have gotten a lot of good advice. I would like to share a few thoughts with you. Don't believe ANYTHING you read in a single source and ALWAYS do a load work up starting well below max powder level and LOOK for signs of overpressure as you progress through shooting the load work up.
I was once duing a load work up on a 158 gain jacketed 357 Magnum round using a factory print out for Alliant 2400 powder. I carefully printed out the powder manufacturer information and max powder rating. (I still have that piece of paper as a reminder). I loaded round in 0.2 grain increments (5 rounds per powder increment) from 0.2 above the minimum load to the maximum load.
I took them out to the range and started to shoot them in a Ruger Blackhawk single action 357 magnum. The Ruger is built like a tank and some reloading manuals have sections that show much higher and special max powder loads for both Ruger Blackhawks and Thompson Contender handguns.
As I fired the first five rounds I noted the accuracy the felt muzzle recoil in my reloading spiral binder. The next five rounds seemed pretty stout. The next five seemed really excessive. I was starting to wonder and looked at the the brass for overpressure signs. The primers were getting kind of flattened, but I was well below the manufacturers max powder load.
I shot the next five and they were even more powerful and the primers were even flatter, but still a long way to go until max powder.
I shot the next five and one was hard to extract and they all had much flatter primers. I took some of my spent brass into the range masters office and asked him what he thought. He said that the flattened primers and the very small remaining ring around the primer was a sign of over pressure as was the hard extraction, but hey it was way below what my piece of paper said and my Ruger is a strong action.
I went back out and started to fire the next five. I only shot 2 of the 5 rounds before I decided it was time to quit. Both were hard to extract from the cylinder. I put the ammo away with about 13 or 18 rounds left unfired. I pulled all the unfired rounds with a kennetic bullet puller and felt like a big chicken.
I started to post questions on a number of forums. Within a few weeks when I checked back on the manufacturers website, I found that they had lowered the maximum load to 0.2 grains below where I has stopped my shooting. Therefore, I stopped at a point above max load in a Ruger Blackhawk. I changed my mind from being a chicken to understanding that I always need to trust that little voice in my head that says when to stop.
Lesson learned: (1) Never trust any single source of reloading information, look at several and always start low that is confirmed by several reloading sources. (2) Always due a load work up. Never just pick a powder charge amount if you haven't previously done a work up with a particular firearm, caliber/cartridge, and/or bullet weight. (3) Always look for signs of overpressure and stop at the "first" sign of overpressure. (4) Never feel guilty of stopping below max powder and never feel guilty about pulling loads that you think are too hot.
Good luck, use low conservative values and be careful.
