Is Below the Manuals Starting Powder Weight Normal

[DaveT]

@DaveT
You only need to be wrong once for it all to go wrong.
Something I've always wonderd about - Does the season you load the ammo in effect the outcome in respect to the firing season.
For example - If you load the case in summer and shoot the case in summer, how different is it from loading the case in winter and shooting it in summer. is the pressure related to when it is shot or loaded or as I'm guessing it a combination of both.
I am also assuming that once the bullet goes into the case its an airtight seal even with no crimping ?

PS I had a friend at the range the other day who had reloaded his cases and must of put a case that was a slightly smaller caliber/size (can't remember what it was or ment to be) into the mix and the outcome was a cracked case ONLY - he was very lucky.

To your two main points....its the ambient temperature at time of firing which affects pressure..IE Hot = More pressure than on a cold day for a given powder charge....some manufacturers claim temp insensitivity but I do wonder! Best technique for checking all cases are evenly charged is simply to have a little maglight torch (or similar) available to inspect cases in a loading block before bullet seating....build it into a standard routine which you stick to.

One thing I always do after reloading a batch is weigh them all individually as they go into the final box - this has shown up once that I didn't load powder into 1 round - good catch. might of worked for the guy at the range aswell depending on how different the cases were.