Originally Posted by joshua99ta
Guys I was just wondering... I'm about to start working up some 30-06 loads w/ some 4831 and some 180 bergers... and I'm seeing a good bit of case length differences. ALMOST all of my once fired 7mm RUMs are 2.850, with a few @ 2.845s. These 30-06 cases are ranging from 2.490-2.509. All sized with the same dies, now not all were fired from the same gun though.
I never even purchased a case trimmer, b/c of the consistency of the once fired 7mmRUM brass. Now to me just looking @ the case trimmers it looks like its going to be hard to get every single case the same lenght without repeatedly checking, and IF you do slip up and cut one a little too much it looks like your gunna start BACK over... IF you have racked up about 50-60 brass, I guess you can set that case out... BUT I like to work in even numbers! lol
I'm gunna order myself a case trimmer this week anyway.
important that you keep your brass trimmed to below MAX
length, it is a safety feature of the brass.
Now, you probably won't run into trouble until your brass grows to around .020" over max length, but not always!
I have a couple of rifles that show 'crimping' when they're only .005" past max length!
This is why it's recommended to trim your brass .010" BELOW
max case length.
30-06 brass tends to stretch/grow quite a bit on each firing, so it's wise to check them often, you can trim ALL
your brass to min spec when you get it, no matter what the initial source.
I normally fire new brass first to iron out any shortcomings such as growing longer on one side and the like, then trim to MIN spec (.010" below MAX.).
2.490" for 30-06 brass is MAX, you really need to trim them back to 2.480" to be on the safe side, the brass you have that measures 2.509" is way over max and needs to be trimmed!
If you do not understand the reasons for this, get yourself a modern reloading manual, they will explain why it's necessary in detail!