Case overall length question????

[Splinter]

I am fairly new to reloading, though I have 5 books on it and 2 people helped me get going. One thing I cant figure out is why when I measured case length before sizing, a case was exactly on maximum length, then after sizing it was slightly longer? Should cases be measured after sizing i am guessing? Also, I dont have a case trimmer yet, can I get away with a few 243 cases being 2.047 vs the noted max of 2.045? If they will cycle properly? I am shooting them in a bolt action. If not, is there a way to trim them without the trimmer until I get a setup for it?

Thank you for your time

[ETD1010]

Yes, measure AFTER sizing, since sizing is what stretches the cases. As for maximum length, I would vote NO to going over that. As to the reality of the danger, i don't know. I've never done it. if you only need to trim that much off, you COULD (as a desperate measure) brush the tip on some 220 grit sandpaper for a few swipes.

[1lostinspace]

You should size then trim, and yes you can get away with .002

[rksimple]

I've gone .020 over with a savage factory 223 barrel (to remedy extraction issues) without any negative effects. You should be just fine in a factory chamber at .002 over.

[StraightShooter]

I have loaded .243 in the same way that you are asking is ok and I didnt have any problems. Try putting a sized and decapped case in your rifle and close the bolt. There shouldnt be any resistance. If there is its definitely a no go. I finally got a trimmer and if you are going to keep loading the same brass over and over you will definitely need one. You probably arent loading a heck of a lot of .243 so i wouldnt spend a ton of money on a trimmer. Just get something basic.

[ar15barrels]

I've gone .020 over with a savage factory 223 barrel (to remedy extraction issues) without any negative effects. You should be just fine in a factory chamber at .002 over.

Factory chambers run anywhere from 0.030" to over 0.100" longer than SAAMI specs on neck length.
Sinclair actually sells measuring buttons that you seat into a case.
Then you chamber the case in the rifle to measure the actual chamber length and determine your true maximum trim length.

[C.G.]

You can also buy case gauges (or gages) which makes checking brass fairly quick and easy. Wilson makes good ones, among other manufacturers.

[supersonic]

Factory chambers run anywhere from 0.030" to over 0.100" longer than SAAMI specs on neck length.
Sinclair actually sells measuring buttons that you seat into a case.
Then you chamber the case in the rifle to measure the actual chamber length and determine your true maximum trim length.

+100% I have one for EVERY caliber I reload. They are the best tool/method for finding out what your chamber length actually is. You can use 'em over & over..............