Originally Posted by hdog
I have a question about headspace. SAMMI specs limit lengths to 0.850" -0.010". I have some cases for reloading that have been fired one or more times that measure between 0.8365" and 0.8459" (they were given to me). My question is, what dangers are there in reloading those that are up to 0.0035" under limits? Do cases expand in length as in bottleneck rifles.
I reload for the 40 S&W, which is a high pressure round (relatively speaking). I haven't had any length issues yet, but I've only reloaded my cases 4 or 5 times. Take the barrel out of your gun and use it as a go/no-go gauge. Drop in a factory round and note how far the round seats in the chamber. Now drop in a re-sized case and see where it seats. With a light beginning charge, you shouldn't have a problem.
Just as a side not, I use a Lee tumble lube 175 grain SWC ahead of 3.6 grain of Winchester 231 powder for around 750 FPS. This functions my Ruger SR40C just fine and the recoil is nill. Makes an excellent plinking/range/practice load. And while I load up with Hornady Critical Defense ammo in my Ruger GP100 at night, my "pet load" in my SR40C would do some damage if need be. It's my "New York reload".