Originally Posted by boattailed bandit
So I let my neighbor borrow my reloading set-up last week to work up some rounds for his rifle. We both happen to shoot the same caliber and I had enough loose ones rolling around that I figured itd be okay for a bit. Anyways that being said I got it back the other day and proceeded to load last night. This is the Lee Classic loader, where you do it all by hand with a hammer, I'm still getting started mind you. Back to the point, I didn't happen to check my seating depth and apparently he had adjusted my dies so instead of the 3.32" overall length that I use it is now 3.19". I didn't notice till I did 5 of them and sat them in the box next to some others and noticed somthing wasn't right. I set my depth back to where it was and went back to loading but I'm curious about those short ones. If I fire those in my rifle will there be any chance of adverse effects with my rifle? The reccomended OAL for 270 win is 3.34" but I go 3.32" for personal preference. Not really sure why, I just do. I just wanted to know if I should just give these back to my neighbor and let him deal with it since that was apparently what he loaded his to, or if these are okay to shoot. Just wondering if there is a reason to reload that short that I don't know about or if its dangerous and I need to say somthing to him. Anybody got any info for me? If it helps the rifle is a stock browning a-bolt with a sporter barrel, so its not changed from factory in any way.
I ran the two numbers you posted of the overall length in Quick Load. Your load length of 3.320 and your friends load of 3.190. Shoving the bullet .130 deeper will increases pressure if the load is the same.
I used a 30-06 load I shoot with a COAL of 3.345 with a pressure of 50,130psi. I shoved the bullet to a COAL of 3.190 and the pressure jumped to 55,634psi. That is a 5,500 increase. Now if you have a mellow load there probably would be no danger but if you are at a max load with the 3.320 COAL you might have to replace the rifle and part of your face.
With me not knowing your loads my advice is to pull the bullets don't shoot them. Whenever there is a change to powder, seating depth or primer change drop your load back and work it back up watching for pressure change.
There is nothing wrong with a shorter COAL if the powder has been adjusted and the load worked up staying within a safe pressure. There are a lot of good books and software out there that can get you up to speed on all this little stuff that when combined makes a difference.