Abnormal case stretching?
I have been reloading for several years, kind of at the hobby level. I can turn out some great loads for my '06 and keep my family supplied with hunting ammo. I am a careful guy and have had no problems over the years and would like to keep that way.
My question is this: I seem to be experiencing excessive case stretching. My loads are not powerhouses, Nosler 150 gr. Ballistic Tips over 56.5 gr. IMR 4350. Nice performing loads for what I want without pushing limits or getting all beat up. I make an initial trim on new/once fired brass to 4.484". Often times after one loading these cases have stretched .008-.010", enough to make me want to trim them again.
I have read where most folks can get 3-4 reloadings before having to trim. Since I have a large supply of brass I just keep trimming and tossing after the third trim, but I sure would like to cut down on the labor at every load session. Am I doing something wrong? My Winchester brass seems to be the worst offender, but practically any make will stretch more than I expect on the first firing.
Thoughts........... ideas? My first time here, hoping someone may be able to steer me right. Thanks for your consideration.........
/mike