I have an old box of .338 Barnes 300 grain RN solids, does anyone have an old reloading book that shows a loaded overall lenght for this bullet?? I have found load data but not the lenght

You may want to ask the folks at Barnes. Here is the URL:

http://www.barnesbullets.com/

Setting your bullets to fit the magazine of your rifle usually works best with big round nose bullets...they take up a lot of powder space and seldom reach the lands when so seated.

raamw,
BTW I shoot the Woodleigh 300 g. RN almost exclusively these days in my .338 Win...I like 69 grs. of RL-22 for 2375 FPS..man that load adds new meaning to knocking down elk..and it works very well on Cape Buffalo in solid form.

Thaqnks for the info.
I did contact Barnes and they stated the bullet should be set .005 tp .01 off the lands for best accuracy, I explained to them that I had a BAR and the magazine would not permit that. They than advised an overall lenght of 3.28"