I have lost (misplaced) my copy of the only manual I have that has Rel 25 loads for the 505 Gibbs. I need to load up some 525 gr Woodleighs and 600 gr Barnes solids and I want to use a bulky powder to keep from needing fillers. Any favorites out there? Thanks in advance.

For current Reloader 25 data for the 505 Gibbs, I suggest that you see the Barnes Bullet reload data on that company's web page.
http://www.barnesbullets.com/images/505GibbsWeb.pdf
Remember that Barnes Bullets suggest that their X Bullest be seated 0.05 back off the lands.
Sincerely,

Tiggertate:

A couple of years ago, Geoff at Woodleigh gave me the following loads using the 600 grain PP and FMJ:

110 grains IMR 4320 with an est. muzzle velocity of 2220 FPS. He also suggested using IMR 4350 with a slightly higher charge weight.

I have not used these loads. I decided to use GS Custom 540 grain FPS and use RL 19 per Gerard's suggestion. See www.gscustom.co.za for load data using GS Custom bullets.

Also, you might want to contact Geoff at Woodleigh for any new load data concerning his bullets. I have always found that he responds fairly quickly.

Good Luck.

RCG