I have a heavy brass schuetzen buttplate that I would like to alter by bending up the lower prong so it would be better for bench shooting. This is a new cast one, I don`t want to break it. I think that if I heat it it will bend with out damage. What sayest thou? Thank you, Paul.

Annealing brass is not as easy as annealing steel! Be sure to anneal it slowly with a wide flame, and immerse it in water immediately to make sure it stays soft.
I wouldn't have an issue bending it after annealing, but before annealing it wont bend much without fracturing. 
If it's already fitted to your buttstock, you'll need to be careful when bending to make sure you don't also bend the plate and have it not fit the gun's stock after bending.

No, Bend brass cold. It gets brittle if hot, but do anneal it
Chuck

I've cut and reworked brass buttplates by brazing them. I had a small Farrow Ballard buttplate on an 1881 Marlin that some fool chopped the prongs off. Since it was factory and serial numbered to the gun I didn't want a replacement. Instead I bought a copy and cut the prongs off that. Then I drilled and tapped the plate and prongs for 10-32 thread and made up a stud to screw into each prong. I beveled the joint areas and screwed the prongs on.  Then brazed up the joints and filed and finished them off. There was a slight color difference, but the joint looked much  better than had I soldered them on and had a line where they met.