Have a pre 64 model 70 that appears to be bedded in silicon. Stuck! need to remove as trigger is 6.5 lbs and barrel is solid to the forearm. thank you for any ideas in advance.

Silicone maybe? You mean the rubber bathtub caulk stuff?
How to remove it? Heat? Freezing? I never ran into that problem; that stuff is impossible to remove. They do make caulk removers. I would heat it first.

Just tighten your bedding jack fairly tight and put it on the dash or seat of a vehicle in the sun with the windows rolled up for an hour. Then put another half or quarter turn on the jack and keep doing that every half hour or so until the barreled action is free from the stock. The glue goes like stiff taffy in the heat and the slow pressure will just suck it out. I've pulled lots of them where guys have forgotten release agent that way. Silicon should be no difference. It's mostly the steady, annoying pressure that causes the glue to give up. With most bedding compounds the action comes out covered with glue stalagmites and you just cut them from the stock with side cutters. Just like cutting warm candy.

I had a customer bring one of those in , a Mauser with black rtv silicone. I tried freezing , heat , pressure , no luck the stuff rtv was made for automotive use so it was a pia.
The way I removed it was a thin wire Unser the barrel , using a saw motion , eventually it cut to the receiver , I sliced using an exacto knife around the tang , at least the trigger guard wasn't silicones in .
Amazing , I spent more time trying to remove the old action than replacing the barrel . The cheap sob didn't want to pay me for my time . Needless to say , I told him to find another smith .

Make one of these fool things Gary. They pay for themselves the first bedding job in time saved and misplaced aggravation! There is something to be said for hundreds of pounds of carefully applied force. As opposed to rampant violence, swearing and bashing.

https://www.youtube.com/watch?v=TV60DDda7LU

It needed trigger work anyway, so I took it to a pro

Sharing misery feels so good, doesn't it? LOL

Well, I had everybody in the shop looking at my rifle with grate interest for once! Only problem was they were shaking their heads, not nodding. Fortunately, I love a project.

If it is the black RTV silicone that I use for bedding windshields in jeeps with, then you ain't getting it out by any means short of cutting it off.

I made one of those Jacks. It works great.