You can adjust the Suhl factory triggers down on the Suhl 150 I know for sure to 2oz. I had mine set on 1.5oz but it was dry firing some when I let other shooters shoot the gun. If you ease the bolt down, 1.5oz may work on your gun depending on the trigger you have. I could ease the bolt down on 1.5oz and it seemed to work ok for me, but 2oz is better and safer in my opinion. The Suhl 150-1 models I would say have the same exact trigger, but I may be wrong.
Here's how I got mine to 2oz.
Look at this chart and forget whatever else you may hear about doing it a better way. This has worked for me. And I stick with what works.
Screw 1:
adjustment of the way of the let-off point.
(Convenient adjusted from the manufacturer)
Screw 2
by turning to the left decreasing of the trigger weight,
by turning to the right increasing of the trigger weight
(adjustment range/sector 200p = 200g = 3086 grains to 600 p = 600g =
9259 grains)
Screw 3
adjustment (horizontal) of the trigger leaf
Screw 4
by turning to the left increasing of first stage weight,
by turning to the right decreasing of the first stage weight
Screw 5
by turning to the left increasing/ extension of trigger slack,
by turning to the right decreasing/ shortening of trigger slack
Take out screw 2 and the spring and the ball bearing underneath the screw. It will help the trigger to go approx a little lighter. Some say take out screw 1. I couldn't get it out, so I left in in. Screw 4 and 5 are the key screws to adjust to get the trigger down to 2oz. Turn screw 4 and 5 about a 1/4 turn clockwise at a time. Then cock the bolt and test the trigger. If you got a trigger scale, use it to set trigger to 2oz by just adjusting each of these screws a little at a time. If you go too light, all you have to do is go counter clockwise on each of these screws maybe a 1/16" at a time until you get the desired trigger pull you are wanting. If closing the bolt causes the bolt to de-cock, you have the trigger set too light.