Stock on that 150 is nice, I have two, on actually in UPS hands to be delivered tomorrow after getting resealed and new springs , also a 300s that I bought new back around 1984 and a 602 Meistergrade, slightly upgrade or modified 601, but the Meistergrade has a beautiful walnut stock. It had a few minor scars which easily steamed and sanded out, right along the forearm rail, so I reworked it and it looks almost new.
For a more extended shooting session I like the 150 and 300 rifles over the 602, that SSP is much harder to cock, or charge to shoot than cocking one of those fantastic springers, plus if I want to shoot offhand, the 602 is much heavier, accuracy for my part they are very similar.
My bench setup is almost identical to yours, same BR bench and front rest. Instead of a heavy shipping pad, I have a thick canvas tarpaulin . I am in the process of making a "sled" for my front rest so the feet will not penetrate the tarp and scar my bench top, It's basically a piece of 1x12 oak board, I cut short 45 angles on front so no sharp corner, and then a long taper on end for long end of the front rest, then 3 holes about 1/4 way through board to register feet of the rest. It is smoot enough that I can slide it on the tarp , but still heavy enough to stay put while shooting. Right now It is out under my carport with a second application of linseed oil to seal and make it water repellant just in case. We are supposed to get heavy rain today so no chance to try it out.
2pm here now, just tried to look outside and it is dark, almost like night. Light rain and lots of thunder. Just checked rain gauge, 2 1/2 inches in just under 1 1/2 hours. Yard is soaked, too soggy to get out to set up targets.
