I have a 50s in .177 also. Mine has been heavily modified from stock, with bore polishing, a full length barrel weight, a 3d printed butt hook, JM kit, JM Hornet seal, etc. When held just right, it is PCP accurate as well- pellet on pellet, but only up to 25 or 30 yards. Greater distances make that feat much more difficult, to the point that any PCP I own is more easily, repeatably accurate (even the lowly Benjamin Discovery).
Just the nature of PCPs vs springers.