As far as the springs go for the 5906 P/C guns the factory springs would run 14 to 16 lbs. Mostly 14 lbs. I would replace them when they got a 1/2" set about 10-11 lbs. Never had a single issue. BUT I shot 147 WW subsonic in all the models so not very hot ammo. This would produce sub 1" at 25 and from 1 1/2 to just over 2"groups at 50 depending on which gun was being shot. I discovered that the earlier guns I own ( like Navy Engineer's ) with the short dust cover, absolutely loved the 115 or lighter bullets at higher velocity the especially the 105 lead free at 1200 or so. Kinda hard to come by ,but at that time we were lucky to have some UHHH laying around....The short guns DPA and 6906 models shoot it extremely well also. Sub 1'at 25 and very little muzzle flip.
Then when they became availably we ordered 6" guns. These guns did not shoot the fast bullets near as well as the 147 SS. Several of us even sent the guns back complaining of accuracy. I asked if anything had been changed and was told the twist was different ( how,what ,I dont know).I didnt care as long as I had ammo to make it right. Apparently the change , was to accomodate the trend in LE changing from lighter bullets to the heavier 124/147 type bullets. I changed to 147 and bingo the accuracy with the longer gun was back to normal. Something to try if you have an older or newer type gun. These are just my experiences shooting the P/C guns as they came out.
Just another couple things for info only. At one time between my wife and I ,we had 10 or 11 P/C 9mms. 6 PPC-9s all those guns came from the factory with regular S/W delrin grips. Alot of PPC shooters liked the rubber Hogue grips because it set their trigger finger in a better placement on the single action trigger of the PPC-9s. I own PPC 1500, I think one of the last to leave the factory, although they were holding it back due to the serial number, so their may be ones made later. It had standard grips also.
Also about the Wadcutter spring in the 4506s. I had never heard it termed that. When those were shipped it was in the gun as a breakin period spring. They even had a note with them to discard them after 500 rounds I think. So they were never intended to be used for as a standard use spring. I have no Idea what their strength was, I think about 10 lbs. I remember this because for a period of time we were issuing +p ammo and when someone would come in to register a 4506,we would immediately lube the gun for them and replace it with the full power spring to keep the gun from being beat up. Never heard of any malfunction problems. Hope this informed someone of something, It brought back the bad memory of selling my wifes P/C guns, 6" included when she quit shooting. DUH!!!! Now I will have trouble sleeping tonight. HA!
