When I first got my 7STW,I began trying different powders and bullets working up loads for it.I was getting great accuracy,but I was not getting the velocities I knew it was capable of.The guy I bought my 7STW from gave me a box of factory Winchester Power Point 150gr ammo,so just for the heck of it,I shot a round over the chronograph.It read 3450fps for that 150gr factory round!Now that's what I was hoping for.I pulled the bullet out of one of the factory rounds,weighed the powder,80.0grs.I did a little research and found Winchester was using WXR powder.I went down to the local gun shop and bought a pound to try it out to see if I could duplicate that load.It did.I use that load for my bullets 139-150grs.It's close to max load for the 150gr bullets in my rifle.I dropped down to 77.0grs for 154-160gr bullets,getting 3300fps with the 154gr and 3200fps with the 160gr.WXR is a discontinued powder.I bought quite a bit of it while I still could.From what I researched,it is the same powder as Reloader-22 and they were lots of Norma MRP that didn't meet the specs.I was only getting 15fps less velocity with Reloader-22 than I was getting from WXR and the powders grouped the same,so I guess it may be so.[/Q
Not the only one that thinks the powder was WXR