I had the same issue with my 420. I spoke with the service center in Idaho and was told to back out the turret screws 4-5 times and pull up really hard. Then push down to lock the turret, then tighten the screws. That worked for me and no more issues. You have to make sure going forward to...
I am using one for loading 300 prc on my Forster with no problem at all for clearance. I did have RCBS make a custom seater stem to load the 230gr A-tip. My oal is 3.755 so it should be fine.
Re: JP LRP-07 Rifle
I ordered mine the begining of November 08 and got it in Jan. I ordered it with a 18" barrel and heat sink. The rifle shoots great, 5 shot groups averaging 5/8" at 100 yds.
Re: Help = US Optics SN3 does not fit in Larue Mount
Falar, the LT-158 will work with the SN-3 without the t-pal. I have the SN-3 1.8-10 x 44 ergo mounted in the LT-158 and it fits perfect.