Re: 300 ultra mag sight in trouble.
+1 to the above post. Need more info. I'll give you my experiance with a 300 RUM SPS Remmy that I bought a couple years ago.
To kick things off, I started with Leupold double dove tail bases and rings. I aligned and lapped these to show no "rocking" under a dial indicator when alternately snugged and loosened. In these went a VXIII 4.5X-14X.
I fire lapped her,lapped the bolt lugs,and bedded her in a BDL magnum take off stock I picked up for a song. A good friend and bencherst rifle smith of mine "tuned up" the stock trigger.
I'm happy to say she is a shooter. 165,180,and 200gr bullets will all clover leaf @ 100yds with their favorite brew. To date the favorite powders are 7828 and Retumbo. I've yet to try the RL25. RL 15,19 & 22 have all been favorite powders of mine in all sorts of calibers,so I'm sure RL25 is a fine propellant for the 30 Ultra.