I lurk here all the time, and am just getting started in longer (itís all relative) range shooting. I recently was able to go through my factory deer rifle and perform some of the basic accurizing work. I have a Remington 700 BDL, in 30-06 with a Leupold 3x9. Pre-accurizing the rifle would only hold a ~4Ē group at 100 yds. I bedded the action with devcon (no pillars), lightened and adjusted the factory trigger (2 lbs), made sure the barrel was floated, and lapped the locking lugs to ~90% contact. I took it out to see how I did with all my improvements, and it did help pretty significantly. After a getting warmed up, and trying really hard to be conscious of my hold, cheek weld, breathing etc. I was able to get it down to a 3/4Ē wide by 2Ē tall 6-shot grouping at 100yds. This was off of fairly stable bench, with sand bag under the front, and my fist under the rear.
Question time Ė Any ideas for what could be causing the vertical stringing? The shots did not ďwalkĒ up, they were high, low, low, high etc. This leads me to believe it is probably not heat warping, and I tried to wait a few minutes between shots to allow the barrel to cool. I am thinking that my hold may be the issue, Iíve read a lot about a hard front rest potentially causing vertical issues, but my shooting wasnít nearly as accurate when I hand my left hand on the forearm (trying to rein in the kick-up), it was better, when I had it as a fist under the stock. Also, lots of people shoot off of bipods, with their fist under the rear, so donít understand how that could be causing it.
All this shooting was done with 165 gr Remington core-lokts. I know that this isnít exactly match grade ammo, but itís what I have on-hand. I will eventually try some nicer ammo, but I canít afford to get into handloading right now.
Any help or tips would be appreciated. I'd love to figure out this issue, and end up with a sub-moa rifle!