O. K. guys, first let me say that I do not claim to be a gunsmith, but I have always been able to get all the rifles that I shoot or have worked on to shoot a three shot group at 100 yds that was one inch or under. A friend brought his Ruger 77, 7 mm Remington Mag to me last fall. He wanted me to work up load for it and tune it as needed. I messed with that Ruger off and on for a LONG month. I could not get it to stop throwing the second or third shot! I was to the point that I wanted to break it over the shooting bench!!! Below you can find listed the things that I have tried. Oh yea, he wants me to try again this fall, I had hoped he would trade it off! I am out of ideas !
1.) Bedding tried: Bedded action floated barrel, then full bedded it. I could see little or no improvement between these two methods. I then tried a little pressure between the forearm and the barrel. When I did this the groups did go wild !
2.) Trigger: Crisp 32 oz.
3.) Scope and mounts: The bases are tight and loctite was used. The scope is a Redfield 3x9. I wondered if it was the problem so I sent it to OBS and it checked out O.K. I also have tried this rifle using my Leupold VXIII, 4 1/2X14, the problem was still there using the Leupold. The scope is level to the rifle for sure.
Ammo, I used hand loads only.
1.) Powders tried: H4350, IMR4350, H4831, IMR4831, R22 and R19.
2.) Primers tried: Winchester WLR, Remington 9 ½, Federal 215, Federal 215 match, and CCI 250.
3.) Brass tried: All brass was full length sized and trimmed to 4.490” before loading. Remington, Hornady, Federal, and Winchester.
4.) Bullets tried: He wanted to shoot 160 gr bullets, so I have not tried any lighter weights. Both Nosler Ballistic tip, and Partition 160 gr. Hornady Interlock and SST 160 gr. Barnes X 160 gr.
5.) C.O.L.: I first seated the bullets .10/1000 off the lands. I tried moving the depth of seating up and back.
I need advice. I must be missing something!!!
[ 09-07-2003: Message edited by: deadeye2 ]