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HELP!! Ruger 77, 7mm Remington Mag

 
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  #8  
Old 11-20-2011, 11:29 AM
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Re: HELP!! Ruger 77, 7mm Remington Mag

Been using both Hornaday 154gr flat base & 162 gr SBT in my Ruger 77, 7MM mag. for several years. Never really got the group I wanted at 100yds. Always used Sierra SBT's in my Ruger 77, .270 Win. with tack driving accuracy. The same with my 57 year old .270 Win. Remington pump.
I have a box of .284 Sierra SBT's in 150gr. sitting on the shelf. Gonna give 'em a whirl. Don't know why I didn't use them before 'cause Sierras always performed well in any rifle or pistol I've loaded for.
Does anyone have any input on on starting loads for this bullet in this caliber? Always been a big fan of either H4831 or IMR4831.
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  #9  
Old 11-20-2011, 11:55 AM
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Re: HELP!! Ruger 77, 7mm Remington Mag

Try a box of factory loads and see if it does the same
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  #10  
Old 11-21-2011, 04:17 PM
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Re: HELP!! Ruger 77, 7mm Remington Mag

Quote:
Originally Posted by Sully2 View Post
Try a box of factory loads and see if it does the same
Lord! I haven't bought a box of factory loads in say . . . fourty years! Whenever I got a new rifle or pistol I bought the makings to reload the ammo & went from there. Gonna try these Sierra 150gr. SBT's first. It's not that the rifle dosen't shoot in the "dead" zone at 100 yrds., it's just that I want a tighter group than 1 1/2". But I will keep your suggestion in mind . . . believe me.
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  #11  
Old 11-21-2011, 04:35 PM
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Re: HELP!! Ruger 77, 7mm Remington Mag

im betting that the barrels twist rate is better suited to rather lighter or heavier bullets than just the 160's.
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  #12  
Old 11-21-2011, 05:57 PM
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Re: HELP!! Ruger 77, 7mm Remington Mag

Quote:
Originally Posted by deadeye2 View Post
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 , 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!!!
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[ 09-07-2003: Message edited by: deadeye2 ]
My best performing loads for my old 7mm mag were H-870 and H-1000 using hornady 140gr interlocks and interbonds. Always used the cci magnum primers.

H-1000 at around 72-74gr gave me one hole accuracy and very good velocities from both my Mod 700 and Win Mod 70 as well as my buddy's Ruger.

72gr is approaching the listed max so start where you feel comfortable and work up from there.

Question on your bedding. Did you bed the lug recess so it's a good tight fit?

If not that can create just enough free play to cause that second round flyer.
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