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7mmRemMag accuracy troubles

 
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  #1  
Old 01-17-2011, 08:22 PM
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Join Date: Jul 2010
Posts: 89
7mmRemMag accuracy troubles

I have a Savage 112 BVSS in 7 mag. I did a break-in on the gun, not sure if I needed to but I did it anyways. Today I took the gun out for the second time to try and find a good load for some long range shooting. I loaded 4 groups of 5 shells according to Bergers seating instructions. I also loaded 4 groups of Amax's to the same seating depths.

All groups were shot off a bench at 100 yards.

168gr Bergers
71gr Retumbo
215 Federal Primers
Norma Brass (Fire formed)
Avg 3090fps

The best Berger group was acheived at .040 off the lands and measured a whopping 1.5 inches for 5 shots. The other groups looked like the target had been shot with a shotgun.

162 Amax's
71.5gr Retumbo
215 Federal Primers
Norma Brass (Fire formed)
Avg 3085

Best Amax group was at .080 off the lands and measured .729 for 5 shots.

I was okay with the Amax group, but was really hoping for under a 1\2 moa group.

I've only shot Bergers since I started reloading and have had great luck with them, but I couldn't shoot worth a crap today with them.

I have a little RL22 and H4831sc I could try, but was really hoping Retumbo would work for me.

I guess I'm just looking for some direction on where to go from here.

Sorry for the long post, just really frustrated with something that usually brings me so much joy.
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  #2  
Old 01-17-2011, 09:08 PM
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Join Date: Dec 2010
Location: Central Ohio
Posts: 144
Re: 7mmRemMag accuracy troubles

It would appear to me that your load work-up emphasizes different bullets and distance off the lands. What you really should do is stick with one bullet and seat said bullet as close to the lands as possible while still getting good feeding through the magazine. Load a series of cartridges with incrementally increasing powder charges. I usually load 3 cartridges with each load but if you want to do 5, then more power to you.

Once you've found a powder charge that seems to give the best group, you can play around with distance off the lands or bullet type. If accuracy isn't satisfactory, then do a similar workup with a different powder.

The 162 gr. A-Max with its BC of 0.625 is an excellent long range bullet choice. My 7mm Rem. Mag. load with that bullet and with Barnes 140 gr. XLC bullets utilizes RL-22 over Federal 210M primers (not magnum primers). I get very good accuracy with that combination.
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  #3  
Old 01-17-2011, 09:09 PM
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Join Date: Jul 2009
Location: Idaho
Posts: 580
Re: 7mmRemMag accuracy troubles

I tried several powders and lenghts what i finally ended up with was1 64.5 gr of 4831sc .020 off the lands this load shoot sub moa out to 1000 yards but i stopped using the bergers since they where so hard to find I went back to the Accubond
but Im also trying some 120 gr bullets this week
retiredcpo

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  #4  
Old 01-17-2011, 09:18 PM
Platinum Member
 
Join Date: Jan 2011
Posts: 2,124
Re: 7mmRemMag accuracy troubles

As was mentioned, for the most possible accuracy use 210m's or cci br-2's, not mag primers, and go with imr 4831 or re22. jumping bergers with mag primers and retumbo= why it looked like a shotgun! There isn't any reason that rifle should shoot that bad, unless you got one that someone atempted to wrap around a tree!
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  #5  
Old 01-17-2011, 09:28 PM
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Join Date: Mar 2010
Posts: 54
Re: 7mmRemMag accuracy troubles

I agree with Grumulkin. However I like to work up loads with VLD bullets @ 300 yds +. I have been in the same boat as you. I spent the better part of a summer and alot of money trying to get Bergers to group well at 100 yds. I then started shooting at 300 - 500yds....Wow! it makes a diference. I have a 7mm Rem Mag, Lilja #5, Trued Rem action, and it shoots 0.8" @ 100yds but can consistently shoot 2 - 2.5" @ 500yds!
My go to load:
69.1 gr H1000
Win Brass (neck turn 0.011")
Fed 215M
168 gr BergerVLD
0.035" off lands
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  #6  
Old 01-17-2011, 10:03 PM
Silver Member
 
Join Date: Jan 2011
Location: West Virginia
Posts: 169
Re: 7mmRemMag accuracy troubles

Quote:
Originally Posted by jsimonh View Post
I have a Savage 112 BVSS in 7 mag. I did a break-in on the gun, not sure if I needed to but I did it anyways. Today I took the gun out for the second time to try and find a good load for some long range shooting. I loaded 4 groups of 5 shells according to Bergers seating instructions. I also loaded 4 groups of Amax's to the same seating depths.

All groups were shot off a bench at 100 yards.

168gr Bergers
71gr Retumbo
215 Federal Primers
Norma Brass (Fire formed)
Avg 3090fps

The best Berger group was acheived at .040 off the lands and measured a whopping 1.5 inches for 5 shots. The other groups looked like the target had been shot with a shotgun.

162 Amax's
71.5gr Retumbo
215 Federal Primers
Norma Brass (Fire formed)
Avg 3085

Best Amax group was at .080 off the lands and measured .729 for 5 shots.

I was okay with the Amax group, but was really hoping for under a 1\2 moa group.

I've only shot Bergers since I started reloading and have had great luck with them, but I couldn't shoot worth a crap today with them.

I have a little RL22 and H4831sc I could try, but was really hoping Retumbo would work for me.

I guess I'm just looking for some direction on where to go from here.

Sorry for the long post, just really frustrated with something that usually brings me so much joy.
I actually did almost the very same thing today. Tried seating depths as Berger recommends and none shot very well either. This was also a new (50 break-in shots) Sendero. My best load was seated into the lands but still only shot about 1.5" like you said. I was highly disappointed. All loads were 64gr RL22 and winchester mag primers. I think I am going to try an Amax with H1000 or Retumbo. I have tried Bergers in two guns and neither liked them. I'm not knocking Bergers because people who are much better than I am shoot them but I'm leaning toward the Amax now. Good luck with your loads, and don't get too disgusted because you aren't alone.
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  #7  
Old 01-17-2011, 10:06 PM
Bronze Member
 
Join Date: Jul 2010
Posts: 89
Re: 7mmRemMag accuracy troubles

Thanks for the input guys.

I worked up the 71gr load during break in. All bullets were seated to .010 off the lands and several powder charges were used. None really shot well, so I settled on 71 for no real reason. I didn't dip into the lower powder charges to far, maybe I'll re work the Bergers with a greater range of powder charges.

Is the .729 Amax group decent for a 5 shot group? I'm not really sure what my "goal" should realisticly be for a 5 shot group.

I think I'll leave the Amax load at .080 off the lands and experiment more with powder charges.

I thought about trying some SMK's, but I'm not sure my 1:9.5 barrel will stabilize them.
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