Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics


Reply

7mm Rem Accumark Load Testing

 
LinkBack Thread Tools Display Modes
  #15  
Old 03-14-2010, 10:31 AM
Platinum Member
 
Join Date: Nov 2008
Location: Central Pennsylvania
Posts: 4,029
Re: 7mm Rem Accumark Load Testing

You may want to try some traditional powders like H4350, IMR 4350, H4831, IMR 4831, and H1000, RL19, RL22, and RL25. They are little faster and may provide a little better velocity with out the compaction you are experiencing with the Retumbo. Just a suggestion.

Tank
__________________
Matthew 7:13-14
"Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. [14] But small is the gate and narrow the road that leads to life, and only a few find it.

If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger

Friends don't let friends develop canonitis!-chucknbach

arguing over the internet is like the special Olympics....even if you win, you are still...special!
Reply With Quote
  #16  
Old 03-14-2010, 11:13 AM
Gold Member
 
Join Date: Oct 2009
Location: Arizona
Posts: 783
Re: 7mm Rem Accumark Load Testing

Sorry your right. My coal is 3.368. Thanks for all the help, Im heading to the range right now so Ill let you know how it goes.
Reply With Quote
  #17  
Old 03-14-2010, 04:02 PM
Gold Member
 
Join Date: Oct 2009
Location: Arizona
Posts: 783
Re: 7mm Rem Accumark Load Testing

Went back today. Here is my reslults at 200 yards no wind.

70.7grs- .38" and .55"
73.5grs- 1.68"
74.0grs- 1.25"
74.5grs- 1.29"
75grs- 2.5"



I didnt find any pressure signs but with 75 grains there was a lot of powder crunching so I didnt go any higher. This confirms that my gun really likes the 70.5-71 grain range or so it seems. Berger said that at their 70.4 gr max they were getting 3022 fps.
Reply With Quote
  #18  
Old 03-14-2010, 04:48 PM
Platinum Member
 
Join Date: Apr 2005
Location: Alaska
Posts: 3,364
Re: 7mm Rem Accumark Load Testing

I don't get those MVs at 70 grains of Retumbo, and that seems optimistic. Hodgdon's online data shows 2899 fps for a 170 grain Sierra bullet with 75 gr Retumbo.

170 GR. SIE RN Hodgdon Retumbo .284" 3.270" 71.0 2752 44,200 CUP 75.0C 2899 50,700 CUP

The reason I say Retumbo is going to be about the best powder going for the 7mm Rem Mag with the 168 VLD is because that's the powder of choice for the 'Best of the West' and they also use the 168 Berger VLD. They spent a lot of time with that combination and have stuck with it.

I spaced it that your groups were at 200 yds. I was thinking 100 yds. Your original Ladder test data set is much more reasonable at 200 yds, and I don't doubt their validity one bit. Especially now that you've gone back out and duplicated the good performance at the same two powder charges as the first group.

You've just successfully implemented the Ladder method of load development. Wasn't as hard as you thought, eh? You'll continue to increase confidence in those powder charges with additional shooting.

You've got a good load at ~70 grains and another good load in the 74-74.5 grain charge, which is about where I load (74.6 grains).

Thanks for the follow-up post. It doesn't always come around so quickly, and it doesn't always work as slick as your first experience. You must be a pretty good shooter to duplicate the data so closely - it wouldn't appear you're shooting is problematic. This method of load development is a reasonably efficient way to hone in on better, rather than worse, loads for a rifle.

I'd be pretty happy with the accuracy even at the 74-74.5 grain load. If you're gonna shoot at game at 800-900 yds, now you just need to confirm similar retained accuracy (moa-wise) at those extended ranges.

Cheers!

Last edited by phorwath; 03-14-2010 at 04:55 PM.
Reply With Quote
  #19  
Old 03-14-2010, 05:53 PM
Gold Member
 
Join Date: Oct 2009
Location: Arizona
Posts: 783
Re: 7mm Rem Accumark Load Testing

When I get a chance Im going to chrony it to double check. Thanks for all the help and suggestions. Down the road ill tweak with the charge etc but for now Im satisfied. I agree that the other loads shoot pretty good too. Its still well under 1 moa. Thanks!
Reply With Quote
  #20  
Old 03-14-2010, 06:15 PM
Gold Member
 
Join Date: Oct 2009
Location: Arizona
Posts: 783
Re: 7mm Rem Accumark Load Testing

Liltank, Thanks for the suggestion. I only have Retumbo and H1000 at the moment and now that I found my gun likes it pretty good I think ill stick with it. If I try a different powder it would be like starting all over again. Like I said earlier I dont like to mess around much. Once I find a load my gun likes I stick with it. But thanks for the idea if anything down the road ill try some h1000 and see how it goes. Thanks
Reply With Quote
  #21  
Old 03-14-2010, 06:39 PM
Platinum Member
 
Join Date: Nov 2008
Posts: 1,047
Re: 7mm Rem Accumark Load Testing

Good to see you got much better results on Day 2. with no wind.
Day 1
69.5grs - 3.9"
70.grs- 2.7"
70.5grs- .9"
71.0grs- 1.3"
71.5grs- 5"
72.0grs- 5.4"
72.5grs- 2.4"
73.0grs- 3.1"
73.5"grs- 1.8"
Day 2
70.7grs- .38" and .55"
73.5grs- 1.68"
74.0grs- 1.25"
74.5grs- 1.29"
75grs- 2.5"

Pitty that you didn't shoot the 71.5 and 72gn loads again. I would not be surprised if these loads also shot much better. Sample size is important in order to get a true feeling for what load your rifle likes.
Having said that, it looks like from your results that you have at least one accurate load that you can use. So that rifle can shoot quite well.
A change to a faster powder might give you higher velocities and good accuracy.
Good luck.
__________________
scientia est potentia
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: 7mm Rem Accumark Load Testing
Thread Thread Starter Forum Replies Last Post
Load testing my Rem Tactical in .223 Mike6158 Reloading 8 01-22-2011 09:51 PM
A bit of load testing .308 win Varmartin Reloading 23 04-11-2010 11:19 PM
Load testing ICANHITHIMMAN Reloading 5 10-14-2008 10:04 PM
Load Testing Distance ktmhk53 Rifles, Bullets, Barrels and Ballistics 4 05-17-2004 03:39 PM
Load testing question Rifles, Bullets, Barrels and Ballistics 1 02-02-2003 11:17 PM

Current Poll
Spot & Stalk or Ambush For Western Deer?
MOSTLY - Spot & Stalk - 73.73%
1,027 Vote
MOSTLY - Ambush - 26.27%
366 Votes
Total Votes: 1,393
You may not vote on this poll.

All times are GMT -5. The time now is 08:30 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC