Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

Low ES and SD, but accuracy not there

 
LinkBack Thread Tools Display Modes
  #8  
Old 10-29-2009, 07:12 AM
Bronze Member
 
Join Date: Jul 2009
Location: Houston, TX
Posts: 76
Re: Low ES and SD, but accuracy not there

You did not say whose bullets you are using. I have a 24" Kreiger barrel and the SGK 200 gr. like 0.010 off the lands, Barnes 180 gr. TTSX like 0.040 off the lands and I am going to try a load today or Sat., rain & work permitting of Berger 210 hunting VLDs at 0.005 off the lands. Both the Barnes and Sierra's are 0.43" groups at 100 yards with my 300 Win Mag. I hope to improve that too. I find that it is a strange blend of barrel dynamics to find the sweet spot of your gun/load for the right combination of powder and distance between the ogive/land. I found that it is easier to hold one constant and vary the other until you have the right combination. I also spent 30 minutes talking to the specialists at Sierra and they love talking guns, loads and thewill certanly help
__________________
Michael M. Moore
N5RWH
NRA # 166336949
Reply With Quote
  #9  
Old 10-29-2009, 10:59 AM
Platinum Member
 
Join Date: Apr 2005
Location: Alaska
Posts: 3,439
Re: Low ES and SD, but accuracy not there

Quote:
Originally Posted by canderson View Post
You might try one of the 7mm 0.010 into the lands. If you can work the bolt and eject the cartrdige in one piece, it will work for hunting. My target rifle likes the 180's there. Use an OAL length gauge to get the 0.010. My rifle wil pull an unfired case with this little jam. Good Luck.
I shoot both 168 7mm and 210 308 Berger VLDs 0.010" into the lands in my 7mm Rem Mag and 300 Win Mag. VLD have a history of doing well jammed into the lands. I seem to achieve lower ES and SD there than off the lands and I speculate the back press against the lands may help get more consistent rates of powder ignition. Both loads are hunting loads. 0.5 moa or less out to the ranges I shoot. I load these single shot style and both loads will eject unfired rounds with the bullet intact. I do use a Hornady gauge on dial calipers to ensure the seating depth is within +/- 0.0006" simply for consistency purposes.
Reply With Quote
  #10  
Old 10-29-2009, 11:49 AM
Platinum Member
 
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,520
Re: Low ES and SD, but accuracy not there

Low ES's and SD's dont always equal accuracy. Barrel harmonics equal accuracy. You just need to find either a different powder and or powder charge (most likely the charge) and or a different bullet. As stated, seating depth helps too.
Reply With Quote
  #11  
Old 10-29-2009, 12:55 PM
Silver Member
 
Join Date: Apr 2009
Location: western Oregon
Posts: 120
Re: Low ES and SD, but accuracy not there

Yup! It's time for an OBT/OCW session at the range.
Reply With Quote
  #12  
Old 10-30-2009, 11:14 AM
Silver Member
 
Join Date: Dec 2008
Posts: 178
Re: Low ES and SD, but accuracy not there

I developed my load from a ladder test for OCW. As I have read, there were two "nodes" where POI and velocity were close. One was on the lower end of the charge weight, and this load was close to the top. I could try the lower charge weight, but my rifle only produces 2850 shooting the 168VLD with the 70gr load of H1000. I was hoping for more out of the 7mag, but the advertised 24" barrel length includes the muzzle brake, so it's really more like 22" from the bolt face to where the brake starts.

I am using a lee collet die and not much neck tension, much less than my other rifles using FL sizing dies. Will that cause problems trying to edject a loaded round jammed into the lands?

I should be able to shoot this weekend, will keep you posted.
Reply With Quote
  #13  
Old 10-30-2009, 12:04 PM
Platinum Member
 
Join Date: Apr 2005
Location: Alaska
Posts: 3,439
Re: Low ES and SD, but accuracy not there

If the neck tension is too loose, the bullet can set back when it engages the lands, seating depth can change on any rounds in your magazine under recoil, and the bullet could pull out of the case mouth when you try to eject an unfired round. Try loading some rounds and ejecting the unfired cases and see if the bullet comes out with the case, with the muzzle pointed up. If they come out, then measure the seating depth again to see if it's changed from the initial setting. If all looks good, you may have enough neck tension. Also, take a loaded round and try to shove the bullet in deeper with your fingers. The bullet seating depth shouldn't change and the bullet shouldn't move. If it does you don't have enough neck tension for a hunting round.
Reply With Quote
  #14  
Old 11-01-2009, 05:37 PM
Silver Member
 
Join Date: Dec 2008
Posts: 178
Re: Low ES and SD, but accuracy not there

Finally got it to shoot with the 140 ballistic tips. I have a few rounds of factory ammo that shot well, tested that, and it shot .77" when everything else I tried did 1.5 to 2.5"

I tried seating everywhere from jamed .016 to jumping .080 with the VLD's to no avail. I have a precision mic RCBS set and seated the ballistic tips to the same as the factory rounds. (over.100 jump) Finally it shot a nice .88 group with very little vertical.

I haven't tried that with the VDL's I'm tired of load development and with less than a week to opening day, I need to get out and do field practice.

Thanks for all the help.

PS, the 6mm remington worked out with 50.5g of H1000 seating the 95gr ball tips with a little more jump as well. It's always good to have a backup rifle, 2 or 3 is even better.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Low ES and SD, but accuracy not there
Thread Thread Starter Forum Replies Last Post
AR-15 Accuracy Help bookworm Rifles, Bullets, Barrels and Ballistics 19 05-16-2011 09:17 AM
223 accuracy ShortMag3 Reloading 5 05-01-2011 09:22 PM
Help 270 WSM Accuracy, dig Rifles, Bullets, Barrels and Ballistics 11 10-02-2010 02:01 PM
M14 / M1A accuracy Skinny Shooter General Discussion 13 10-01-2009 07:28 PM
.260 accuracy Airborne Rifles, Bullets, Barrels and Ballistics 14 04-28-2004 06:58 PM


All times are GMT -5. The time now is 10:13 PM.


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