Tune a load

F

Fla mac

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All,
Does anyone know were the article is about how to tune a load for your rifle. I think I saw it on Benchrest Central but I can not find it. The article started with everything being unknown . If I remember there are two nodes of accuracy. It tell about shooting a 5 shoot group, I think it starts with the bullet just touching the lands and you work with the powder weight, then you go to the load length. If anyone knows were it is located please let me know. It was a very good article.

Fla mac
 
Mac

I dont know about the article but this is how I do it (I'm not recommending this just telling my method) 1st find the jam length of my bullet and set my die .003 deeper(so there is no chance of pulling a bullet in my bbl) 2nd, I load 3 cases each of 28.0 28.5 and 29.0- 133 . 3rd test those in light conditions (not still). I then adj the charge of the best of those down and if there is no pressure signs, up .3 gns at a time. When I find the right charge I start seating the bullets in .002 till I get the best group. Then its time to test with 5 shot groups. You will find it necessary to tweek your pet load for varying conditions. The nodes are usually 1.2 gns apart but I never go there without working up real careful to watch for pressure signs. I usually shoot between 28.7 and 29.2 gns with the bullet showing a faint rifleing mark. Some of the better shooters may give you some better advice
 
Mac ...

Here is my summary of an article I read in The Benchrest Shooting Primer:

"Scanning" For The Right Load …. by Lee Euber, pages 197-198

1. Polish bullet with steel wool. Initial seating depth achieved when bullet is marked by all lands. [Tony Boyer likes to see a “square,” page 58, upper right]

POWDER

2. Load 3 cases in a low grain load. Increase each 3 case load by .5 of a grain, and then shoot. Increase loads until primers show pressure.

3. Identify shots that grouped well, not so good, and then good again.

4. Pick load that shot the best. Load 3 cases with .1 grain less, and 3 with .1 grain more, for another comparison.

5. After picking charge for use, load 30 cases with the same powder charge.

SEATING DEPTH

6. Load the 30 cases in groups of 3, increasing the seating depth from touching the lands to jumping about .040 of an inch, in increments of .005 of an inch.

7. Shoot all 30 rounds without cleaning or clean after each 10.

8. Use ONE fouling shot after each cleaning.

9. Select load that shot best. Load 5 cases with that powder charge and seating depth.

10. Load 10 cases, 5 with seating depth .005 less than benchmark figure and 5 with .005 more.

11. Can compare more than once or change seating depth by .001 or .002.

12. Once you’ve picked the best seating depth, load 15 cases at that depth.

POWDER

13. Check first test by varying charge by .1 grain, for each 5 shot group.

14. Shoot in a medium wind condition, letting the gun do the work.

SEATING DEPTH

15. After picking the best load jumping the lands, compare it with the load that touches. Compare these loads again and again, on different days, in varying conditions, deciding which one is best.

16. If it doesn’t shoot to your satisfaction, restart with a different powder.

NECK TENSION

17. If you decide on the load that puts the bullet in the lands, be sure neck tension is tight enough to hold the bullet uniformly.

18. Its hard work if you want to go to matches and be in contention.

Hope this helps. Art
 
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