by Bills Shed » 02 Mar 2014, 9:51 am
For those that may be interested this little calibre is a beauty.
PLEASE NOTE THESE LOADS WORKED IN MY RIFLE. PLEASE TAKE ALL PRECAUTIONS WHEN WORKING UP YOUR OWN LOADS. ALWAYS START LOW AND WORK UP.
Every group shot was three rounds. All shot at 100m. I am hunting and seldom do I fire five rounds at a time. I fired five round groups when I was getting the better velocity that I was after. On that note there was only one group that went over 1 inch and that was probably my fault. All group sizes are measured centre to centre. Rifle was scrubbed between groups to break the barrel in and ensure fowling was not an issue. Lots of cleaning!!!
I was very impressed with the accuracy from group one. After all the testing I am going to settle on 10 grains of AR2205 under a Hornady 20 gn Vmax. Federal small rifle primer. No excessive pressure signs, powder level is at the bottom of the shoulder, not a compresed load, excellent grouping and hopefully good case life. COL is straight out of the book but will play with it a bit but it must still must work through a magazine. At 0.56" at 100m this is more than enough accuracy for my needs.
All powder was weighed and check weighed on a laboratory analytical balance. I find a powder thrower is only good for about 0.2 of a grain and with these small cases 0.2 is a large discrepancy.
Started with book starting load 11.0 gn of 2207, .728" but with a average velocity of 3055 fps
11.1, 3110 fps, .642". Obturation was poor to average, primers set back slightly and still perfectly formed. Low pressure.
11.2, 3150 fps, 1.2"
11.3, 3182 fps, .803"
Etc. Etc
11.6, 3268 fps, 873". Perfect obturation, primers just starting to loose their roundness at the edges. This was a compressed load with powder right to the top of the neck and still 0.2 grains below ADI Max load.
With the info from Nick Harvey --- All five round groups---
AR2205, 10.0 gn, 3495 fps, .560".
10.1, .665", Chrono failed at this point as the shade came over and would not detect the projectile
etc. etc
10.4, .558"
10.5, .673" five round group, definite pressure signs, no sticky bolt. One sooty primer. defiantly MAX, not a compressed load.
I am not a BR shooter but this little rifle made sub MOA easy. Little to no recoil, low noise and cheap to run. You will get over 750 rounds out of a 1/2 kg tin of powder!
Bill
Last edited by
Bills Shed on 02 Mar 2014, 5:55 pm, edited 1 time in total.
Swaging your own projectiles is the ultimate in flexibility.