In 2003 I spent a lot of money and time not getting a Savage 12BVSS in 223 Rem to shoot accurately. In January 2013 I bought a Savage12FV and have spent the intervening ten months duplicating the ten year old failure. I have a Lyman 225415 mold that doesn't help, and just got a Lyman 225646 that looks to continue the march.
I've considered a Shilen 5.7 X 28 barrel and attendant apparatus, and a 221 Fireball barrel-but came to my senses before the cash went down the swirley.
I think that the problem is the mold design.
The Lyman 31X299 is the best 30 caliber gas checked cast bullet designed to date.
The Lyman 22 designs aren't close.
Enter the 227299.
Let us design a bullet with the advantages of the 31X299, in 22 caliber.
I can't draw, can't cad, (can dance), and know that there's a cad/drawer out there.
Here are some numbers to get us going.
31X299 is about 1.175” long, weighs around 200 grains.
In 22 caliber:
227299
BULLET MINIMUM EST. WT.B.C. WIND DRIFT
LENGTH “TWIST “ GRAINS 31X299=1 31X299=1
1.175 6.4 109 1 1
1.1 6.8 102 0.94 1.07
1 7.5 92 0.84 1.18
0.9 8.3 83 0.76 1.31
0.8 9.4 74 0.68 1.47
0.7 10.7 65 0.60 1.68
0.6 12.5 55 0.50 1.98
0.5 15 46 0.42 2.37
Minimum Twist is Greenhill, Est. Wt. is my estimator.
B.C. is ballistic coefficient. If we call the B.C. of 31X299 1, then B.C. of a 22 caliber version the same length is 1, and B.C. falls as bullet length is decreased.
Wind drift varies as B.C., inversely. The shorter the bullet, the more the wind drift.
So, for my 9” twist rifle, a bullet .8” long weighing 74 grains would have a B.C. = .68 times 31X299 B.C., and wind drift would be 1.47 times 31X299 wind drift.
