slimjim wrote: | ||
Caliber _ 0.243 Inches Bullet Weight _ 75 Grains Bullet Length _ 0.942 Inches Barrel Twist _ 12 Inches/turn muzzle velocity _ 3620 fps Temperature _ 68 degrees Fahrenheit (59 is standard) Pressure _ 29.92 inches of mercury (29.92 is standard |
tcknight wrote: |
I see what you are saying but something is wrong either here, or with my original calculation. |
chambered221 wrote: |
Sooooo !!! Would you say a stability factor of 2.123 is to high and should not merit usage ??? |
slimjim wrote: | ||
Tim, you are correct. Thanks for the detail and keeping me straight. |
slimjim wrote: |
General hunting to 500m/yds - S/F greater than 1.4 is required. There is no upper limit to the S/F here. If this bullet does not meet the requirement, use a shorter bullet. Long range beyond 500m/yds - S/F greater than 1.1 is required but more than 1.5 is not desirable. If this bullet S/F is too high, use a longer bullet. If too low, use a shorter bullet. The spreadsheet only states that accuracy may improve if the stability factor is less than 2. "Sg shouldn't be less than 1.4. If Sg is greater than about 2.0, you may gain some accuracy by going to a slower twist barrel." |
fnuser wrote: |
exit wound from a 100g barnes from a 25-06 from @200 yrds |
fnuser wrote: |
it hit the eye on the other side entered the skull and this is a picture of the EXIT |
slimjim wrote: | ||
fnuser, can you provide some specifics. what is your twist rate? what is your muzzle velocity? do you remember how cold the day might have been? I couldn't see any "bands" on the bullet. What is its date of manufacture? Was it a ballistic tip? I ask because Barnes has changed the metallurgy to promote better expansion. If you have bullet length that would be good but I may be able to get it if you have the bullet specifics. |
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