runfiveslittlegirl
08-28-2008, 08:20 PM
All these guns are 765 Argentines, but the they have different barrel lengths.
Rifle #1: 22" Bolt face to end to BBL
Rifle #2: 24" Bolt face to end of BBL
Rifle #3: 29" Bolt face to end of BBL
Load #1: 33.5 grains I 4895 fed. 210 180grain cast jacket.
Load #2: 34.5 grains I 4895 fed. 210 180grain cast jacket.
Test #1 Rifle #1 22" 33.5grain I 4895 fed. 210
1st ten shots no filler
Velocity average: 1873
Standard deviation: 58
Extreme speed: 158
2nd test with filler
Velocity average: 1965
Standard deviation: 25
Extreme speed: 73
Rifle #2 24" barrel
33.5grain I-4895 Fed. 210
Velocity average: 2019
Standard Deviation: 24
Extreme speed: 80
Rifle #3 29" barrel
33.5grain I-4895 Fed. 210
Velocity average: 2135
Standard Deviation: 38
Extreme speed: 95
The 765 argentine with the 22" barrel and 33.5grains of powder that has no filler has a slower average than the 33.5 grain with filler.
33.5grain average in gun #1 was 1965, gun #2 2019, and gun #3's which was 2135. The smallest average was gun #1 which also had the shortest barrel. The fastest velocity belonged to gun #3 with the longest barrel.
Test number one for gun #2's average was 2019 but if you add just one grain of powder more its average picks up to 2037. Taking the Standard deviation from 58 to 50.
After that the cronograph no longer worked, because the sun was going down and there was not enough light. But with the numbers me and my dad collected. The powder going up one grain of powder picked up twenty feet per second.
Thanks for reading! Anyway thanks for all you guys have taught me! =)
Rifle #1: 22" Bolt face to end to BBL
Rifle #2: 24" Bolt face to end of BBL
Rifle #3: 29" Bolt face to end of BBL
Load #1: 33.5 grains I 4895 fed. 210 180grain cast jacket.
Load #2: 34.5 grains I 4895 fed. 210 180grain cast jacket.
Test #1 Rifle #1 22" 33.5grain I 4895 fed. 210
1st ten shots no filler
Velocity average: 1873
Standard deviation: 58
Extreme speed: 158
2nd test with filler
Velocity average: 1965
Standard deviation: 25
Extreme speed: 73
Rifle #2 24" barrel
33.5grain I-4895 Fed. 210
Velocity average: 2019
Standard Deviation: 24
Extreme speed: 80
Rifle #3 29" barrel
33.5grain I-4895 Fed. 210
Velocity average: 2135
Standard Deviation: 38
Extreme speed: 95
The 765 argentine with the 22" barrel and 33.5grains of powder that has no filler has a slower average than the 33.5 grain with filler.
33.5grain average in gun #1 was 1965, gun #2 2019, and gun #3's which was 2135. The smallest average was gun #1 which also had the shortest barrel. The fastest velocity belonged to gun #3 with the longest barrel.
Test number one for gun #2's average was 2019 but if you add just one grain of powder more its average picks up to 2037. Taking the Standard deviation from 58 to 50.
After that the cronograph no longer worked, because the sun was going down and there was not enough light. But with the numbers me and my dad collected. The powder going up one grain of powder picked up twenty feet per second.
Thanks for reading! Anyway thanks for all you guys have taught me! =)