Anschutz 9003 pellets velocity
Moderators: pilkguns, Marcus, m1963, David Levene, Spencer
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Victor
Anschutz 9003 pellets velocity
What is the right pellet velocity for Anschutz 9003? How much is the normal change of velocity between shots? Yesterday I was shot couple of HN Finale match with following velocities 173,3 174,1 170,0 171,1 172,2 171,8 171,7 170,6 171,3 171,8 171,7 171,8 171,8 172,6 170,8 171,6 170,0 170,3 170,1 171,3 171,1 170,6 170,1 170,7. Is this normal or do I need maintain or adjust my rifle? This pellet has not tested and I don´t know test patterns for pellet.
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ishoottrap
- Posts: 32
- Joined: Sun Feb 14, 2010 2:44 am
Here are the stats from your measurements:
171.3 average
1.053 std dev
4.100 spread
0.61% std dev as % of average
2.39% spread as % of average
Spread is maybe a tiny bit more than I'd expect with properly fitting pellets but it's not really significant. This amount of variation will be swamped by aiming factors, your time is spent much more effectively by practice with this amount of consistency.
-Scot
171.3 average
1.053 std dev
4.100 spread
0.61% std dev as % of average
2.39% spread as % of average
Spread is maybe a tiny bit more than I'd expect with properly fitting pellets but it's not really significant. This amount of variation will be swamped by aiming factors, your time is spent much more effectively by practice with this amount of consistency.
-Scot
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ishoottrap
- Posts: 32
- Joined: Sun Feb 14, 2010 2:44 am
The speed of the pellet from all PCP rifles depends on 2 factors:
1) The pressure of the air at the valve
2) The duration of the valve opening which is a function of the pressure of the air and the energy of the striker.
The pressure of the air on target guns and many high end PCP field guns is regulated down from the pressure in the reservoir. There may or may not be any adjustment possible via the regulator but without a change in the striker energy, changing the regulator setting typically does not affect velocity by any significant amount since the interaction of the pressure of the air on the head of the valve counteracts the increase in pressure by reducing the dwell time of the valve.
Adjusting striker energy is the most common method for adjusting velocity of PCP guns. This is typically accomplished by adjusting the pre-load on the striker spring. The exploded view of the 9003 found here:
http://jga.anschuetz-sport.com/index.ph ... &sprache=1
appears to have a striker pre-load adjustment screw (number 97 on the diagram). Without actually having the mechanism it's a bit more difficult to tell whether this is meant to be adjusted or has a stop and the pre-load is set via different thickness washers (96) or different spring (95). Looks like the screw is located behind a plug, I'm guessing that the velocity of the gun is adjusted via this screw. Judging from the relative sizes of the components shown on the diagram, there won't be a lot of adjustment range.
Good Luck,
-Scot
1) The pressure of the air at the valve
2) The duration of the valve opening which is a function of the pressure of the air and the energy of the striker.
The pressure of the air on target guns and many high end PCP field guns is regulated down from the pressure in the reservoir. There may or may not be any adjustment possible via the regulator but without a change in the striker energy, changing the regulator setting typically does not affect velocity by any significant amount since the interaction of the pressure of the air on the head of the valve counteracts the increase in pressure by reducing the dwell time of the valve.
Adjusting striker energy is the most common method for adjusting velocity of PCP guns. This is typically accomplished by adjusting the pre-load on the striker spring. The exploded view of the 9003 found here:
http://jga.anschuetz-sport.com/index.ph ... &sprache=1
appears to have a striker pre-load adjustment screw (number 97 on the diagram). Without actually having the mechanism it's a bit more difficult to tell whether this is meant to be adjusted or has a stop and the pre-load is set via different thickness washers (96) or different spring (95). Looks like the screw is located behind a plug, I'm guessing that the velocity of the gun is adjusted via this screw. Judging from the relative sizes of the components shown on the diagram, there won't be a lot of adjustment range.
Good Luck,
-Scot