Issue: drastic velocity changes
Rifle: JSAR Raptor/30 cal
Projectile: JSB Exact/44.5 grain
Temperature: 32-38 degrees F.
Background:
This rifle, recently out of storage, shot relatively consistently for five or six trips to the range, with velocity’s in the 890-905 range. Accuracy was not particularly good, hence I intended to tune it a bit in hopes of tightening groups, which were about 2 MOA @ 50 yds. Temperature’s then we’re in the mid 40’s.
The morning I was to start on it was colder, about 32 degrees.
Velocities were approximately 450-500 fps. I had not made any adjustments to regulator pressure (1900 psi) or hammer spring tension yet, and the reservoir pressure was 3500-4000 psi, unchanged from the earlier shooting sessions.
Thinking I may have a glitch in my regulator, I depressurization the reservoir (twice), gently tapping the regulator with a plastic tool handle before refilling.
The next day I increased reg pressure to 2200 psi an increased hammer spring tension adjustment about two revolutions.
This increased velocities to 850-910 fps.
I am admittedly inexperienced in this business, but it doesn’t take a rocket scientist to know that is way too much spread.
Do I need to upgrade from a Ninja Paintball regulator to a better unit? No other controls were manipulated. I’m in the dark in Montana. Thank you.
Rifle: JSAR Raptor/30 cal
Projectile: JSB Exact/44.5 grain
Temperature: 32-38 degrees F.
Background:
This rifle, recently out of storage, shot relatively consistently for five or six trips to the range, with velocity’s in the 890-905 range. Accuracy was not particularly good, hence I intended to tune it a bit in hopes of tightening groups, which were about 2 MOA @ 50 yds. Temperature’s then we’re in the mid 40’s.
The morning I was to start on it was colder, about 32 degrees.
Velocities were approximately 450-500 fps. I had not made any adjustments to regulator pressure (1900 psi) or hammer spring tension yet, and the reservoir pressure was 3500-4000 psi, unchanged from the earlier shooting sessions.
Thinking I may have a glitch in my regulator, I depressurization the reservoir (twice), gently tapping the regulator with a plastic tool handle before refilling.
The next day I increased reg pressure to 2200 psi an increased hammer spring tension adjustment about two revolutions.
This increased velocities to 850-910 fps.
I am admittedly inexperienced in this business, but it doesn’t take a rocket scientist to know that is way too much spread.
Do I need to upgrade from a Ninja Paintball regulator to a better unit? No other controls were manipulated. I’m in the dark in Montana. Thank you.
