POI increase in a Sheridan Blue Streak

[JimQwerty123]

I was shooting indoors yesterday with my Sheridan Blue Streak at 3 pumps each. After 30 to 35 shots the POI rose about about 1/4 to 1/2". The gun is scoped because I can no longer see the front sight. I'm very badly nearsighted. I was shooting 20 cal JSBs.

Is this because I had warmed the gun up from all of the pumping?

Thanks,

Jim

[Rob112o]

Yes, there is a difference in FPS as the rifle warms up. I noticed a higher FPS when I'm doing testing at 8 pumps. By the 4th shot (32 pumps) the increases top out and you get an even string from there. I haven't seen an increase more than 20 usually in the teens. So when I do testing I'll shoot a few off the chrony before I start recording numbers.

[Rob112o]

What's your distance you are shooting? Where are you zeroed at? Cause technically your POI should drop with increase in speed.

[JimQwerty123]

What's your distance you are shooting? Where are you zeroed at? Cause technically your POI should drop with increase in speed.

I'm usually zeroed in at 20 yards with 5 pumps. Because I'll be going to work in the dark and getting off in the dark for the next several weeks, I rezeroed yesterday at 10M with 3 pumps to shoot on my indoor range.

Thanks,

Jim

[JimQwerty123]

After last night's shooting session, I believe my problem on Sunday night was the idiot behind the gun (me).

Thanks, all, for your responses.

Jim

[Rob112o]

Adult beverages? That's the leading cause of my issues.

[JimQwerty123]

Adult beverages? That's the leading cause of my issues.

No adult beverages. Probably 12+ hour work day for the 7th day in a row plus a couple gallons of coffee. Took off early last night - only worked 10.

Jim