Snowpeak M60B POI adjustment in the cold

[Max115]

I shot my M60B a couple of days ago and found out my POI passed 50 yards and beyond were much lower than before. I checked the speed of the projectile and found out the velocity had dropped 32 fps to 888 fps from 920 fps in May.

After inputing the data into the Element Ballistic Calculator, I was able to find the new POA for the ranges I was shooting at. A few starlings got dropped.

Enjoyed.

 

[Firewalker]

The regulator full broke in?

 

[Dr. Kralenstein]

The regulator full broke in?

He just needs to do the valve mod. That should give him that 32 fps back no problem!

 

[Max115]

@Firewalker. I have been shooting this gun since Feb of this year. I haven't adjusted the Reg or HS yet. I got great accuracy with the NSA 17.5gr slugs so I just left it as is.

@Dr.Kralenstein. I have been reading up with the discussion you guys had on these mods. Very interesting.

 

[Dr. Kralenstein]

@Firewalker. I have been shooting this gun since Feb of this year. I haven't adjusted the Reg or HS yet. I got great accuracy with the NSA 17.5gr slugs so I just left it as is.

@Dr.Kralenstein. I have been reading up with the discussion you guys had on these mods. Very interesting.

For a 22, I think it'll be way over kill. The ports are .250 on the valve.

I would say since you haven't adjusted anything, the reg has finally settled and/or the hammer spring has lost some energy. Could try a half turn in and see what happens.

 

[Max115]

@Dr.Kralenstein. I might try to adjust the HS if I don't get the accuracy as needed. Thank you for the suggestion.

 

[BlackICE]

I had a similar experience with 2 guns. I haven't shot any targets for a while with them, only blasting pests. When I did a target session not only was the groups very poor, the velocity was lower and the ES was huge compared to what I remembered. I had to change the o-rings the regulators.

 

[Max115]

@BlackICE. Not sure if you actually need to change the O-rings. Temperature does affect the velocity of the projectiles. Depends how much speed was lost and adjusting the HS or Reg will get some of the speed back.

 

[BlackICE]

The ES was all over the place and the group sizes were more than 2x worst than before. After change the o-ring accuracy and low ES returned.

 

[Max115]

The ES was all over the place and the group sizes were more than 2x worst than before. After change the o-ring accuracy and low ES returned.

Ic. Glad you sorted that out. I will keep that in mind, thanks.