Is Too much up pressure possible?

[jonh172]

Hi all, I need some advice.

I recently made a target rifle out of a sporterised No4 and performed a centre bedding job on it.

The rifle shoots 1.5” 5 shot groups consistently with 2013 mk8z ammo.

I’m curious though, when I bedded the barrel for the up pressure I didn’t use any specific number of pounds of up pressure. I merely shimmed it until I felt there was a good amount of pressure then bedded it.

I’ve had a few groups string vertically when the barrel was getting hot but I was also experimenting with different ammo.

The second link shows a target that had 3 pretty much touching then 4 and 5 strung vertical in order.

Just curious if anyone knows if there’s such thing as too mich up pressure and what the adverse effect would be if so.

Thanks!

Jon

Link to some pictures

https://imgur.com/a/cWxPM7Z
https://imgur.com/a/tsnj1Io

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