.195 bolt in a .177?

[Blutroop]

So I was going through my project guns as they are harder to find up here and started tinkering with a crosman model 70.

After trying to recrown 3 times and still having a tight group the size of a dinner plate I gave up on that barrel.

While thinking about a caliber switch I notice the bolt is big. When I measured I got .195 just behind the probe and before the oring. Feed ramps can literally take a 22!

So now I’m curious..
I tried the bolt in a marauder barrel with oring. I’m thinking I can adjust headspace so the 2 o rings are tight against each other.

I know what happens when you double gasket a oil filter on a engine but am still curious to know if this will work to seal the bolt? What do y’all think? It’s co2 so not practical to go above 1800psi

[Motorhead]

If radial clearance is excessive an o-ring generally with blow out threw the gap.  Harder durometer material can help, but even then a crutch to incorrect sizing specs.