How much bearing surface?

[Dthomas3523]

.22br with 85.5 Bergers (pictured) and will also be trying 88eld.

Mocking up some dummy rounds for smith to throat for the freebore.

How much bearing surface in the neck is ideal?

Photo also includes about 30gr varget for reference (yes, I cut the case empty first and then dropped powder).

 

[straightshooter1]

I would think the mag length would be a key factor. ?

 

[Dthomas3523]

I would think the mag length would be a key factor. ?

BR case. No issues with mag length.

 

[47guy]

You are about perfect right there...above the doughnut and gives you room to chase the lands...I’ve found less then half the neck unless jammed does not work to well.

 

[Steel head]

Such a cute little thing

I think your bullet placement is perfect.

 

[Dstoenner]

I like at least 1 caliber of bearing surface in the neck if the neck is at least that long.

david

 

[Dthomas3523]

So, here’s what I’ve come up with.

Boat tail junction just above the neck shoulder junction. Bearing surface in neck is ~ +/- .230

BTO with hornady comparator is 1.770

Think I’m gonna go with that, epoxy a few in and send to smith for chamber.

 

[Steel head]

It should be named 22 feisty kitten.

 

[Dthomas3523]

And I’ll probably add .050 to give room to jump bullet.

 

[Steel head]

And I’ll probably add .050 to give room to jump bullet.

Kittens like to jump!