Oops… moderator can you move this to the general discussion. Sorry and thanx!

I'm *very* slowly putting together a 6mm 'Bee',  but it's scaled up to use a 357 Max case so it looks like the 218 from a distance. Slightly improved a tick less body taper and a 20° shoulder. Want it to look old'ish.

Anyway, I picked a 12 twist barrel with the idea I wasn't going to shoot heavier bullets in it anyway. Maybe 75gr at the most. I've run some calc's on stability and found it might be marginal with some of them. I think the Sierra 85 was likely a no-go.

The BR guys are running stubby 65-68gr bullets, and they're marginally stable from a 14 from what I've read. A really cold day will kill you. Walking the edge, you sometimes fall off.

JBM has a calculator to play with, and a great data base of bullets. Fun way to waste away some time on a rainy day.

If you will look back a little bit, you will see that "singleshotsam" is working on a 22/357 max, forming it with a 222 die. The end result is a short neck(about like a 223),  222R.
A 6mm version of the same cartridge should be a rimmed version and ballistic twin of the bench rest cartridge known as 6x43 or 6mm222

Yeah, my No3 Hornet and No1 Bee both love the 40 VMax too.

I'm also going the way of preferring smaller cartridges. Getting to the point where anything bigger than an '06 is gonna gather dust, so may as well get rid of it. I took my 458 out a couple years back to let a friend try it. One shot and my neck was bothering me for weeks.

I had a .22-.250 Model 70 Varminter a half century ago. This was one of the first post-64 rifles. It was frustrating, shooting different weight bullets dependent on the temperature. Below 40 degrees, the Sierra 45 grain high-velocity; between 40 and 75 degrees, the Sierra 53 grain benchrest bullet; above 75 degrees the Hornady 53 grain hollowpoint. 

At the suggestion of a good friend and seasoned shooter, I sent the rifle to A&M in Arizona to have the barrel bored to 6mm with a 1:12 twist. The thought was the boring and rifling would relieve the unknown stresses and solve the temperature problem. This rework fixed the rifle, but the 1:12 twist would never shoot any bullet heavier than 85/87 grains without a flyer or two.

ISS, sent you a PM.

I have no interest shooting anything heavier than 75-80gr. I just bought (2) boxes of 6 mm Nosler 55gr ballistic tips and have a pretty good stash of 75gr VMax, hence this rifle build.