Bat M Bolt nose cone depth.. same on all bolts?
- Thread starter LVLAaron
- Start date
Dusty Stevens
Shiner
If its coned and the same boltface size then yes
Alex Wheeler
Site $$ Sponsor
Clearance doesnt change, cone depth does.
LVLAaron
Gold $$ Contributor
Thanks. That's what I was actually asking. Bummer. Glad I asked.
I run this dimension tighter than many. The way I see it is there is no downside to it as long as the two don't come into contact with a sized and loaded round. But when shtf, it's a metering system that has a lot of control over what can come flying at your eyeballs and other parts I'm still fond of. I've never seen a .010 clearance function spilled powder better than .003-.005 yet. The kernels are bigger than either, by quite a bit. Yes, I've dumped the lugss full, just like most of us will do, sooner or later. I see no value in terms of reliability or any other purpose to running this dimension "loose." It's a safety dimension and IMO, should be treated as such...even with a well supported case head. Just my two cents but again...what down side is there?
Very true! Just measure the cone depth above the case od.
Dusty Stevens
Shiner
Remember my solder crush trick? Did you ever get the pma barrel mic to measure the cones?
LVLAaron
Gold $$ Contributor
Trick? No. - Also don't have the pma tool. Was going to make one.
LVLAaron
Gold $$ Contributor
I don't have the mag bolt to fit the cone.
I'll make a few tools like my ez chekrs to measure cone depth with soon. Just haven't decided if I want to do it the cheap way or a little more expensive route. Ultimately, one is as good as the other from what I can tell after doing a couple of different styles.. and the ez chekr will work well, as is, with a 5/8 flat indicator tip and some care in using it. If I do another model for this specific purpose, it'll be to make it pretty much foolproof and if people want it or not.
Ah. The clearance is the same. I think al the 25 degree cones BATs call for the and clearance
LVLAaron
Gold $$ Contributor
I mis-stated my original question. I was looking for the cone depth/size. Mag bolt needs a deeper/larger cone.
I don't follow. They both have the same spec and print. That said, I happen to have a BAT M with both standard and magnum bolts. I also happen to have a barrel stub cut for an M. Is there something I can measure that can help?
Dusty Stevens
Shiner
Bruce has a cad drawing laying this out i bet he will share with you
I recently purchased a mag bolt for M action for a .284 to 300 wsm switch barrel.
Mag bolt will not close with my 284 barrel. The mag bolt cone was contacting the barrel. While the standard bolt cone has .007 clearance between bolt and barrel.
So in my experience, the mag barrel does need a deeper relief (shorter dimension between shoulder and 25° cut).
Mag bolt will not close with my 284 barrel. The mag bolt cone was contacting the barrel. While the standard bolt cone has .007 clearance between bolt and barrel.
So in my experience, the mag barrel does need a deeper relief (shorter dimension between shoulder and 25° cut).
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