.300 WM Won’t Chamber Factory Ammo

[AK.300]

Sorry, but eyeballing can be deceiving. You need actual measurements of the ones that chambered fine vs. those that will not chamber. My best WAG is a lot longer than a .003" difference.

View attachment 492895
View attachment 492896

For obvious reasons, the second picture will not chamber. Good luck!

That gauge looks pretty handy, will be picking one up.

Just got a press on the way and going to start collecting the rest of the stuff so can be ready to reload before youth rifle season in mid-Oct.

 

[AK.300]

I was gonna suggest checking the OA case length, as possibly too long!

But, Chad covered that early on!

If you have access to a "go - no go" gauge set, you may check the chamber….it may be a bit tight for a round that's on the high side of spec's! memtb

Don't have a go/no-go but the fact that the suspect ammo would chamber in another rifle, albeit barely, makes me think maybe the chamber may also be a bit tight. Something to figure out for sure before working up a reload for that rifle..

 

[Bob Wright]

Belt to head* dimension is .212-.220 per SAAMI (.220 -.008)

*edit