.22 br

[Potsy]

Thanks to Padom for providing some numbers, I did some quick math based John Barsness’s rules regarding capacity and pressure for a .22BR vs. Hogdon’s .22 ARC data for Ramshot Big Game and a 85.5 Berger.
Found a half decent node at 32.1 grains for 2,973fps out of a 24” barrel (Bartlein 1:7”, 5R, suppressed).

 

[RifleMN]

Quick question, what are folks seeing for loaded neck diameter with Lapua brass? (No neck turning)

 

[westsidecamper]

I'll check for you when I get home

 

[KnowNothing256]

Quick question, what are folks seeing for loaded neck diameter with Lapua brass? (No neck turning)

Lapua brass in 6BR runs about 0.029” total neck thickness. So loaded diameter is right around 0.253”.

 

[4O6shootist]

Quick question, what are folks seeing for loaded neck diameter with Lapua brass? (No neck turning)

My 22br in some older lapua brass is 0.2515 loaded.

 

[padom]

Here is my measurements I posted previously in this thread.... I used a mic to measure everything, not calipers.. so much more accurate. Loaded neck with lapua and 90smk for me is 0.249" measured with a Mitutoyo mic...

""After running my 4x 6BR Lapua brass through the final .249 bushing...my sized neck measures .246.... I measured it 3x with both Mitutoyo calipers and my Mitutoyo micrometer... I then took 1 of the pieces of brass and ran it through my 21st Century TiN turning mandrel which brought me to .247... I left the other piece of brass sized with just the .249 bushing..

I loaded both pieces of brass with a 90smk... I get a measurement of .248 loaded neck diameter... So with the .249 only bushing, that leaves me .002 neck tension... With the mandrel, leaves me with .001 neck tension. So Ill size the rest of the 100pc box of brass down with a .247 bushing then use the mandrel to open back up .002 to give me a final neck tension of .002...."""

 

[RifleMN]

I appreciate the replies. Next question, would anyone feel uncomfortable using rifle chambered with a .260 neck for 22BR? I have done a little research on the subject and it seems like excessive neck clearance is not bad and sometimes can have a positive effect on accuracy. Thoughts?

 

[padom]

I appreciate the replies. Next question, would anyone feel uncomfortable using rifle chambered with a .260 neck for 22BR? I have done a little research on the subject and it seems like excessive neck clearance is not bad and sometimes can have a positive effect on accuracy. Thoughts?

I would say 0.260 neck is excessive... Thats going to overwork your brass which in turn will reduce your brass life and could effect accuracy after a few firings working that brass that much.. I mean not only is it going to blow up excessively, then you gotta size it way down excessively to get it back down to where you can seat a bullet...

My 22BR reamer has a 0.255 neck, thats also what I see Manson's 22BR is spec at, and PTG 22BR reamer is spec at 0.254 neck. Everything I have seen is in that 0.254-0.256 range.

The goal is to work the brass as little as possible...

 

[westsidecamper]

brand new lapua brass, formed and loaded as dummy cartridges: .249
shot a few times and reloaded: .2495-.250
i'd account for .250