AusVarmint

204 Hunter

It feeds just fine out of the 85 mag, the projectile has about 2mm clearance from the front of the mag.
I have some 32s loaded but haven’t tried them yet.
I don’t have records of velocities from the original 204 barrel.
Hope to give it a run as soon as summer moves on.

204 Hunter

Maybe the less than expected increase is because I measured a standard 222 case with the 22cal neck
While the shoulder moves forward the neck size is reduced
Either that or I measured wrong?
I’ll do another check soon

204 Hunter

Single shot?
Borden have a nice dasher compatible repeater

204 Hunter

I have some 32s to try, but don’t think I’ll try the 40s as I have plenty of 39s

204 Hunter

Barrel is a sporter weight maddco 22” with a 12 twist
75 sako profile which is a little heavier than the 85 so had to open the barrel channel to suit.
I wanted it as close to the standard sako barrel as possible as I think it’s about perfect for a spotlight rig

204 Hunter

Did a little testing today

23gn of BM1 gave 3650 with 39gn sierras
3 shots 8mm at 150yds
23.5 gave 3730 but primers were flattening out a bit, cases showed no sign of sticking.
With similar grouping

I think 23gns might be the go

204 Hunter

trevort wrote: ↑Sun Dec 08, 2019 4:13 pm Can you not get a false shoulder going from 22 to 20?

I just followed another thread on here using that procedure, I have a 6mm mandrel so easy to do.

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204 Hunter

Got the better of me...
The 204 short has 1 gn more of water than a standard 222
27.2 in a 222
28.2 in my 204 short
I used an A&D scale

204 Hunter

The 204 short holds 1.6gns more of BM1 than a standard 222
I’ll do a water check sometime

204 Hunter

I’ll check soon

204 Hunter

D2D22298-EF91-4798-B337-3CD3D45D5A83.jpeg I ended up getting Matt P to run a 204 reamer in short to suit a 222 case. Pic shows 222,222 necked up to 6mm, sized to 20 cal,annealed case, loaded case, fire formed case loaded. 21gns of BM1 gave approx 3400fps with a 39gn - room for improvement I’m hopin...

204 Hunter

A buddy of mine put about 4000 or so in a plastic cylinder and thought I should shoot it...
It went off way better than I thought it would
I turned around to see him laughing his head off with the sound of primers hitting the hut roof.
The smoke plume was impressive too.
Don’t try this at home

204 Hunter

Thanks for the advice
I’ll give it a go

204 Hunter

I decided to try a 204-222 which means I got my smith to run the 204 reamer in to suit 222 brass
This will be a little different to a 20-222 but would someone recommend a start point and powder?
I have 2206H
Projies I have are 39gn speers
Thanks

204 Hunter

trevort wrote: ↑Thu Oct 31, 2019 10:57 pm Yes but I pushed the shoulder back 30 thou by shortening the 204 fl die

It’s called a JAB 20

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The neck length on the 204 and 223 look much the same
Did you make a custom reamer?

AusVarmint

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