.20-222 load development

[223 fanboy]

I think 23.2gn might be the load.Marcus

They all look good!

[Camel]

Good stuff Marcus, they look much better than the phone photos from last night.

Any idea on speed. And you really must try a little harder to get the fourth shot into the group.

[bigfellascott]

What's the brand of barrel you plumbed into the Sako action Marcus? shoots well whatever it is.

[Branxhunter]

What's the brand of barrel you plumbed into the Sako action Marcus? shoots well whatever it is.

Pac-nor - back story is here:

viewtopic.php?f=61&t=22095

The stock is still a work in progress....

Marcus

[Branxhunter]

Any idea on speed. And you really must try a little harder to get the fourth shot into the group.

No idea on speed. I think the Hamilton rifle club has a chrony so will have to head out there one Saturday morning.

The primers and bolt lift were all OK so loaded up one case each at 23.8gn, 24.1gn, 24.4gn and 24.7gn and shot them for signs of pressure before I went ahead in loading for groups, this was the result:

image.jpeg (99.58 KiB) Viewed 1275 times

Primers and bolt lift still all OK so still room to move.

Yes the fourth shot is a little annoying (I think it was number 2 or 3 here) - perhaps a sign of short concentration span

Marcus

[223 fanboy]

There's your load right there; 24.3 plus or minus half a grain

Seriously though, it'll be difficult to pick any one load over another. They're all good.
Are you thinking of comparing loads at longer than 100m?

[Camel]

Yeah, that will do, just pick a number and go with that, 23.0 is a nice round number. Its about time we started to see some dead stuff, before you wear out the barrel.

[Branxhunter]

Its about time we started to see some dead stuff, before you wear out the barrel.

Used it to add to the fox tally last night. Very happy with how it performed. Will update the forum tally a bit later

Marcus

[Camel]

Good shit mate.

[Branxhunter]

Are you thinking of comparing loads at longer than 100m?

Here you go Clive.

image.jpeg (115.67 KiB) Viewed 1238 times

200m:

image.jpeg (136.33 KiB) Viewed 1238 times

250m (POA was the top of the yellow gong):

image.jpeg (131.7 KiB) Viewed 1238 times

Marcus

[223 fanboy]

Bugger! Those groups just won't open up no matter how far back you go.

Just keep posting things up Marcus. I can't add anything useful, but like seeing how accurate that thing is.


Must ... resist ... 20 cal ... must ... resist ... 222 ... parent cartridge.
Must ... resist ... re-barrel.

[trevort]

Nice when it all works!


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[Branxhunter]

This probably won't help then Clive.

So far I have shot thirteen 4 shot groups with AR2207 for an average group size of 0.57".

I have shot ten 4 shot groups with charges of BM1 ranging from 22.0gns up to 24.7gns (fills about 2/3 up the neck, with the only pressure sign being a very slight cratering on primers) for an average group size of 0.45". If I ignored those annoying driver-induced flyers in a lot of the groups and took the overall average for the best 3 shots of each group it is 0.20".

This seems to be a very forgiving rifle to load for - whether it is due to the .20 cal bore, the .222 parent case design, or just the quality of the barrel plus chambering/crown job I have no idea. I suspect the latter, and that if you had Jerome put together a .223 barrel for your Tikka you would probably see similar results.

Marcus

[Branxhunter]

Nice when it all works!


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Trev, I now know why you guys get nice shiny custom barrels. I have already been bitten badly by the dreaded customwalnutstock bug, and while my immunity is still low I've now been stung by the smallholeshootingbarrel bee. It might be terminal.

Marcus

[trevort]

Marcus there is no cure. Lackoffundsicillin provides temporary relief but as soon as that drug stops being taken the illness roars back into action


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