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baldie

.224 Valkyrie

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Paddy sent me this pic from SHOT.

Looks like large primer to me.

 

7vplpRZ.jpg

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Just now, The Gun Pimp said:

I don't mind RCBS Dave.

For some reason, i've always had a plethora of stuck cases, and dents , even with the breather hole Vince.

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7 hours ago, baldie said:

Paddy sent me this pic from SHOT.

Looks like large primer to me.

 

7vplpRZ.jpg

 

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Managed to stick 25 rounds down it last weekend.

After the barrel had broke in, the groups started shrinking. This one was half way up a load range, and produced 3150 fps with an ES of 10.

All loads, right up to .1 over max gave no problems at all with extraction. Recoil felt less than a .223, and these speeds were with a 70 grain Nosler RDF.

Having done all that brass prep to the cases, I didn't expect them to be stunning whilst fire forming, but I would live with regular .4" groups out of an AR....especially at those speeds.

I feel better is yet to come on the 2nd firing. Hopefully, brass won't be too long now.

M93mmy4.jpg

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I had to make it Vince, from 6.8SPC and a modified die.

I think the first place it will appear, will be Brownells.

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I tried to get some info on the Valkyrie at IWA but - surprise, surprise - no one has heard of it!

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looks interesting - barrel length/MV relationship a lot more linear than usual

Would 224 valkyrie in an AR be legal in a CSR match or must it be 5.56/223 rem?

Thanks

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17 minutes ago, Hobbit said:

looks interesting - barrel length/MV relationship a lot more linear than usual

Would 224 valkyrie in an AR be legal in a CSR match or must it be 5.56/223 rem?

Thanks

It would be legal in Practical Optic class, but not in Service Optic. Remember that the maximum permitted MV on MOD gallery ranges is 1000m/s (3280 fps), so be careful not to exceed this if using lighter bullets.

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An update on the Valkyrie.

A long and tortuous path. ?

After several range visits, I concluded the 6.8 SPC brass was simply not good enough, and shelved the gun. 

Then good old Gavin at Brownells, let me know some Starline brass was inbound, so I had 500 cases.

This made a big difference, and we experimented with various powders, most of which were just not quite right.

I beat the cfe223 to death [probarbly because I have 10 tubs of it ] ? The yanks keep on about it, but no matter what i did with it, the ES spreads [and groups ] were not great.

Tried a variety of bullets, mainly nosler RDF's in 70 grain and 85 flavour, and got good speeds and accuracy with the 77SMK.

Then Adam at Sassen, asked if I would test them a new cut rifled blank in .224. So on went a 1 in 6.5" twist at 24" this time, so I could see what an extra 4" difference made.

Surprisingly...not a lot in speed terms.

The new sassen cut rifled blanks are something else. The bore is like a mirror.

These patches show what came out, after 100 rds. The last patch had sweets on, and was left to soak . 

No copper whatsoever.

The cartridge is a pernickety little swine, and only likes certain powders, but it seems to handle various bullet weights well.

I found the RDF's definately have a sweet spot, at 0.040" back, and I suspect , 0.050"  will be even better.

Despite my crap bench technique, I have had some satisfactory results now, with two loads shooting around 0.4" .

I think to wring the last out of it, it would need to be bench rested. AR's , off a bipod on a concrete bench , are like a roller skating pig.

Speeds ?

2850 with an 85 grain, and 3050 with a 77.

Couple that with perfect extraction, and you have a very marked improvement over a .223.

The BC's of the 85 RDF's are huge, compared to a SMK, and that translates into less drop, and a lot less wind drift.

I have a fat box of sierra 90 grain matchings come today, so will give these a whirl too.

Many thanks to Adam and James at Sassen, for their help on this project.

A beautiful barrel that just works.

I will now see how it fares in next years Practical class at Diggle.

msa8kGS.jpg

RduEzJ3.jpg

Gs4vzG2.jpg

 

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Hopefully going to test the 90 grain SMK this week.

Other news is that I have some 6.8SPC bolt heads for the Bighorn actions on their way.

Those, coupled with my BR converted mags will make a top end bolt gun possible.

I was having this conversation the other day, when a friend asked ...Why ?  Why not use a 22br etc ?

Recoil.  There is a fair bit less, giving faster target re acquisition .

The valkyrie reamer will handle the 90 grain bullets without throating too.

Having done all this testing on an AR, i'm fairly certain a bit more could be wrung out of a bolt gun.

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