22 Hornet to 17 Hornet

[vonrang]

[Bill K]

Those look just like mine. I originally bought some ready to fireform and load, but am now sizing down my own, as you are doing. Work just fine. Bill K

[vonrang]

I have a 17AH set from CH4D that has an intermediate die for knocking the case down from .22 cal to .20 cal.

I then use a full length 17 Hornet die (Hornady) to neck down to .17 cal and push the shoulder back.

I trim the cases a bit longer than 1.340 so that on fire forming the neck pulls back to 1.340 (there was some trial and error to get dialed in).

Winchester 22 Hornet brass did not need annealing, but PRVI brass needs annealing post forming, prior to fire forming.

I fire form with a case full (compressed load) of 4198.

Here is a comparison photo of the converted brass and a hand loaded 17 FB

[hemiallen]

Originally Posted by vonrang

I have a 17AH set from CH4D that has an intermediate die for knocking the case down from .22 cal to .20 cal.

I then use a full length 17 Hornet die (Hornady) to neck down to .17 cal and push the shoulder back.

I trim the cases a bit longer than 1.340 so that on fire forming the neck pulls back to 1.340 (there was some trial and error to get dialed in).

Winchester 22 Hornet brass did not need annealing, but PRVI brass needs annealing post forming, prior to fire forming.

I fire form with a case full (compressed load) of 4198.

Here is a comparison photo of the converted brass and a hand loaded 17 FB

That looks like a 17 hornet along side of a 17 FIREBALL?

[vonrang]

Yes, this is the 17 Hornet (Hornady) formed from 22 Hornet brass next to a 17 Remington Fireball for comparison.

[Tilleyman]

I trim the cases a bit longer than 1.340 so that on fire forming the neck pulls back to 1.340 (there was some trial and error to get dialed in).

Winchester 22 Hornet brass did not need annealing, but PRVI brass needs annealing post forming, prior to fire forming.

I fire form with a case full (compressed load) of 4198.


Great info thanks... I am keen to start making up some 17 HH cases myself

Just got a Bullberry double ended neck forming die (.20/.17) and ran a couple of annealed cases through, followed by a final FLS using the Hornady die.

Came out quite well but wasn't sure how long to trim the cases... could you please advise how much longer than 1.340" they need to be before fire forming?

I also measured .22 Hornet cases, 10 each from Highland (Privi), Winchester and Remington. On average the Highland cases were .001" thicker in the neck wall thickness than the thinnest (Remington).

I also measured all the rim thicknesses... will post detailed data later today when I get home.

[Tilleyman]

OK as promised here's the results of some measurement data I collected on Highland (PRIVI), Winchester and Remington 22 Hornet cases.

Neck wall thickness measured on a Mitutoyo digital ball micrometer, rims on a Mitutoyo digital vernier.

It can be seen that Highland has the thickest neck walls on average, followed by Winchester and Remington with the thinnest.

Despite having to produce ammunition to CIP instead of SAAMI specifications, Highland brass did not have the thickest rims as I had anticipated.

Thickest rim was Winchester, then Remington and Highland with the thinnest by a small margin.

Case diameter just in front of the rim was 0.2945" for unfired Hornady factory ammo, 0.2945" for unfired FLS reformed PRIVI brass, 0.2930" for once-fired FLS Remington Hornet brass and smallest diameter was 0.2925" for once-fired FLS Winchester Hornet brass.

So it would seem PRIVI brass will not be likely to have that slight 'pot-bellied' look when fired vs the smaller diameter Remington and Winchester brass.

Anyway, hope this is of interest to those forming 17 HH brass from 22 Hornet...

[vonrang]

The initial trim is 1.355

[Tilleyman]

Here's a table comparing neck wall thickness between the same brands... just to keep all the case forming info in one place.

Note that PRIVI has the thickest neck walls and should therefore form the most robust 17 Hornet cases... see Median data.



All cases measured (with a Mitutoyo digital ball anvil micrometer) as 22 Hornet donor cases, except Hornady 17 Hornet cases.
If anyone has a digital ball micrometer with a small diameter anvil capable of fitting into the Hornady cases please measure up 10 cases and I'll update the chart

[Kevinj]

If you had a choice of brass to use what would it be?