Does anyone know how to start a load development for a wildcat cartridge that has no load data yet. I have a 22-6mm with the 1 in 8 twist. (224 TTH). I know that I should be using 7828, Rel 25, Rel 22, WMR, etc with the 75g AMAX. How do you know what powder charge to start at. Is there some kind of formula etc. to use???? Any help would be greatly appreciated. I will be loading with 60g Partitions, 64 g Win PP and 75g AMAX. Thanks

fetchmax: here is a good article on the 224TTH, including some suggested loads:

http://www.ttha.com/224tth.htm

what kind of rifle do you have? Regards, Jim

fetchmax,

My 75 grain AMAX load is 47.5 grains RL22, WW brass, F210LR primer. Chrony's at 3500 fps from a 26" barrel and will usually shoot 1/2 to 5/8 MOA. That is a HOT load in my rifle. Look at the TTH site--that's where I got my starting loads.

Good Hunting,

I have a 22x6mm Improved which is probably pretty close to what you have. Mine is a 28" barrel with a 1 in 8" twist. I shoot 80 gr Sierras. Behind that bullet I use 52.5Grs. of RL 25 or 51.0 Grs. of RL 22. I get right at 3700 FPS. I only shoot lighter bullets to fireform the brass, but have never chronographed them.

Fetchmax I'm doing the same thing. I have a Ruger #1 with a Lilja 3 groove SS barrel chambered in 22-6mm. Mine is a 1 in 9 twist and it's targeting the 75 grn. A-max. The only load I've shot so far is 46 grns. of RL 22 and it seemed pretty hot. I don't have my chronograph set up yet (which I need to do).

Just shots some loads with this. 46.5, RL22,Fed215M, 3450fps near max. Tried the same load with Fed210M and was a little slower. Both shot real accurately. Shot in a 26" 1in 8" barrel.

Anyone checking the runout on your bullets after loading? Mine are terrible. In the .010-.015 range. I'm using Norma 7x57 brass which should be better than Win. or Rem. but maybe not. After I prepped the cases I had .002-.004 runout on the necks but they went south when I seated the bullet. I'm using Hornadys new dies and a few cases with bullets seated did go from .000 to .003-.004-.005 but 85% were in the high end. Anyone have any ideas? Thanks in advance!