this round is actualy a 270-264mag (nick named 270-elmo)

so far I have worked up loads with my 2 favorite powders


first I built the round to use Serria Hollow Point Game king in 140gr

with imr 4350 will start with 56grains work up to hopefuly some where around 62 to 63grains
data gives me a max load of 63 grains for my encore overall max will be 65 grains if i build a bolt.


with imr 3031 start with 44 grains and build up hopefuly some where around 47 to 48.5 grains
data gives me a max of 50grains

all comments welcome if you have computer program and would run these loads let me know what you come up with thanks

Is there a free program out there like QuickLoad? Doesn't have to be fancy; I'm just looking for something simple that will calculate a muzzle velocity, pressure and energy in a given cartridge. Thanks.

Since I start with .264 Magnum data when working up loads for 6.5mm WSM because the case capacity is essentially the same, it stands to reason that you could start with .270 WSM data when working on loads for your wildcat.

i could not find one but broom_jm offered to run some loads for me

Unc not sure who you were ansering nv or me but I started with 264 win also as I am only necking it up 13 thousands I also used the 7mm rem mag as that only has a neck size of 7thousands more than my round so I avaraged out the max load for the 7mm rem using 4 diff manuals then I averaged out the max loads for the 264win using the same manuals then split the diff called that my max load for my encore and then worked the numbers backwards for a starting point. now my hornady manual list max loads at least 3 grains higher than any other manual I have so using just that book I determined my max load but I would not run that load in my encore

*** NOTE: The following contains load recipes that are not from a reloading manual and should be approached with extreme caution. Neither I, nor Shooters Forum, assume any liability for the use of this data and do not assert that it is safe. ***

BBD,

Your numbers for IMR4350 and the 140 Sierra HPGK bullet appear to be spot on, although it only gets you to about 90% fill rate. With IMR3031, your loads are a bit too conservative. According to QL, and their data for the 270-338 wildcat (essentially the same thing), you could start your 3031 loads around 47 and go to ~52. The fill rate there is less than 80%, so I like this powder even less. (Note: These data are for a bullet seated .350" deep, for a cartridge OAL of 3.372".)

You're using a magnum cartridge but not moving up to slower burning, magnum powders. I would personally choose H4831SC, 7828SSC, or RL22. With any of these, QL predicts 69 grains will give you roughly 58,000psi, so if you want to stay down around 55,000psi (very prudent with the Encore action) I would suggest dropping this another grain or two. Call 68 grains your absolute max with any of the three powders listed in this paragraph, backing off 5% for your starting load, and you should be in good shape. These powders will give >90% fill rate and with a 24" barrel, close to 3100fps, for the 140gr HPGK.

Be safe and watch for pressure signs!

NVShooter: I'm not aware of any free program that does what QL does.

wow that is great info I expected to be a bit higher on presure considering the 264 is up in the 63,000 to 64,000 range from what I read

I forgot to mention my barrel is 27'' long

thanks alot broom

I was answering you, the OP. I would dare say that bullet diameter has a bigger impact on pressure and velocity than does case capacity. Averaging together data from cartridges with the same case and similar bullet diameters is not a completely unreasonable way to get in the ballpark. However, the .270 WSM has the same bullet diameter and essentially the same case capacity as your wildcat, so to me it seems like a safer starting point.

ok makes sence to me I will have to check some stats for the 270 wsw have to buy a new book all mine are a bit older just wondering about preasure though cause the barrel makers state the short mags are high preasure.

time for more research
thanks for info

The 270WSM runs at ~64,500psi, the 264WM and 270 Weatherby (not all that different from your 'cat) runs at ~62,000psi, while the 270-338 is rated for ~59,000psi (according to QL).

Since you're using an Encore, why push the envelope and risk stretching the frame? That extra 100fps isn't going to make enough difference to justify the hottest possible loads you can get. If you really want the most velocity possible, you're better off with a magnum bolt action.

I agree i had no plans of pushing the encore I was very happy to see your preasure readings from QL
I have to buy that program


(someday maybe build a bolt and push the round but not now )

dies are here barrel shipped today cant wait to get everything together

My new Barrel arrived today looks great can't wait to test it
worked up some loads sized some brass

We want to see targets-- with holes in them. And make them holes close together...

yea thats what I want to see to can't test for a while though alot depends on my bow season
I know with the encore you are suposed to be able to switch barrels back and forth and not loose your zero but i just got my 7mm-08 pistol barrel dialed in for the season and i don't want to find out the hard way. but if I get lucky early with bow i will have plenty of range time
to figure it all out plus my scope bases did not yet come in dang thing is on back order

i will take some pics of the completed rounds and post them soon

did you run any test fires with yours yet