Need info on 22-243 Win.

[pdhunter]

I am looking for load data for the 22-243 win.
I have found alot for the Middlestead , ai , ect. but not much for the Win. version.
Thanks for any help.
By the way I came across this site by accident. Sure glad I did

[runfiverun]

from what i gather from checking a couple of sources the middlestead is the same thing.
only it has the shoulder angle changed and probably the case has a little less taper also.
sounds like an ackley case ,but with 30* instead of a 40* shoulder.
if so the middlestead will have a whopping 5% increase in capacity at most.
the sharper shoulder is done to extend case life and reduce trimming.
i would reduce the middlestead loads by 5% and start there.
something like 42-43 grs of 4831 or rl-22 to start with.

[versifier]

Welcome to the Guide.

I agree. Middlestead data should be a safe starting point for your wildcat.

There was another very similar one, I can't recall the name of it. Seems to me Bullshop Jr's Dad had one if I remember rightly. Perhaps he will see this and comment on it for you.

Here's the usual precautions for sailing off the map:
Being aware of pressure signs if they appear and checking for them anyway if they don't is the safe route with any wildcat or any powder you don't have specific data for. Chronos can be a big help, but they don't tell you what is happening in your chamber, and primers signs are just not reliable enough to be sure either.

Unless you have access to a ballistics lab, the only ways you have to be sure where the line is between a MAX and an overpressure load in a wildcat are:
A. ...to go up until the primer pockets loosen and back the load off a grain or two (not the smartest way to go but a place we do all get to accidentally sometimes), or...
B. ...to mic a new case's head before and after firing. ANY increase in the solid case head's diameter is the sure sign of overpressure - nothing else will cause it - you can shoot safe loads in a case until you have to trim it a sixth time and its head diameter will not change. A caliper is not accurate enough to measure this, and you also need to mark the case so you measure it at the exact same point both times.

[pdhunter]

Thank you for all the good info. I now have a starting point