With the difficulty in getting 300 H + H cases from Remington or Winchester and the Nosler cases just a promise now. What case would you use to form 300 H + H brass? My thoughts include 7mm STW, 8mm Rem. Mag, 375 H + H and basic brass. I have never had to form cases but think it is easier to neck up than neck down ? Comments appreciated!

I actually like necking down rather than up because I get thicker necks in the finished cases.

Most chambers have excessively large necks and the thicker brass gives your cartridges a much better fit.

I'm fortunate to have stached away several cases for the H&H but if I was to reform, I'd use 300 Weatherby cases.....

I agree with Fjold however....the 8mm Rem mag would be another good choice.

My vote is for 300 Weatherby. Probably will be very easy to form if you go light on the lube so you dont trap any ahead of the Weatherby shoulder and dent the case. Be sure the vent hole in your sizer die is clear so you can get rid of that ugly Weatherby shoulder.....

I use 375 H&H, and it works very well. My first 100 pieces were from new 375 "basic" brass and I lost a few because I did not anneal them first. They also came out 2-3 mm shorter.

I then fireformed with a cast lead bullet, resized and neckturned.

Using 300 Weatherby is a good call but the expense!!!

Pete,
375 brass is hard for some folks to find now. Winchester discontinued regular production of it.

thanks for the insight gentlemen. I have 160 cases unfired and 100 rounds of loaded ammo, however, one never knows if and when it will be available again.

I think it would be easiest to use .375 H&H brass-it already has the right taper.......

My preference for forming .300 H&H is 8mm Rem Mag. Cheaper than Wby brass and you don't get the neck thickness that you get when sizing down .375 brass.

I have used .300 Wby without any problems. When I first started experimenting, because of the lack of taper on the Wby case it was tough to size them down and regain the gentle slope of the H&H. I tried a bunch of different lubes and found the water-based Lee case lube to work the best. Put a good coating of the Lee lube on and it will size back to a .300 H&H easily. Any other lubes forget it. I thought I was going to tear my press off the bench trying to form them using the others.

Also, on sizing down, I have done .30-06 to .270, .308 to .243, .375 to .300, etc. You have to watch the neck thickness because too thick and pressures will spike. I prefer to ream after sizing down for that reason or to neck up if possible.