H322 for 7mm and 7.65mm Mauser

[Ray1946]

I have more than a few pounds of H322 and would like to work up a load for both of these calibers with alloy gas check bullets. I am planning using the RCBS 168 gr. for the 7mm and the Lyman 314299(size .313) for the 7.65mm. I have a beautiful 1912 Chilean and a "matching" 1909 Peruvian that have been in the safe for far too long! Any advice for either of these wonderful cartridges with H322 is greatly appreciated!.............................

[runfiverun]

up to 28grs with a filler.
you must have the filler otherwise you'll get huge velocity variations which will show up as vertical stringing on the target.
do a search for the 7.65 argie here you'll see Larry Gibson has a lot of info on it and I'm usually on the thread somewhere.
if you can find the thread Runfiveslittlegirl started about 6 years back it has data and velocity's from a report she wrote up on using H-322 [with and without a filler] in 3 different Argie rifles.
or you could just use 18grs of 2400 like I do now.
airc she has moved on to 4895 and a filler to duplicate my 308 load.

[Texas by God]

It doesn't get more genuine Mauser than a 1909 Peruvian! Best, Thomas.

[Ray1946]

Thanks so much for the input. I got the Peruvian a little over 2 years ago and the 1912 about 3 months ago. That Peruvian set me back a little more than I had planned, but I am tickled to have gotten it. That big Lange rear sight and the polished receiver just make you glad all over. I sure hope I can make it shoot as good as it looks.

I have developed an interest in the Vintage Military Rifle matches and would like to shoot them in these matches. The Peruvian is my favorite, but I have never shot cast in 7mm caliber and am looking forward to developing some loads for that caliber in the Steyr....................

[runfiverun]

I.M.E.
the 7 loads seem to do their best at about 75% of the 30 caliber loads.
if 28.5-29grs of 4895 with a 1 gr tuft of Dacron does well in the 30's with a 150-180 gr boolit.
then @24 grs in the 7mm with a 145-170 will do well.

[HABCAN]

FYI, my 7x57 standbys for casts in my Brazilian '98 (LEE 130, Boolits' Soupcan 140, Lyman 160, RCBS 168) are 18.0 IMR4227 or 24.0/26.8 grs. IMR4198, CCI 200, no fillers, but you asked about H322.......never used that so can't help you there, sorry.

[Ray1946]

I was using RL7 and 4759 back in the 80's in my Schmidt-Rubin. I was using RL7(23.5-26.0grs.) with a gr. of Dacron under the bullets; 180gr.Lee and 193gr.NEI 195308. For some reason, in all of my testing,a load of 19.0 grs. of 4759 under any of the slugs I was using shot a very tight group. I was using a Remington 9 1/2 primers. I wasted a lot of good bullets testing different primers. The primers I tried were Remington(the best), Winchester, CCI and Federal. The CCI were close to the Remington, but the Remington was the clear winner.

The 7mm especially has a wonderfully LONG neck and would be perfect for partial sizing, I also found a unique old Lyman mold(287377) that really looks like it would be a flying son of a gun if I could get it moving up to around 1800-1900 fps. Winter is a great time for pipe dreams!??????????..............

[GONRA]

"Filler Users" assume they're
"just blowing the fluffy wad out the chamber behind the boolit".
True for olde fashioned Straight Taper / No Taper cartridges - no sweat.

GONRA reminds ya'll that using FILLERS in NECKED CARTRIDGES is "playing with fire".

One is tempted to "add more, since a little verks So Nice".
Eventually (takes VERY LITTLE additional "filler")
the "filler wad" compresses to its ULTIMATE DENSITY (solid, no longer "fluffy")
in the cartridge case shoulder whilst entering the neck.

Then, getting the "solid wad" THRU the neck requires EXTRUSION PRESSURES
that are FAR HIGHER than any CHAMBER PRESSURE
gun crazies are used to dealing with.

KABOOM!!!!!

[Ray1946]

Thanks so much for your advice. I honestly think there is nothing wrong with fillers. Using a filler in a bottle-neck case as I learned involves pushing a small tuft of dacron into the case neck so it rests in the lower part of the neck. When the bullet is seated the dacron is pushed by the base of the bullet into the case and rests just below the BASE OF THE NECK AND NO FURTHER. A little experimentation with the size of the tuft and getting to pull an even one grain I was able to achieve after a very short period of time. Using this method I was able to develop some very unique loads.

There is a vast difference in PRESSURE when seating a filler on top of the powder and just below the bullet. The greatest answer to most reloading problems is very simply; COMMON SENSE.................

[leadman]

I have been using poly-fil in bottlenecked cases for over 30 years without incident. From what I read it seems not using the filler to develop the loads and when the shooter is not happy with the results, adds a filler without backing the powder charge down and working up again is a cause for a kaboom or split case. I do not use a filler with fast "shotgun" powders or 2400, SR4759, or 296/110. Usually only 4895 and slower powders.

[Ray1946]

I agree with you completely! I also think something of great importance, but often overlooked is the habit of positioning the powder the same for every shot. Very simply, if the first round and all succeeding rounds are to be stripped from the magazine by brisk closure of the bolt, then by all means test your loads in this manner as this will be the position of the powder for all rounds fired. I learned this shooting high-power years ago with reduced cast BOOLIT loads.....................