7mm Sherman Short

TheJeanyus

Sergeant of the Hide
Full Member
Minuteman
Oct 5, 2021
346
352
Huntsville, AL
I wanted to "expand my horizons" a bit by playing with my first wildcat cartridge, and I landed on the 7mm Sherman Short. I've been hand loading for 30 years or so, but I've never messed with anything without published load data before.

I have some some fresh brass, Berger 180 Hybrids, and H1000 to start with. I want to shoot a milder fire-forming load through 50 cases to get started. Is 54 gr of H1000 with the 180 a reasonable place to start, or is that too low? The load data on the Sherman site shows a 180 ELDM with 60.1 gr of H1000 and a 180 VLD with 65 gr. I generally like starting 10% under and working my way up slowly, hence where I came up with 54 gr.

Anyone with experience with this cartridge mind sharing their starting load and work-up experiences? The only threads I could find on it were older and only discussed loads closer to max...and a lot was with the unobtainable RL26 to boot.
 
I use the berger 180 hybrid with 62gr H1000 and cci 200 primers. Gets 2765 fps in a 24" barrel. Got a little faster with R26 but it's harder to come by and the H1000 is so consistent so ill take that over the extra speed. What brass do you have? Is it new brass with the 40* shoulder already?
 
Yeah, it’s the new 40 degree stuff. Supposedly doesn’t require fire forming, but I was going to shoot a milder load for the first 50 rounds before I started serious load development anyway.
 
Short Action Customs still has mine fitting the barrel. Mine is a Tikka T3X action (originally a factory 270 WSM) with a 22” Proof carbon barrel.
This is my alternative option - to buy a 6.5 PRC Tikka and send it to a gunsmith for a replacing the barrel. It would also solve the OAL risk with longer heavier bullets (vs traditional short actions), right? Aren’t all Tikka actions technically long action length?

Also, what bottom metal and magazines are you running? Any AICS conversions out there?
 
I wanted to "expand my horizons" a bit by playing with my first wildcat cartridge, and I landed on the 7mm Sherman Short. I've been hand loading for 30 years or so, but I've never messed with anything without published load data before.

I have some some fresh brass, Berger 180 Hybrids, and H1000 to start with. I want to shoot a milder fire-forming load through 50 cases to get started. Is 54 gr of H1000 with the 180 a reasonable place to start, or is that too low? The load data on the Sherman site shows a 180 ELDM with 60.1 gr of H1000 and a 180 VLD with 65 gr. I generally like starting 10% under and working my way up slowly, hence where I came up with 54 gr.

Anyone with experience with this cartridge mind sharing their starting load and work-up experiences? The only threads I could find on it were older and only discussed loads closer to max...and a lot was with the unobtainable RL26 to boot.
Try 54gr of h1000 for one shot and see where the velocity is then work up until you get to the 2650fps range for a FF load in a 22”

I ran 180berger vld-h’s at 2900fps in a 24” with a stout load of rl26 in the 7SS I loaded for. I also fire formed brass first with h1000 but I didn’t write down what charge I used for some reason.
 
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This is my alternative option - to buy a 6.5 PRC Tikka and send it to a gunsmith for a replacing the barrel. It would also solve the OAL risk with longer heavier bullets (vs traditional short actions), right? Aren’t all Tikka actions technically long action length?

Also, what bottom metal and magazines are you running? Any AICS conversions out there?
KRG Bravo with MDT WSM/PRC mags is what I have sitting here waiting for the barreled action to show up.