The idea for the 12ga FH, and the first gun built for it, was Rob Garnicks on the AR Forums. In the first picture, a heavy duty Borchardt falling block. He has gotten 1000 gr to 3000 fps in this, a high pressure action.
Then I and others joined in and set up a big variety of guns for the case. The case, a brass case 3.85" long, made from BMG brass expanded out with straight sides, to take 12ga .729" dia slugs and a 12ga size rim added on. Also we get turned brass cases from Rocky Mtn Cart of that length and shorter. Many guys used 3.5" cases, as standard reamers are available, and 12ga 3.5" guns are available, so that they could shoot 3.5" plastic also. Our 3.85" chamber and 3.5" will shoot any of the shorter cases. In our work we found ways to get over a third more velocity in shorter plastic and brass cases using slower powders than regular fast shotgun powders. We reloaded fast rifle powder, IMR 4759, IMR 4227, in larger amounts and got 600gr hard lead slugs over 1800 fps in 24" barrels, and were lab tested to be at or under magnum shotgun pressures that are used in factory 3.5" loads.
More pictures, the 2nd showing long brass 12ga FH case with regular 12ga case. Other 12ga FH guns are next,3rd Nef Ultra heavy barrel with length added, 4th Nef 8ga made by boring out heavy barrel 10ga, 5th FBW falling block,my 585HE belted case.The FBW has a 20ga 3.5" extra barrel also. .And we also worked with 8ga,4ga, in falling blocks, 20ga, 16ga in break actions, and my wildcat 585HE,700HE in various actions.
6th picture is our big cartridges from 2 bore on down, in order-2bore- 4ga- 8ga- 10ga- 12ga FH- 700HE--700H 3.25- 30-06.
7th picture is 4bore falling block we built on our design. Our 4bore is 1 inch bore.We also helped in getting the barrel threads larger in the new large MRC PH bolt action to fit our cases like the 700H 3.25" shown in 8th picture in MRC.
9th picture is an 8bore bolt gun we set up as our first 8ga test gun. Used an Enfield and modified it like the Mauser 12 gauges were done.
Last is Savage 210 that Bret in MN set up with heavy barrel and a recoil reducer put into the hollow stock. Shown with boot off so you can see the build. He has gotten saboted 500gr slugs over 3000 in this.We will post a bunch more info and we welcome your ideas and help. And we'll give all the help we can to folks ..Ed Hubel













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