Back in the 1990's, I did. It was an idea of mine and Glenn Newick.
I called it the 25BR Whacker. It was simply a 6 BR necked up to 25 caliber. JGS ground the reamer, .274 neck and a .060 throat.
What made it work was Jeff Fowler's 85 grn FB match bullets, made on .925 J4 Jackets. I used Krieger 13 twist barrels, and N130.
I didn't do bad with it. I won a few yardages, the first "teen" Agg I ever shot was with it.
The big problem was Jeff would only make the bullets periodically. I was also shooting a 6PPC, so after a few years playing with it, I decided to just go 6PPC.
There are good bullets out there for it. Berger being one, and BIB is making some interesting long range bullets. A good friend of mine and myself just took a 1-8 twist 25 caliber barrel and made sort of a 25 Dasher. We ran the reamer in .070 long, and I made a rig up to form the cases. He used BIB 115 grn (I think), and the darned thing shot pretty darned good at 400 yards. Ed is getting a dedicated reamer ground now.
We were able to do this because my original Whacker reamer had a trim to length at 1.500. Since a 6BR case is 1.560, we had some metal to play with.
The longer ranges might be the future of the 25.With the 25 BR Dasher configuration, you can easily get 3000 FPS out of a 115 grn bullet with a BC in the range of 550. But in all honesty, I doubt it will do anything better than a 6Dasher with 108's.
When Jeff Fowler and a few others attempted to resurrect (hell, get it off the pad) the .25 Cal. around, or, about 1990-91, J4 offered four jacket lengths: .780"; .850"; .940", and 1.125". I believe that Jeff and his friendly rivals began with
75 gr. bullets - based upon the shortest offering - paired with 1:14" twist barrels. This made for a good partnership, because the finished FB bullets were about 0.80" long, with about a 10.3 specific gravity, thus exited the muzzle with more than adequate gyroscopic stability - about Sg 1.7 sea-level Std., @3000 FPS). All was rosy!
Then, the short jackets, "dried-up", whereupon, Jeff and others proceeded to craft their 75 Gr. bullets using the next longer (I believe .850") jacket, without regard/consideration of TWIST rate: this resulted in a weaker, but not catastrophic model: specific gravity dropped to about 9.1, begging for a 1:13" twist rate (sea-level, Std., @3000 FPS). Some [nominal] 14" twist barrels weren't quite up to the task, and precision began to erode.
Then, fast forward to the next jacket shortage, whereupon the jacket selection was reduced to the two longer offerings: .94" and 1.125" . . . keeping it short, FB bullets, of almost any practical weight, on the .940" jacket are marginally stable via 1:13" twist, and are much better at 1:12". BT bullets on this jacket will perform much better via 1:11" twist, which will also make FBs quite content. The 1.125" jackets shoot competitively via 1:10" barrels, but 1:9" makes for "hummers"!
Well, at least, the
HUMMER Bartlein, 1:9" twisted, conventional rifled 4-groove barrels have not been ruined by the "fast" twist!
For a nice (perfect) Sg 1.5, the 110 Gr. BT wants the 9" twist! 7 HoF points in consecutive NBRSA Hunter Nationals dispelled the myth of twist rates being, "too fast" - As evidenced by a pair of 200 Yd. wins, and a Grand Agg. "Just right" works quite well.
Note the groups delivered by Al's
Hart 1:10" twisted .250 Ackley Imp.!
But, I'm rambling - BR shooters, who should have known better, blamed the demise of the 25 on, "bad jackets": the REAL culprit was mismatched (inadequate) twist rates. Twenty-five Cals. are neither better, or, worse than any other caliber: for those who can think outside the box, across the caliber spectrum, there's still a LOT of money on the table.
Back to Jackie's (red above) model - it (1:13" twist) had a chance!
On second thought, staying with, "that'll never work", may be a better plan - thank for the reminder, James, . . . Keep 'em ON the X! RG