Gary, Bob, and others
thx for the inquiry as here is the skinny on the 20 Beggs. All credit goes to Gene who came up with the design and modifications to the 220 Russian case. Dave Kiff @ PTG has reamers in stock, and Hornady and Gene have FL bushing dies in stock,$105 delivered TYD) . The 22 and 6mm Beggs have already proven successful in benchrest shooting matches.,plenty of info on the Beggs over on benchrestcentral.com)
For bullet seating, I use a Wilson 20ppc BS which I already had.
the 20 Beggs case has the same powder capacity as a 20 PPC -.100" short with no case prep needed. Just neck down a 220 Russian to 20 then load and shoot. the 20 Beggs has the same radius as a PPC case, is just as accurate as the fireformed PPC case, and has little to no case stretch. You can decide between a no-neck turn, or a light neck turn chamber. My necks are lightly turned just to clean up neck walls after reducing from 22 to 20 caliber. My chamber has a .231" neck as necks are turned to .0125". Loaded round mics .229"
There are approx. 4-5 20 Beggs floating around as my good friend Ken Ekstrand in San Antonio helped me with his load data I posted above. Ken went with a 1:10" twist Shilen 26" barrel in a LV contour.
I went with a 1:12" HART since I only plan to shoot the 40 Bergers and 39 Sierras. I did not need a faster twist barrel since I won't be shooting anything heavier than 40 grs. A 1:9" will also work as you can call any of the custom barrel makers to ask there opinions on your intended set up.
I have custom rifles with Stolle Panda, Kodiak, and Grizzly II actions as my 20 Beggs barrel can be swapped between any of my 3 stocked actions. I can do load development on the Panda action LV BR rifle, then thread the 20 Beggs onto my Kodiak or Grizzly II for varmint/predator eradication
IMHO - the best things about the Beggs case are.... Lapua brass, N133 powder, Berger bullets, very minimal case prep, and super accurate. The Lapua brass should last being fired over 40 times each !
feel free to ask me any other questions or PM if you need more assistance.