Well I don't shoot a 25 Souper that is the proper name, but have a 25 Hunter which is an HBR cartridge mad from a 250 Savage or the 22-250.
100 gr Moly bullets 42.5gr H414 3190ft/sec. So far I killed 14 animals deer an Antelope with 15 shots. This is a fine little Wildcat. the rifle shoots in the low 3's. and high 2's
I have a Ruger#1 in 25-06 that shoot very well, after hunting season I will have it rechambered to a 25Hunter L, which uses a full length modified 243 case. Done with the same reamer but run in an extra .218". This will give the rifle a new life. The barrel will be set back about .600"
There is another great 25 cartridge by Duane Spooner Tappen ND called a 257 DGR made by necking down a 260Rem. More info on thes caliber can be found on my web site. Fred M.
