Hi I’m new to this sight , my first post . I’ve been following for some time though , and think I’ve found a new home the discussions are great lots of knowledge and respect for one another . Great sight thanks for allowing me to be part of this collective knowledge. Long time hunter, and have been reloading for 30+ years now . Over the years my interest has lead me to the large calibers 338/375/416/50 and last 6/7 years to long range target shooting . I love the proses of designing a wild cat , some are petty main stream ,300WSM/6.5 almost a std now. Improved 338 lapua necked down to 7MM, have one of tubs 338XC lots of power have done some rebuilds on std rifels , new barrels stocks , triggers ect just fun stuff . Always wanted to develop a new cartridge that actually filled a void . And the new long range big guns are a big attraction for me ! Shot the 50 BMG then 416 Barrett, saw all the great 375 options but ran out of money for another complete new gun , thought if I could just change out barrel to 375 that would be the way to go . But with a 50/426 action every thing in 375 was in my opinion way over bore! So we needed a wild cat designed for 375 caliber on a 50/416 size rim and base. (007-375) is my answer it’s a 2” cartridge appropriate body taper -30 degree shoulder with a long neck for heavy , , long for caliber bullets. holds 150 to160 gr powder depending which is used . And best of all just rent a reamer and get a 375 barrel and good to go !! a hole lot cheeper than a new gun . And best of all easy new brass just reload and go! Lots of info and pictures at mission shooting supplies