Sherman Wildcat Reloading Data is Here!!!

[RIZEN 1]

Thank you Phil!

 

[Phil Rizzo]

I've got a factory verified tight barrel.
Tighter than minimum spec…I figure it costs me 100fps, maybe more. but I still get acceptable velo and exceptional accuracy. Efficient cartridge design is valuable in a lot of ways.

 

[nksmfamjp]

Well, I'm always in development! This load is pretty close to done.

28 Sherman Magnum: ADG Brass; IMR7828SSC 75.0gr; Hammer Hunter 169gr @ 3.626" OAL; 3257fps with SD of 13.8 (n=24)

This load shot 5 groups of 5 into a composite 25 shot 0.75" group. Worst group was 0.708". Tuner not tuned yet!

Just wanted to share in case you are looking for a 28SM load. I'm sure many folks are chuckling about me posting an Sd of 13.8, but remember that is for 25 shots….not 3 or 5. Same with the group size. There are a lot of 3 shot 0.1" groups in a 0.75" 25 shot composite!

Well, this load blew up in 62 F weather. Velocity went to 3300. Pressure jumped up enough to have excessive bolt lift and extractor smear. I think it is gonna need to lose 1.0 gr to be good over 70F.