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.

 

[Saltybizketz]

I have put together data from the many shooters that emailed/PM'd me. Here is what I have so far but I am still asking for more data to be PM'd to me so I can continue to add to this.
Thanks to everyone who contributed to this.
As always this data is for specific rifles and should be worked up to find what is safe in your rifle.

How would I go about getting the data for 7ss.

 

[Saltybizketz]

I have a new 7mm ss barrel and 12 pounds of retumbo. Any starting points

 

[Phil Rizzo]

Sherman Wildcat Cartridge website
Load data

 

[haisardao]

Sherman Wildcat Cartridges

shermanwildcatcartridges.com

 

[Saltybizketz]

Sherman Wildcat Cartridges

shermanwildcatcartridges.com

Thanks a ton..

 

[elkaholic]

Thanks a ton..

Retumbo is on the slow end for the SS but will do ok with a CASE FULL with 180+

 

[kaseyfied]

Yeah I would do 565.. rl23...560 myself

 

[Saltybizketz]

Retumbo is on the slow end for the SS but will do ok with a CASE FULL with 180+

I'm definitely running burger 180. I kinda wanna keep it between 2600-2800. I wish I had other powders but retumbo is all I have in that variety. This is my first MAG. I'm a 6 gt, 6 dasher, 7mm 08 guy usually

 

[kaseyfied]

Barrel length?

 

[elkaholic]

I'm definitely running burger 180. I kinda wanna keep it between 2600-2800. I wish I had other powders but retumbo is all I have in that variety. This is my first MAG. I'm a 6 gt, 6 dasher, 7mm 08 guy usually

You should have no problem getting that speed. I reached over 3000 with a 180 Hy with a compressed load at 64 (I think} 26" barrel

 

[kaseyfied]

I saw 2800 with a 155 in a 22.. with n560.. h1000 was about the same 2820 at 63 grains