Sherman Wildcat Reloading Data is Here!!!

[lancetkenyon]

Not that this will ever be an everyday occurence....but....when the stars align, and I do "my part"....

Top end, very slight 2 finger bolt lift.

6.5SS
26" 1:7.5" Proof Sendero Light w. 69 rounds down it
ADG 6.5SS brass (fully formed)
Fed GM215M
57.0gr RL23
156 Berger Elite
3078fps
ES 8
SD 4.6

 

[Buster Hemlock]

Should have my new 25SST next week.....I have rounds loaded up for a ladder in anticipation...

Lance, keep us posted when you get it up and running. Also let us know what the rifle specs are, I may have missed it earlier.

 

[lancetkenyon]

Lance, keep us posted when you get it up and running. Also let us know what the rifle specs are, I may have missed it earlier.

Kelbly Atlas Tac SA w. Pinned recoil.lug and 20MOA Picatinny rail
Tac Ops carbon fiber knob
26" 1:7.5" Proof Sendero w. 3 port Muscle brake
Manners EH1 w. Gen 1 mini chassis using Accurate .300WSM mags
Trigger Tech Diamond
ARC M10 36mm "Low" (24mm high) rings
ZCO 4-20×50 w. MPCT1

Planning on running the 131 Blackjack Ace (shown in previous photo) and 121 Hammer Hunters out of it.

ADG "25 SST" headstamped brass
Fed GM215M
RL23
131 Blackjack Ace

 

[Winny94]

2 questions concerning the 7 SS:
1) what is the min/max case length?
2) Anyone who runs a 180 class bullet w/ H1000 & ADG brass: can you tell me what you found your max charge to be? Ive only been able to find 2 individuals who shoot this combo - one runs at 60.5, the other at 62gr. I just need to find out how high to run my ladder. I dont want to go under as I can only get to the range 1x/week, but I dont want to go too high as every case that gets a bullet pulled gets relegated to the "fouler" pile as neck tension isnt the same on the 2nd seating.

 

[rockwallraider]

have 2 different 25sst up and running
both have a bto of 2.141
131 BJ
210m
61.3 and 61.8 grains of n565
3250 and 3265
26 inch bartlein barrels with tikka actions
one has krg stock and other has McMillian game hunter

 

[rockwallraider]

Not that this will ever be an everyday occurence....but....when the stars align, and I do "my part"....

Top end, very slight 2 finger bolt lift.

6.5SS
26" 1:7.5" Proof Sendero Light w. 69 rounds down it
ADG 6.5SS brass (fully formed)
Fed GM215M
57.0gr RL23
156 Berger Elite
3078fps
ES 8
SD 4.6

my 7.5 twist is running 61.7 grains of n565 at 3040 with an es of 3 and sd of 1 when the stars align.

 

[WiscGunner]

2 questions concerning the 7 SS:
1) what is the min/max case length?
2) Anyone who runs a 180 class bullet w/ H1000 & ADG brass: can you tell me what you found your max charge to be? Ive only been able to find 2 individuals who shoot this combo - one runs at 60.5, the other at 62gr. I just need to find out how high to run my ladder. I dont want to go under as I can only get to the range 1x/week, but I dont want to go too high as every case that gets a bullet pulled gets relegated to the "fouler" pile as neck tension isnt the same on the 2nd seating.

For me, I loaded to 62.8gr without any heavy bolt lift but with the COAL in my short action chamber, I could hear powder crunching at 61.6gr H1000 with a 180gr ELD-m. Slighted amount of freedom to shake powder at 61.4gr. I had a node below compressed at 60/60.2 so I picked 60.1grs. This load has settled in at 2843fps suppressed but remains very stable.

Max BTO in chamber: 2.2290
Max COAL: 2.9625
Loaded BTO (less .02"): 2.2085-2.2095
Loaded COAL: 2.945
ARC Mag Max COAL:2.96
ADG Brass uniformed at 1.945"
Federal GM210M
Proof CF 1:8 26"

 

[Winny94]

For me, I loaded to 62.8gr without any heavy bolt lift but with the COAL in my short action chamber, I could hear powder crunching at 61.6gr H1000 with a 180gr ELD-m. Slighted amount of freedom to shake powder at 61.4gr. I had a node below compressed at 60/60.2 so I picked 60.1grs. This load has settled in at 2843fps suppressed but remains very stable.
View attachment 149610
Max BTO in chamber: 2.2290
Max COAL: 2.9625
Loaded BTO (less .02"): 2.2085-2.2095
Loaded COAL: 2.945
ARC Mag Max COAL:2.96
ADG Brass uniformed at 1.945"
Federal GM210M
Proof CF 1:8 26"
View attachment 149611

Wow, all fantastic info, thanks a lot! You have a nearly identical setup to me. LRI did my chamberings, so I have a short throat, so I have no issue with COAL, but I did the Berger VLD seating test and they liked .090" jump. So that bullet is stuffed pretty good.

I plan to develops long range steel load with 195s but they may need single fed - this load is for a mulie/pronghorn hunt in 2 weeks

 

[Winny94]

For me, I loaded to 62.8gr without any heavy bolt lift but with the COAL in my short action chamber, I could hear powder crunching at 61.6gr H1000 with a 180gr ELD-m. Slighted amount of freedom to shake powder at 61.4gr. I had a node below compressed at 60/60.2 so I picked 60.1grs. This load has settled in at 2843fps suppressed but remains very stable.
View attachment 149610
Max BTO in chamber: 2.2290
Max COAL: 2.9625
Loaded BTO (less .02"): 2.2085-2.2095
Loaded COAL: 2.945
ARC Mag Max COAL:2.96
ADG Brass uniformed at 1.945"
Federal GM210M
Proof CF 1:8 26"
View attachment 149611

So per Berger's advice, I found the rough seating depth first (which ended up being .090" jump). Since I have a short freebore chamber, the .090" ended up at a COAL of ~2.805. As you can imagine, that put the bullet in the powder column more than I would prefer. I ran tests from 58-62.4gr. I started compressing loads at 61.2, so moved to using a drop tube. These were some of the most consistent loads ive ever tested and it was crazy accurate as well (of the 12 different loads, 10 had an ES of 17 or less, and 6 had an ES in the single digits.) But the issue is they are incredibly slow - my 62.4gr load had an ES of 8, but is only moving at 2835 fps.
My question is; could the long jump be leading to lower pressure i.e. lower velocity? Or is my chrono lying to me? Slow barrel?

I have a hunt next week, so this will be the load I run with for this hunt, but I do plan to rework it later this fall if I can. I may need to try a new bullet thats less jump sensitive (175gr berger). Just looking for some opinions on why its so slow.

Specs:
ADG Headstamped Brass
180gr Berger VLD Hunting
Federal 210M
H1000
.090" Jump (2.0425 CBTO / ~2.805" COAL)

 

[tdot]

Jumping the bullets definitely leads to less pressure then touching the lands. I'm curious myself as to whether the pressure continues to drop as the jump increases. My guess is that it does.

I'd run a new ladder test, at the new seating depth to confirm.

I have a similar situation in another cartridge and I'm hoping I can gain some speed back by increasing the charge weight. But I have a bit of room in the case currently, so that should help.

 

[wvelk huntr]

What load data are you guys using for fireforming brass. I would like to do the CoW method with a false shoulder, but would also entertain using a loaded round. This would be for a 6.5 Sherman LA.

 

[Milepost]

Not that this will ever be an everyday occurence....but....when the stars align, and I do "my part"....

Top end, very slight 2 finger bolt lift.

6.5SS
26" 1:7.5" Proof Sendero Light w. 69 rounds down it
ADG 6.5SS brass (fully formed)
Fed GM215M
57.0gr RL23
156 Berger Elite
3078fps
ES 8
SD 4.6

Will this combo still work in a short Accurate Mag DBM 2.96" box? What freebore are you running/OTL for this combo?
I believe Rich has a few different freebore options for his 6.5ss and 6.5sst. This info will help me chose which one will work best in my SA DBM box.... Thanks

 

[lancetkenyon]

They fit in an Accurate mag @ 2.960".

 

[codyadams]

Here is a couple photos for the .270 Sherman page, 128 Badlands did the trick on this Idaho bull