Sherman 7 MAX
- Thread starter BCX
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I'm starting 7 Max load work-up, with ADG/Sherman brass, Berger 190 LRHT, Fed 215 and N570.
Can someone who has been there suggest a good starting powder weight for pressure ladder?
Maybe something in the vicinity of 60 or 62 gr?
Can someone who has been there suggest a good starting powder weight for pressure ladder?
Maybe something in the vicinity of 60 or 62 gr?
Yeah after dealing with the headaches of fire forming for my 30 SM I sold it off, I'm done with wildcats.
Simplicity is worth a whole lot more than 50 fps in this hobby
I dont use that powder but id say 65 grains is a low starting point. I started with 64 grains with imr 7977 which is way faster. But theres alot of guys who run that powder. Or ask sherman
You’re pretty much going to stuff as much N570 in as possible and call it good
It’s too slow for what’s probably 69-70 grains of water useable case volume.
R26 and N565 are the better choices.
When you get into the 100+ grains of water useable like my 338 edge N570 is awesome.
It’s too slow for what’s probably 69-70 grains of water useable case volume.
R26 and N565 are the better choices.
When you get into the 100+ grains of water useable like my 338 edge N570 is awesome.
Thanks, noted. I'm running a long action so not constrained by mag length. With 190 LRHT at the lands, COAL is appx. 1.150"; that should allow some flexibility for jump without bearing surface extending beneath the case neck.
Good idea, I called Sherman. For best velocity he recommended N570 over other powders I have available (H1000, MRP, 7828ssc), and said near 100% fill would get to or near 3000 fps. And he suggested a 67 gr. start load.
I might shoot some tomorrow.
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I’m not sure of your barrel length but I predict 2930 (28”) but fairly low pressures 61K at 67.
Start at 66-67 grains w n570. I ran N570 w Berger 190 up to 70 grains which is a compressed load. The 190 ran best for me w 68 gr N570 at 3.200 OAL. All shot from a 26 " Proof 1-8.
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Yes, I did see your posts at the start of this thread, and your powder, bullet, and barrel are (were) right in there with what I am working with -- very helpful, thanks.
I ran a 10 shot ladder from 66 to 70.5 in 0.5 increments. No pressure signs to speak of. At 68 gr. I got 2948 fps; at 70 gr. I got 3034 fps. Not gonna lie, I am not hating these results.
I'm going to have to get a powder drop LOL. At 70 gr. the powder is up in the neck. Tapping the case on the bench did cause some settling, but still, there is slight compression but no crunch when seating. COAL=3.140".
N570 is the king in that little cartridge, you can't get enough in there to run into pressure!
Shot from the bench, seated, 100 yds, 5 rounds each at { 67, 68, 69, 70 } grains of N570, with Magnetspeed attached; 68 gr. made the best group (appx 3/4") and least variance. I think the gun wants to shoot better, but the operator is the weak link.
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You guys using Rich’s headstamped ADG brass? Need to get some bushings and this batch of brass was a little loose in the next. I’m thinking .314, .313 and .312 neck bushings. What are you guys using?
How’s the 7828 work For you? I’m not interested in the N570. I do have 10lbs of H1k and 20+ lbs of 7828 so fingers crossed it works. Plan on runing 180gn Beger hybrids out of a 26” proof. I’d be happy with low to mid 2900’s
I didn't use 7828. I used imr 7977 and imr 8133. I didn't have much luck with that cal so moved on. But imr 7828 is good powder for speed not as temp stable. Should work fine in hunting situations
Yeah 10-4. I have the dies and brass but haven’t decided 100% on whether I wanna run the Max or just stick with Reg 7RM. Seems like a lot more powder options with the 7RM and powders that I currently have.
If you were to do it over again, what would be your choice?
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I would not do 7 max personally again. The speed was not there the brass was different everything needed different bushing as well. I had die issues not much help ended buying another set. But others had good results. Is this hunting rifle?
Goood to know. Yeah it’s gonna mainly be hunting rifle. Kind of a mixture of both. LR Elk / deer.
Kicked around a 28N but not into it for the same reason I’m not into using the N570. I like to shoot too much for sub-1k barrel life. Figured 7RM and just run 168’s would fit the bill if I decide against the 7Max
I have been using the Sherman/ADG 7 Max brass, and am still using 0.312" bushing and 21C T28 mandrel -- works so far with both 190 LRHT and 170 Cayuga, YMMV.
Nothing new to report since my post in the other (bullets) thread. Hunting out here was fucked by fires in the Sierras this Fall so no interesting terminal results. I have a batch loaded for testing at a mile (+/-), but also many distractions. New stock is inbound from Manners, so I expect shooting this thing will resume shortly
Awesome interested in results at 1 mile. Yeah hunting Is rough this year here. Dry hot and no snow makes it pretty hard. I'm glad I didn't draw no tags hahaNothing new to report since my post in the other (bullets) thread. Hunting out here was fucked by fires in the Sierras this Fall so no interesting terminal results. I have a batch loaded for testing at a mile (+/-), but also many distractions. New stock is inbound from Manners, so I expect shooting this thing will resume shortly
Is anyone annealing the ADG/Sherman 7mm Max brass with AMP annealer? If yes, what settings are you using? These cases are not in AMP online list of Cartridge & Brand. The ADG 7 SAUM case *is* listed, but not sure that can/should be used with 7 Max.
Rich said one of his other customers is supposedly sending the required (6) sample cases to AMP for analysis. If that is one of you studs, can you please post if and when you sent them in?
Rich said one of his other customers is supposedly sending the required (6) sample cases to AMP for analysis. If that is one of you studs, can you please post if and when you sent them in?
I believe Rich was referring to me but work has been crazy this year! I never got around to it>
I have the Aztec mode but Amp told me not to use the 7 SAUM code to Analyze. They wanted me to send cases in.
Was the Amp code generated from the preformed Gen 2 40 brass? I believe the necks are thinner than Shermans Gen 1 brass.
I finally dragged the 7 Max to the range w me over the weekend. I’m a little lean on scopes this year so had to pull one while at the range. Virgin 7 Max brass w 40 degree shoulder n570 Berger 195. First 3 shots prone @ 100… I’d say she’s still doing good 
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