7 sherman MAX

357Max

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I know, but since Max is also a LA I'm very curious to see what kind of performance the 7mm Max will deliver. It may make me change my mind.
 

BCX

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My smith is chambering my barrel as we speak for the 7 Max. I bought the reamer and adding some FB for the Berger 195 at OAL 3.200 on a LA. I will post probably in a few month. Should be a good combo!
 

BCX

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Bjay hows the load developing going?
 

khuber84

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I've done some pressure testing vo spreads on 180hyb, 195 eol, and 151 pva Cayuga in my 7max. Rifles only 8# 2oz scoped so pretty light.
LPA Razor Ti long action
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Hawkins bdl setup w/ 3.7" cfe box
Hawkins 30mm hybrids
March 3-24x42
 

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BCX

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Room to go hotter w the Berger 195? What OAL are you running?
 

Steel head

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I've done some pressure testing vo spreads on 180hyb, 195 eol, and 151 pva Cayuga in my 7max. Rifles only 8# 2oz scoped so pretty light.
LPA Razor Ti long action
Huber 2 stage
Ag Composites visigoth
Hawkins bdl setup w/ 3.7" cfe box
Hawkins 30mm hybrids
March 3-24x42
Barrel length?
 

khuber84

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Room to go hotter w the Berger 195? What OAL are you running?
There may be room, I didn't load much hotter as there isn't much more room for powder and I'm running a 15" drop tube. Oal is around 3.15"
 
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khuber84

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My bartlein blank should be here any day. I have 100 rounds loaded to fire form with 162 AMAXs. Hoping to run the 195s. 26” med palma blank. Got N570 ready to go.
180s @ 3075 don't give up anything to a 195 @ 2950 do they? I tried N570 w/ 180 vlds, which have more bearing than hybrids, and 72gr went 3160 but primer almost fell out. I suspect I was north of 70k psi. These Shermans had pressure like nobody's businesses.
 
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BCX

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Im hoping to hit the 3k fps mark w the 190 A-tip and good accuracy. To the guys loading the A-tips, how are they seating without a modified seating stem?
 

khuber84

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Im hoping to hit the 3k fps mark w the 190 A-tip and good accuracy. To the guys loading the A-tips, how are they seating without a modified seating stem?
I've seated 230, 135 and 153 without using the alternative seating stem, no issue. I could see deformations if you are using excessive neck tension.
 

BCX

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I have the Whidden dies for the 7 Max so i should be good.
 

Keyboardcommando

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I've done some pressure testing vo spreads on 180hyb, 195 eol, and 151 pva Cayuga in my 7max. Rifles only 8# 2oz scoped so pretty light.
LPA Razor Ti long action
Huber 2 stage
Ag Composites visigoth
Hawkins bdl setup w/ 3.7" cfe box
Hawkins 30mm hybrids
March 3-24x42
How well does it feed in the bdl I’m looking at building one in a defiance long action with a bdl set up for hunting.
 
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khuber84

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How well does it feed in the bdl I’m looking at building one in a defiance long action with a bdl set up for hunting.
Feeds like crap to be honest. The cfe box helped. So far I'm not seeing the performance Rich said the case would get. Truthfully I'm not a fan of operating at 75-85k psi to achieve the advertised velocity. Building a 7-300prc to get 195s to 3000 and 180s to 3100 safely at low pressure. There's efficiency, then there's stupidity.
 

bwahl

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Feeds like crap to be honest. The cfe box helped. So far I'm not seeing the performance Rich said the case would get. Truthfully I'm not a fan of operating at 75-85k psi to achieve the advertised velocity. Building a 7-300prc to get 195s to 3000 and 180s to 3100 safely at low pressure. There's efficiency, then there's stupidity.
I would agree, some of his numbers are a absolute best case scenarios. But overall, I'm fairly happy with what I'm getting out of my 7 max with a 22" barrel. I'm equaling or surpassing velocity in my 7 Rem mag with a 3.5" shorter barrel and less recoil...burning a touch less powder.

I'm still fine tuning but it looks like my final load will be somewhere in the 3225-3270 fps range running 69ish gr of RL 26. I'm basically .5-.75gr from a shiny ejector stamp and an extracter mark from a tikka bolt.

I hope to see someone get some pressure numbers for this caliber so we can see what's really going. No doubt they're running higher than your standard calibers...but is it dangerous? My brass doesn't seem to think so... At least not yet.
 

Steel head

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I would agree, some of his numbers are a absolute best case scenarios
This is one of the reasons I didn’t go the Sherman route, after some research and seeOmg real world numbers it just wasn’t worth it to me.

I’d definitely go that route before a 7mm RM though.
 
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bwahl

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This is one of the reasons I didn’t go the Sherman route, after some research and seeOmg real world numbers it just wasn’t worth it to me.
Really depends on how you look at it I guess. I was set on a 7 saum, but when I looked at what it cost to get good brass and dies it really wasn't that much difference if you're going to build. I read about guys getting similar performance out of factory 7 saums in model 7s but they seem like the few minority. The whole point of this build for me was to build a compact 7mm to hunt suppressed and still equal or pass my 7mm mag in performance. That mission has been accomplished. If I could do it over again I'd probably go with another inch on the pipe just to help out a bit with velocity.

I'm no expert by any means, but I feel like a 7mm 145 gr solid @ 3250 fps out of a 22" tube is impressive.
 

Toddlouis27

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Following. I’m having a barreled action built by straight jacket armory, hoping to get it at the end of June.
 

BCX

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Any updates on performance?
 

khuber84

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That’s not good!
Barrel length?
26" proof. But honestly, how can you ask a case with 78gr capacity to hang with a case with 25gr more like the 28N? If a guy could get 2900 and accuracy, be happy, as that's where top of normal pressure curves are. My load at 3000fps was likely pushing 80k psi.
 

Steel head

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26" proof. But honestly, how can you ask a case with 78gr capacity to hang with a case with 25gr more like the 28N? If a guy could get 2900 and accuracy, be happy, as that's where top of normal pressure curves are. My load at 3000fps was likely pushing 80k psi.
Well reading what Sherman says near 3000 is the goal with 195’s.

maybe 2950 is near 3000.

I can get 2850 with 195’s with my 7 saum with a 28” barrel without destroying brass.

The extra powder in 7 max isn’t accomplishing a lot at 2900 but I agree that at that speed it would probably be a fantastically stable load with excellent performance
 
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khuber84

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Well reading what Sherman says near 3000 is the goal with 195’s.

maybe 2950 is near 3000.

I can get 2850 with 195’s with my 7 saum with a 28” barrel without destroying brass.

The extra powder in 7 max isn’t accomplishing a lot at 2900 but I agree that at that speed it would probably be a fantastically stable load with excellent performance
Exactly.......if you want to run 3000fps with a 195 comfortably in pressure range, a case in the 90gr area is needed. That's why I'm building a 7-300prc, will either sell 7 max or rebarrel. I will say the max case is better in 6.5mm bore. And the SS/SST cases are better in the smaller bores as well, because that puts them into an overbore capacity, to get the performance. In no world should a 7SS with 72gr capacity be running same speeds as a 7mag with 13gr more power.
 

BCX

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If i cant get the velocity 190/195 w good accuracy than 180 class should get there. Im my research guys like the Berger 180s better for hunting.

Reason i built on a LA, easy cartridge change to a barrel burnin 28 Nosler LOL!
 

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Mark just called. Rifle is finished. Time to load up to start fire forming next weekend.
 

Fubarredz

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I had Garret Preece in Utah just build me a 7mm max and if I knew it would feed like crap I might not have gone with it in the BDL. I’m hoping to shoot the 180gr VLDH’s built it to wack pigs at 800yards at the ranch in south Texas. Rich told me they were having great results and speed with the Berger 175eol’s and the 180vldh’s with RL-23. So I think that’s what I’m gonna start with.
Wonder if I can modify the BDL box and follower to help with feeding issues?
 

BCX

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HS Precision DBM should be a direct replacement for BDL style bottom metal. My 7 max feeds no problem.
 
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khuber84

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I had Garret Preece in Utah just build me a 7mm max and if I knew it would feed like crap I might not have gone with it in the BDL. I’m hoping to shoot the 180gr VLDH’s built it to wack pigs at 800yards at the ranch in south Texas. Rich told me they were having great results and speed with the Berger 175eol’s and the 180vldh’s with RL-23. So I think that’s what I’m gonna start with.
Wonder if I can modify the BDL box and follower to help with feeding issues?
I installed a wyatt's cfe13 mag box for center feed instead of off the lips. It's a heck of a lot better than it was with a mbe mag box. I do like the idea of the hs precision dbm, however it adds weight. I was trying to keep mine as light as possible. Its 6.7# minus optics.
 

BCX

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I installed a wyatt's cfe13 mag box for center feed instead of off the lips. It's a heck of a lot better than it was with a mbe mag box. I do like the idea of the hs precision dbm, however it adds weight. I was trying to keep mine as light as possible. Its 6.7# minus optics.
Not sure on the weight difference but i would guess .5 lb w the mag.