Which 7mm for a short barrel long range suppressed rifle?

JTH

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Which 7mm magnum cartridge would you select for a custom build, barrel length of 22”, threaded and suppressed. The shorter barrel is to bring better balance to the overall package while hiking and hunting. Primary purpose will be long range
deer(500-1,000), possibly antelope. I’ve been reading a ton, looking at 7mm-300wsm, 7mm wsm, 7mm saum, 7 Sherman Short and also considering 7mm Rem mag. Really not interested in the barrel burners (28 Nosler or 7 RUM). Many of the short wildcats posted here seem to be setup on long actions to feed the larger projectiles, if that’s necessary why not just go 7mm Rem mag and have far more options in brass and dies? In a short barrel setup, which of these will provide the highest velocity? Are there others I should be considering?
 

elkaholic

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Which 7mm magnum cartridge would you select for a custom build, barrel length of 22”, threaded and suppressed. The shorter barrel is to bring better balance to the overall package while hiking and hunting. Primary purpose will be long range
deer(500-1,000), possibly antelope. I’ve been reading a ton, looking at 7mm-300wsm, 7mm wsm, 7mm saum, 7 Sherman Short and also considering 7mm Rem mag. Really not interested in the barrel burners (28 Nosler or 7 RUM). Many of the short wildcats posted here seem to be setup on long actions to feed the larger projectiles, if that’s necessary why not just go 7mm Rem mag and have far more options in brass and dies? In a short barrel setup, which of these will provide the highest velocity? Are there others I should be considering?
If you're building a short action, you can not beat the 7SS! It will run a 180 2900' -2950 with a 22" barrel at 2.9" coal
 

HuntnPack

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Go with a Sherman Cartridge
Short action consider 7SS
Medium action go 7MAX.
ADG headstamped fully formed brass,
Dies, & reamers available.
Several builders chambering these, &
Some prefits available as well.
custom ammo available soon.

For a 22” suppressed custom build,
I’d opt for the MAX over a WSM or RM
 
Last edited:

Send it 284

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Which 7mm magnum cartridge would you select for a custom build, barrel length of 22”, threaded and suppressed. The shorter barrel is to bring better balance to the overall package while hiking and hunting. Primary purpose will be long range
deer(500-1,000), possibly antelope. I’ve been reading a ton, looking at 7mm-300wsm, 7mm wsm, 7mm saum, 7 Sherman Short and also considering 7mm Rem mag. Really not interested in the barrel burners (28 Nosler or 7 RUM). Many of the short wildcats posted here seem to be setup on long actions to feed the larger projectiles, if that’s necessary why not just go 7mm Rem mag and have far more options in brass and dies? In a short barrel setup, which of these will provide the highest velocity? Are there others I should be considering?
I'm getting 3000 fps with 175s from a 22" 7 wsm built on a LA.
Same capacity as a 7 RM but a better case design, I'd go with one of those two custom throated.
No need to mess with a wildcat, you'll beat them no problem with a wsm or RM
 

CBH Australia

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I hired a suppressed 7mmRm in South Africa, a Sako 85 Standard barrel I think. It did not seem to be a burden in length.

We don’t run suppressors in Australia, We cannot buy them for general use or hunting they are restricted.

It seems that they are allowed in New Zealand and South Africa with no real restrictions.

I see many are using these with high velocity ammo so the Silencer thing is not quite like on the movies.

I would consider the 7mmRm for convenience. I just built a .280ai and it’s my most obscure or least common chambering I own.

I’m not even running a Brake on that or a .300wm Tikka so I’m not sure what you need a suppressor for but protecting your hearing is a start.

They say the .280ai is nearing 7mmRm performance. Mine is a .26” barrel so I hope I am squeezing all I can from it.
 

lancetkenyon

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Funny to see this topic.
I just got a screaming deal on a NIB 24" 1:8.4" .284 5R Proof Sendero blank. I am hoping to have a 23" (as short as I can get it) finished length, to run suppressed as well.
I am wanting to run the 184 F Open Hyb or 183 SMK at 2900-2950. Want a SA mag build to reach that goal, mag fed.
7SS is what I am going with.
I have/have shot*: 6SST*, 25SST, 6.5SST*, 6.5SS, and 7SS*.

I also have a TriggerTech Diamond in my safe. Need to figure out an action, maybe a Defiance AnTi X if I can find one. Then order a Manners stock. Probably an EH1 w. Ultralight cheek piece.
 

GREATSCOTT!

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7SS if using a true short action and desire to mag feed, or perhaps a SAUM if you can use a medium action and load long in BDL-style metal.
 

Gone Ballistic

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I hired a suppressed 7mmRm in South Africa, a Sako 85 Standard barrel I think. It did not seem to be a burden in length.

We don’t run suppressors in Australia, We cannot buy them for general use or hunting they are restricted.

It seems that they are allowed in New Zealand and South Africa with no real restrictions.

I see many are using these with high velocity ammo so the Silencer thing is not quite like on the movies.

I would consider the 7mmRm for convenience. I just built a .280ai and it’s my most obscure or least common chambering I own.

I’m not even running a Brake on that or a .300wm Tikka so I’m not sure what you need a suppressor for but protecting your hearing is a start.

They say the .280ai is nearing 7mmRm performance. Mine is a .26” barrel so I hope I am squeezing all I can from it.
Two things you wrote I will refer to. (1.) Silencer is a totally fictional object that was the creation of some Hollywood movie director but do little to mute the sound of a bullet being discharged from a firearm. Suppressors do a similar job to lower the sound of a discharged bullet being fired, however, they only diminish the sound to a level that, sometimes, can keep one from damaging their ears, but usually don't reduce it below 130 decibels. (2.) 7mmRemMag ammo is a lot easier to find.
 

GREATSCOTT!

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Silencer is a totally fictional object that was the creation of some Hollywood movie director but do little to mute the sound of a bullet being discharged from a firearm. Suppressors do a similar job to lower the sound of a discharged bullet being fired, however, they only diminish the sound to a level that, sometimes, can keep one from damaging their ears, but usually don't reduce it below 130 decibels.
C'mon, this is completely off topic and the OP didn't ask for any opinion on suppressors and their validity in apparently every situation. Please delete or modify your post to reflect something useful to his query.
 

CBH Australia

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C'mon, this is completely off topic and the OP didn't ask for any opinion on suppressors and their validity in apparently every situation. Please delete or modify your post to reflect something useful to his query.
I used a 7mmRm in Africa, I did not see it being to long or to obtrusive for hunting. I think OP Willa get that from my short story. It’s my only relevant comment or experience to add.


I agree with this post
Two things you wrote I will refer to. (1.) Silencer is a totally fictional object that was the creation of some Hollywood movie director but do little to mute the sound of a bullet being discharged from a firearm. Suppressors do a similar job to lower the sound of a discharged bullet being fired, however, they only diminish the sound to a level that, sometimes, can keep one from damaging their ears, but usually don't reduce it below 130 decibels. (2.) 7mmRemMag ammo is a lot easier to find.
I think the term “Silencer” or the misnomer that surrounds it is why they are classified as a “Prohibited Weapon” in Australia. It requires a Police permit mostly restricted to Government agencies and law enforcement with few exceptions upon providing a “Genuine Need”

@Gone Ballistic post second point is useful to the OP enquiry

Point 2. 7mmRem Mag ammo is a lot easier to find. Good information from a resident of the same country considering some of the less common chambering mentioned.

Regarding ammo the same may apply in Australia should he wish to travel with the firearm. I expect that Australia and New Zealand offerings are somewhat influenced by the American consumer market and consumer preferences influence on manufacturer production and availability.

@JTH I hope this info is useful.
As for some short cartridges being built on long actions to house longer projectiles . I would say some love the research and the ballistics and happily outlay to pursue their interest. Maybe find a better mousetrap or may feel a new or obscure cartridge is more prestigious than say a 7mmRm.

A .308w is common in Australia, as a Hunting round I don’t think it holds the prestige or allure of the .270 but it is readily available. It’s “Common” but it works and is available in a variety of platforms.

I don’t think there is any disadvantage in using the 7mmRm. Maybe some others will gain a couple of hundred FPS. The rule of thumb is taking an inch off the barrel you lose 50fps and it’s. Been tested by chopping a barrel and getting real tested results that’s average somewhere close.

So a 22” 7mmRm is maybe starting at a slight disadvantage if velocity matters , and it may at extended ranges.

Maybe try google the various trajectories of a few cartridges or see if someone Run some ballistics software based on a preferred projectile and potential loads.

If you have a specific projectile or weight in mind start by comparing the chamberings against each other with that weight projectile as the benchmark

Google some comparisons, 280ai vs 7mmRm, 7mm WSSM vs 7mmRm, . 7mm SAW vs 7mm SAUM manny variables really

Others I have read about are .284 Shehane and the 7mmSAW both tested by an Aussie Long Range Hunter , ballistician and Engineer who produces Bolly Stocks



Sounds like. 7mmRm fits the bill but there are options. I built the .280ai based on some recommendations and then research to confirm my belief that it is a good thing, googling comparisons and trajectory tables. I don’t have ballistics software or that much knowledge, I didn’t address your question properly the first time so I was informed, oh well I like reading these forums and sharing what. I learned.

Basically settle on what you think is right and research enough to support your beliefs unless there is enough to the contrary, then rethink it.

If budget is a consideration then remember your smith might not have the obscure reamer required for chambering, the dies set Willa be dearer and the cases will be dearer so the initial setup. A hot cartridge might be a barrel burner too, that possibly affects the suppressor lifespan.

I built a .280ai, I think it could be rechambered to a 7mmRm if I wanted so starting with a shorter cartridge it could be remed out if the action and bolt face allow. In my case I could have it fitted in the .300wm action I have to make a .7mmRm, that’s just thinking outside the box. I expect the .280 ai is what I want in that lightweight build.

I hope some of this gives you a way to consider the options and recommendations and work them back too your requirements and preferences
 

Highlander44

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I own 2 280 Ackley’s and love them. I do not get 7RM performance, but very close. With 56gr of H4831 I get 2823fps out of a 26” barrel, shooting a 168gr VLD. It is loaded fairly mildly, and could go much hotter.
sure wish a newer S/A 7mm would come out with readily available brass. 7 PRC? That would be my one concern on several of the chamberings you mentioned. Have you looked around for brass availability first?
 

Send it 284

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I own 2 280 Ackley’s and love them. I do not get 7RM performance, but very close. With 56gr of H4831 I get 2823fps out of a 26” barrel, shooting a 168gr VLD. It is loaded fairly mildly, and could go much hotter.
sure wish a newer S/A 7mm would come out with readily available brass. 7 PRC? That would be my one concern on several of the chamberings you mentioned. Have you looked around for brass availability first?
Yeah that's no where near 7 RM velocity, 180s at 3050 is very common from a 26" barrel.
I agree with you though on a 7mm prc, it'd be awesome to have a cartridge that fell somewhere between a 7 RM and 28 nosler
 
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