Subsonic .308 Newbie guidance

Sivispacemparabellum022

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Jun 18, 2017
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Ok guys, I’m not new to the reloading scene but I am new to subsonic. The atf finally decided to approve me after more then 12 months. I’d like to start reloading for my .308 savage. I don’t even know where to start. I can’t find anything in my books, I’ve research some online, seems most that I saw were using trail boss and 175gr and heavier. Is trail boss the best? Can you use you IMR’s or Vargets for subs?
 

Awag1000

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Jan 17, 2020
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Ok guys, I’m not new to the reloading scene but I am new to subsonic. The atf finally decided to approve me after more then 12 months. I’d like to start reloading for my .308 savage. I don’t even know where to start. I can’t find anything in my books, I’ve research some online, seems most that I saw were using trail boss and 175gr and heavier. Is trail boss the best? Can you use you IMR’s or Vargets for subs?
from my knowledge of reloading subs Trail boss works best because its a less dense almost "fluffy" powder. 11gr of trailboss almost touches the base of the bullet for my 208gr ELDM loads compared to the same weight of Varget just barely covering the bottom of the casing. so to answer your question, you "can" use varget/imr for subsonic ammo Trail boss is the better option though. heres a link to an article about Trailboss in 308 https://rifleshooter.com/2017/09/reduced-308-winchester-loads-with-trail-boss/
 

Guns&WhiteWater

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Feb 21, 2017
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I have limited experience with subs in my shorty 308, but here’s what I’ve got. 110 V-Max with one level 3.1 cc scoop using Lee’s kit (15 grains +/- 0.5) of IMR Trailboss, Win primers, mixed brass (HSN, Nosler, Win) loaded to 2.490”. Worked OK on tin cans in the backyard. Quite, but nothing like my 300 BLK and Titegroup. No experience with the heavies.

And no, I wouldn’t use Varget. Be careful with reduced loads on most powders.
 

Awag1000

AKA: Space Nuts Actual
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Jan 17, 2020
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I have limited experience with subs in my shorty 308, but here’s what I’ve got. 110 V-Max with one level 3.1 cc scoop using Lee’s kit (15 grains +/- 0.5) of IMR Trailboss, Win primers, mixed brass (HSN, Nosler, Win) loaded to 2.490”. Worked OK on tin cans in the backyard. Quite, but nothing like my 300 BLK and Titegroup. No experience with the heavies.

And no, I wouldn’t use Varget. Be careful with reduced loads on most powders.
reduced loads with rifle powders can fail to Ignite or give you squibs (from what I've heard, if I'm wrong please correct me)
 

leftyk82

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Oct 8, 2014
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My load was using Trail Boss and Sierra 220g round nose projectiles. I landed on 10.1g of TB seating those bullets at 2.8" OAL. Shot them out of a suppressed 20 inch barrel, quiet as can be.
 

Mooseknuckles

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My experience with subs is pretty much the same as the other posts, 10.5-11 grain of trailboss ( can’t remember load exactly right now) with a 208 amax seated at 2.850. Get me right at 1050-1070.
 

Gunfighter14e2

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Can you use you IMR’s or Vargets for subs?
Yes those can be used, rather expensive but they have there place depending venue. I would suggest you get a ton of experience with subs using TB an fast burning pistol/shotgun powders before using those, unless you have The ABILITY to REGROW body parts.
Depending on your goal (paper/steel vs meat/varmints) or just plinking there are many different powders from the fastest to the slowest that will work better for a given combo in a give venue. There are 1/4 moa sub loads that will dot an eye every time at XXX yardage, but suck past XXX range, then there are sub loads that will do an eye socket too XXX range but are worthless anywhere else on the same critter. Then there are loads that will drop a 300# critter if placed into a vital spot but are 1.5-2 moa loads. The sub world is much harder to work in vs high speed, do to all the variables that come into play with such low pressure. In the H/S world most of these minor variables are not even given a second though.
Remember when you pull the trigger an the firing pin starts to move, if you have hosed up that load you will find out very quickly. Double charging a sub load can be dangerous, an double charging with a wrong bullet,... WILL BE,... a life changing event,...many have had to learn this lesson the hard way. Go slow, an record everything an you will start to see a pattern with all combos, once you fully understand what is happening, then start stepping you game up.
 

Capnted

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Jul 30, 2020
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Ok guys, I’m not new to the reloading scene but I am new to subsonic. The atf finally decided to approve me after more then 12 months. I’d like to start reloading for my .308 savage. I don’t even know where to start. I can’t find anything in my books, I’ve research some online, seems most that I saw were using trail boss and 175gr and heavier. Is trail boss the best? Can you use you IMR’s or Vargets for subs?
I am also a subsonic nubie and have been reloading for over 40 year. I just started some subsonic research this week. It seems a good powder to start with is IMR Trail Boss. There is a good article at:

Read more: https://www.ammoland.com/2017/03/subsonic-308-win-handloads/#ixzz6TdAoX4nT
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Subsonic .308 Win Handloads – Testing & Understanding

Ammoland Inc. Posted on March 23, 2017 by Josh Wayner


By Josh Wayner