Modern Sporting Rifle Evolution
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Dogtired

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So my questions are simple. Hope the answers are too [smile]

1) How much realistic yardage do I gain with a 22-24" barrel over the 20", if I am.shooting 85gr Nosler eTips. Looks like a 20" barrel can be loaded to accurate speeds of about 3000fps, which gives 1000 ft/lbs out to about 300 yards. Is there much real benefit to waiting for a 22+24" barrel? IDEALLY, I'd like to have something that's good to 350 (I prefer the gun to be more capable than I am) so I have greater flexibility at the margins, but I'm not sure another 2-4" will give me that much more past 300 yards, but I truly have zero idea.

2) Is anyone making brass for it? Outdoor Shooting Supply seems to have stopped. I know it's easy to makes and I will do it some day, but I have little time and a lot of pain and,if it isn't insanely priced, would like to buy up to maybe 500 pieces of fireformed brass just to make the process easier.

I'll be selling one of my 223s to find this, and don't want to end up with regrets at the end of the day [wink]
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mnwhiskeyman

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good question
I believe that this is fully capable out to 600 yards for sure. I will be using it for fclass this year to that range
a couple of users have had good use out of the 70gr tnt as have I and I have an 18inch barrel
Many on here are still playing with the round.
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Jdkinsey90

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I think it was kdbaker that was running his out to 300 yards class f match. If you're interested I have a 20" 1-8 twist with target crown that I'm parting ways with because I want a spiral fluted barrel. I was running nosler 95gr bt and was having great success. I was hoping to get 200$ for it but I'd thrown in 100 fire formed brass with it. They've been fired once and they're all good to go with this barrel.
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RangerJoe

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Reply with quote  #4 
DT: http://mdws.forumchitchat.com/post/shooting-the-mongoose-at-300-yards-with-my-little-18-barrel-8204555?pid=1293517690

General rule of thumb is you can gain 20~25fps per inch of barrel, with optimum powders and conditions.  Obviously this is a performance curve... a 12-foot long Mongoose barrel isn't going to yield hyper-sonic muzzle velocities. Whether you can safely push an 85gr bullet to 3,000fps from a 20" barrel or not, I can't confirm.  IF you could, and IF the powder was optimal for a longer barrel... you might gain 80~95FPS going to a 24" barrel; that might extend the 1,000ft/lb energy threshold from ~300 yards to ~330.

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RangerJoe

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Quote:
Originally Posted by mnwhiskeyman
I believe that this is fully capable out to 600 yards for sure.
For punching paper or one-shot kills on big game?  IF one could achieve 3,000fps with the 85gr bullet, there would be less than 560ft/lb energy with over 80" drop at 600 yards. 

As much as I herald the virtues of the 6mm Mongoose, I'd be hard pressed to select it for a 600 yard shooter.

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