MGM Preferred & Brux

[ourway77]

Here is the group I shot today with my Knight/brux 45 caliber 1-20 twist 60 grains IMR-4198 225 Fury bullet harvester blue sabot First 4 shots adjusting shots 100 yards off the bench Those Fury bullets are really good and the price is right Next outing I am going to try the 250 Fury bullets Lou smokeless

 

[WPrather]

What am I missing?

If I ordered a 26in MGM 45/70 barrel and sent it to ASG. Paid ASG to convert that barrel to smokeless with there carbide bushing 209 Breech plug. How would that not be exactly the same barrel MGM sells right now?
MGM muzzeloader barrels have ASG carbide bushing 209 breech plugs in them. What else do they do on a 45/70 conversion?

I don’t know if MGM sends barrels to ASG to have breech plugs installed. Or if ASG just sells MGM breech plugs. Either way the MGM muzzeloader barrel that MGM sells and the MGM/Preferred barrel ASG sells. Both have ASG carbide bushing breech plugs in them. The only difference I see is one is .810 heavy factory contour and 1 is 1in full bull.

If you go to ASG’s site there not even offering Encore 45/70 conversions anymore. Because the MGM drop in replacement barrels are so good. Lol

 

[jims]

Nice shooting.

 

[lwh723]

Interesting read. Lots of "information" that I wasn't even aware of.

1) The Preferred barrels I sell are a select grade (more stringent grading). They are very consistent breech to muzzle for optimum sabotless shooting.
2) The barrels I sell come with a base
3) My barrels are compatible with either the ASG209 plug or the ASG Gen2 LRMP BP System
4) I was selling ASG/MGM/Preferred barrels way before HOA
5) The plug in the MGM ML is substantially shorter than the standard ASG209 plug. It would not be a good smokeless plug.
6) Never use smokeless powder in a gun marked blackpowder only.
7) Sabots are fine in either 6L brux or 5R preferred. I got tired of people not listening and going out and trying to shoot rapid fire groups with sabots in 80F weather. So I don't guarantee accuracy with sabots anymore.

 

[GM54-120]

I thought the plugs were different.

MGM plug

Description
Features:

• Our plugs are conventional 360 degree threaded with 9/16″-24 threads and a maximum diameter of .625″, which means they are optimized for both of the T/C’s
• This breech plug comes standard with a tungsten carbide bushing. The tungsten carbide has greatly improved wear resistance from heat and pressure. This means the 0.030” flash hole through the bushing (which is the optimal orifice size for BH209) stays the same shot after shot
• These plugs are manufactured to very tight tolerances to allow interchangeability between plugs and maintaining perfect headspace.
• We headspace these plugs using Federal 209A primers, which is proven time and time again to be the standard for precise and reliable black powder ignition.
• 45/70 conversions are possible with this plug. Make sure existing scope mount holes aren’t too deep on G2 barrels before installation. We make special accommodations for this plug install on G2 barrels. Always be sure to use a reputable gunsmith for any install with our plugs. We will not be installing these plugs on any already existing barrels no matter the manufacturer or condition.
• 100% billet machined, heat-treated, and black oxide finished in USA

ASG smokeless grade plug

9/16-18 threaded rear seal 209 plug. Fit for bushings and can be removed with a 7/16" socket. Made from 416 heat treated stainless steel.

Advantages:
-The smaller diameter results in less barrel material being removed during install.
-Rear seal isn’t prone to gas cutting
-Threaded for over 1.25”

 

[WPrather]

First thank you for coming on here and answering my questions. I asked them because I don’t know the answer and figured somebody did. If you don’t know something you ask someone who does right?

So I have one more question. All break action guns breech plugs are substantially shorter than standard 700 plugs right? Because a 700 has a action and a break action don’t. So the scope mount holes on a 700 are on the action not the barrel. On a break action gun the scope mount holes are on the barrel itself. So on a break action the scope base is set forward and the breach plug is made shorter. So the breach plug don’t get into the scope base holes. Because there wouldn’t be much material left. That’s why a break action you only suggest 65grs at 2500fps and a 700 is 78grs at 3,000fps.

 

[WPrather]

That’s a picture of a 700 plug versus a break action plug.

 

[WPrather]

Alright I don’t know what happened there. But on those ASG LRMP plugs the long plug is a 700 plug and the short plug is a break action plug.

The the break action plug is shorter for a reason. The break action LRMP plug and the MGM 209 plug are both 9/16x24.

Hankins has a video on YouTube showing the difference in the lengths of the 700 and break action plugs. He tells you the reason for it.

 

[GM54-120]

209 plugs for smokeless need more flash channel volume than a LRMP plug to keep peak pressures on the primer lower. My NULA plug is super short but it does not see the same amount of dwell time or peak as a 45cal sabotless with a slower powder. Mine also completely encloses the 209 primer. None of the primer other than the rim is not IN the breach plug.

You would have to shoot some monster BH209 loads to break 31kpsi.

 

[Boonechaser]

Alright I don’t know what happened there. But on those ASG LRMP plugs the long plug is a 700 plug and the short plug is a break action plug.

The the break action plug is shorter for a reason. The break action LRMP plug and the MGM 209 plug are both 9/16x24.

Hankins has a video on YouTube showing the difference in the lengths of the 700 and break action plugs. He tells you the reason for it.

The plug in my Remington 700 smokeless is the exact same plug in my Encore. Sam 9/16-24 and 1.5”s of thread. The forward set on the scope mount is for better eye relief and has nothing to do with the length of breechplug

 

[Boonechaser]

Sorry typo, both are 9/16-18 thread.