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Shooting & Reloading - Mausers, Big Bores and others >> Rifles

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6.5 SAUM or 6.5 GAP 4S
      #317043 - 04/06/18 11:17 AM

Stopped by a friend of mine the other day who is a gunsmith in Helena..McLaughlin Firearms ..we were discussing other calibers and guns he is working on ..told me about several guns he as built in what he called the 6.5 GAP.. He told me he considers this one of the most accurate calibers he has ever built rifles in ..showed me targets of 5 and 10 shot groups that were incredible actually...plus he stated barrel life is very good..told me he built one for his 14 yr old daughter a year ago..last season she shot a antelope and deer with hers..stated it is very mild in recoil yet 3200fps in not excessive pressures..

Not promoting anything or anyone..just found this interesting and had not heard a lot of this caliber...

Copied this off of another blog post on another site:

The 4S stands for "super secret squirrel sh*t" and no , I'm not kidding. I shoot the 6.5 saum which is the same thing. 6.5 4S is GAP's reamer versions.

How can one resist anything that goes by "super secret squirrel shit"???

This was an article I found online also--there is not a ton of useful info out there it seems..


Let’s start with how this cartridge came about, from what cartridge family and why it is so efficient. The 6.5 SAUM is nothing more than just a 300 Short Action Ultra Mag or a 7 mm Short Action Ultra Mag necked down to a 6.5 mm caliber.Where does this cartridge comes from though? This cartridge is based off the 404 Jeffery case which Remington originally used for designing Remington Ultra Mag. The Remington Ultra Magnum is the big brother of Short Action Ultra Magnum and also built on the 404 Jeffery case. The Remington SAUM cartridges are built and made for running in a shorter action – the “short action ultra magnum” says it all.

Remington knew that with a wider powder column it was easier to get better velocities and an efficient powder burn with the entire powder charge in their popular 300 RUM and 7mm RUM. Remington also knew why to use a cartridge that did not have a belted magnum which is sought after by shooters and reloaders. In belted magnums the brass stretches and has problems with keeping it resized next to the belt as brass ages. The brass life tends to be longer in calibers without a belted cartridge.

Remington Arms made the 300 SAUM and 7 mm SAUM line of cartridges for multiple reasons. The shorter wider powder charge helps in setting off the charge more rapidly. This boosts efficiency and accuracy with a smaller and more efficient powder charge. With this being said you can run slightly shorter barrels and still have great velocities. This also helps to keep the barrel more rigid. In short the SAUM cartridges are a great cartridges for a more compact hard hitting hunting rifle.

6.5 mm SAUM has come about in the last couple of years because of the need of a cartridge that recoils less, hits hard, and gets the bullet to maximize its ballistic coefficients at all ranges. This also helps carry more bullet energy out at long ranges.

The advantages of 6.5 bullet in SAUM cartridge

Let me explain what advantages this cartridge has with a 6.5 mm bullet over the other size bullets in a SAUM cartridge.

A 140 grain 6.5mm bullet from the SAUM has speeds around 3200 fps with a 26” barrel and custom loads. This is compared to a 7mm SAUM which does about 2800 – 2900 fps with a 180 grain bullet. If you compare the ballistics on these two calibers it will show you the faster 140 grain 6.5mm will outperform the slower heavier 7mm bullet. It is all because of high ballistic coefficients and velocities on the 6.5mm bullet from the SAUM cartridge. Even though the heavier 7mm bullet is rated at a high BC it doesn’t have the initial velocities to maintain the energy and speed down range. The SAUM cartridge works great at pushing these 6.5mm 140 grain high BC bullets at great speeds with lots of energy. This is why necking the 7mm SAUM cartridge down to make 6.5 mm makes so much sense.

This caliber in the hunting situation or competitive shooting will benefit you greatly because it maximizes the speed and coefficient of the bullet and this helps to stabilize the bullet for extended long range shots. This also maximizes the amount of energy that it has when it impacts on the animals when you take a longer range shot. From close range to long range the 6.5mm SAUM is a complete performer and is not comparable to a lot of the other 6.5mm cartridges on the market today.

6.5 saum7 mm rem mag300 win magchart

To compare the 6.5mm SAUM to some of the other common magnum cartridges we need to go much larger such as 300 win mag and the 7mm rem mag. Let’s compare energy and velocities of these magnum calibers verse the 6.5mm SAUM.

Let’s do the comparison based on the following information: 500 yard shot, 5,000 feet of elevation and 50 degree temperature.

The 300 Winchester mag shooting a 180 grain bullet at 3,000 fps out of the muzzle has 2,000 foot-pounds and the velocity of 2,250 fps. At the same distance 6.5 mm SAUM shooting 140 grain bullet has 2030 foot-pounds of energy and the velocity is 2550 fps which makes this caliber a lot faster than a 300 win mag.

Now let’s compare its ballistics to another caliber such as 7mm Remington Magnum because it is such a popular caliber. With the 7mm Rem Mag shooting a 168 grain VLD (very low drag bullet) with a ballistic coefficient that compares to a coefficient of the 6.5 mm at the same ranges, the 7mm Remington magnum shooting a 168 grain bullet at 3,000 fps out of the muzzle at 500 yards the energy is 2100 foot-pounds and the velocity of 2,380 fps.

So in comparing the 6.5mm SAUM to these other common magnum cartridges it shows what kind of performer this caliber truly is, with just as much energy and higher velocities at 500 yards. We also just proved that the 300 win mag does not even compare with a 180 grain bullet. I don’t want to stop here, so let’s compare it further against the 7 mm rem mag with a high ballistic coefficient bullet.

At 1,000 yards 7 mm rem mag shoots 168 grain bullet with velocities around 1,840 fps and energy around 1,260 foot-pounds. This is more than enough energy to kill deer, elk, or most animals with a well-placed shot. Now let’s compare with a lot less recoiling, smaller cartridge, easier and more shooter friendly in a 6.5 mm SAUM. At 1,000 yards the 140 grain 6.5 mm bullet in the 6.5 SAUM does 2,000 fps and has 1,240 foot-pounds of energy. As you can see 6.5 mm SAUM has more velocity at all ranges .

At 1,000 yards the 6.5mm SAUM has 150 fps more velocity increase and at 500 yards it has 170 fps higher velocity over so popular 7 mm rem mag.

At 1,000 yards 6.5 mm SAUM has 350 fps more velocity than the 300 win mag and at 500 yards it has 300 fps more velocity then a 300 win mag. This shows you that 6.5 mm SAUM is a true performer out to a 1,000 yards

Abundance of great bullets for the 6.5 mm caliber

There are many companies who manufacture high BC 6.5 mm caliber bullets today. The 6.5 mm SAUM benefits from 140 grain and 130 grain bullets because of the higher BC that comes along with these bullets. Your choice of bullet should depend on what game you want to hunt or what kind of rifle competition you shoot. If you are only after a hunting rifle, you should stick with 140 grain bullet. There are several manufacturers that build amazing bullets with high ballistic coefficient for these cartridges. You can utilize the 130 grain bullet if you would like the recoil to be less and if you will be hunting smaller game like deer and smaller. If you are going to hunt larger game such as elk, the 140 grain bullet is important to keep the energy high and still provide a good knock down power.

As for competitive shooting, your choice of bullet depends on what kind of shooting you are performing. If you are doing a lot if positional shooting you may want to choose a lighter bullet for less recoil, so you can see more impact and stay on target. If you are only shooting from a prone position and you can limit the recoil and be able to see the impacts with a larger muzzle device to reduce recoil you may want to choose 140 gr and 142 gr bullets that are available today for match grade competition shooting. Either one works sufficient. There is slightly more recoil with the 6.5 SAUM compare to other widely used calibers in the competition world, but it works well.

Reloading for 6.5 SAUM

The easy and precise way to get 6.5 mm SAUM brass is to purchase a 7 mm SAUM brass from Norma, Nosler, or Remington and neck it down to the 6.5 mm size. The video below explains step by step on how to prepare 6.5 mm SAUM brass.

When reloading for this caliber there is a wide range of powders, bullets and other reloading components available today. As I mentioned earlier the choice of bullet should depend on how you will be using your rifle. Next you need to decide on what brass, primer, and powder you want to use. Once you figure out what brass you will use, the choice between 250 CCI, 210 M, or 215 M Federal primer will handle any of these cartridges needs for ignition. As for powder in my experience it seems that Hodgeon H1000 works the best. Hodgeon H4831SC and few of Reloader powders (Reloader 23 and Reloader 26) work in the cartridge as well. Powder charge for H1000 will range between 58 and 61 grains with good burn rates and efficient burns. Great speeds are easily obtained from a 24” to 26″ barrels in 3,100-3,200 fps.

There is wide range of node with this caliber. It is able to be loaded in a lot of different grain increments and you will have a very big window as far as finding your node for this caliber. I consider that as an advantage because you can choose from a lot of different powders in this caliber that will perform well. Between ease of loading and abundance of great bullets for this caliber 6.5 mm SAUM you are sure to find a great load.

Rifle of choice for family and youth hunts

Hunting and exploring in the great outdoors with your family is a great experience. As owner of BMP I am being asked a lot of what caliber would be suitable to take on a hunt with a family. Would the 6.5 mm SAUM work good for the family? My answer is yes. In my eyes, this cartridge is the best family hunting cartridge and here are the reasons why:

the rifle can be compact – you can utilize this rifle with a short barrel. A 22″ barrel can easily get the speeds up to 3,000 fps with a 140 grain bullet
rifle weight can be reduced by using a carbon fiber barrel, carbon stock, and a short action – which makes carrying the rifle much easier for youth or even experienced high country hunters
the recoil is minimal with muzzle brake so a youth shooter can see the impact.
the performance of this cartridge is outstanding which is very important for growing self-confidence of younger and less experienced hunters. Not all 6.5 mm cartridges give you such amazing shooting results as 6.5 mm SAUM does
6.5 SAUM cartridge highlights:

The 6.5mm Remington short action ultra-magnum cartridge is a necked down version of the 7mm or 30 caliber SAUM cartridges
It can be utilized in short action bolt action rifles with a magnum bolt face and 3” plus magazine box
Loaded in performance, accuracy and efficiency
Better compact ability and reduced recoil over other larger magnum calibers.
Dominates the world of competitive shooting and long-range hunting
Has tons of velocity and knock down power at extended ranges


Edited by Ripp (04/06/18 11:21 AM)

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Re: 6.5 SAUM or 6.5 GAP 4S [Re: Ripp]
      #317073 - 05/06/18 08:08 AM

OK as I understand it the 6.5 GAP Super Secret Squirrel Shit (Love the name ) is just a 6.5 SAUM or is the a slight difference in the case somewhere?

A few blokes on one of the forums over here have made up 6.5SAUM's and love them. If I ever need to rebarrel my 300SAUM that is what it will be.

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Re: 6.5 SAUM or 6.5 GAP 4S [Re: Rule303]
      #317095 - 06/06/18 02:00 AM


OK as I understand it the 6.5 GAP Super Secret Squirrel Shit (Love the name ) is just a 6.5 SAUM or is the a slight difference in the case somewhere?

A few blokes on one of the forums over here have made up 6.5SAUM's and love them. If I ever need to rebarrel my 300SAUM that is what it will be.

Yes,, I believe that is correct...

Agree, those I have talked to in the past few days as well as the gunsmith says he has had incredibly accurate rifles in that caliber..long barrel life..low recoil.. all in a 6.5..so great ballistics..

My gunsmith is going to let me try his out in a few weeks when I am back up there..he also said he only used Norma brass..doesnt like Hornady brass.. which I tend to agree with..



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Re: 6.5 SAUM or 6.5 GAP 4S [Re: Ripp]
      #317096 - 06/06/18 04:43 AM

Very interesting.


"a rifle without hammers, is like a Spaniel without ears" Edward VII

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Re: 6.5 SAUM or 6.5 GAP 4S [Re: Rule303]
      #317111 - 06/06/18 04:13 PM


OK as I understand it the 6.5 GAP Super Secret Squirrel Shit (Love the name ) is just a 6.5 SAUM or is the a slight difference in the case somewhere?

A few blokes on one of the forums over here have made up 6.5SAUM's and love them. If I ever need to rebarrel my 300SAUM that is what it will be.

I had one made up on a Mod 70 EW WSM. Was very nice. Then I sold it

Must do another....

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Re: 6.5 SAUM or 6.5 GAP 4S [Re: Rockdoc]
      #317151 - 08/06/18 07:05 AM

G'Day Fella's,

Thanks for sharing Ripp.

The 21 century, certainly appears to be the second era of 6.5mm cartridges.
We are a bit slow I suppose, as the Europeans worked it out a long time ago.

These new 6.5's, also look to be great options for both Huntin and long range shootin.


"Beware the Lolly Pop of Mediocrity,
Lick it Once and You Will Suck Forever"

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