January 3rd, 2013

Remington Introduces Affordable Model 783 Bolt Gun

Remington will introduce a new bolt-action rifle at SHOT Show, the Model 783. Remington positions the new model 783 as a mid-level offering between the Model 770 and Model 700 SPS, according to John Fink, Freedom Group Rifle Product Manager. This new rifle was first revealed in an American Rifleman article by Richard Mann, who tested an early production version in September 2012. Mann reports: “The ’7′ in the model designation comes from the 700 line of rifles, the ’8′ is kind of a throwback to the affordable but reliable model 788, which was discontinued 20 years ago, and the ’3′ is for the three in 2013. The suggested retail price is $451, but you can expect street prices to be closer to $400.”

Remington Model 783

Remington is claiming sub-MOA accuracy for the Model 783, as demonstrated by the “teaser” photo sent out to Remington customers earlier this week:

Remington Model 783

Remington Model 783

Remington Model 783Adjustable Trigger with Insert
The rifle features a polymer stock, cylindrical action, and an adjustable trigger with a control insert (as used on the Savage AccuTrigger and Marlin Pro-Fire trigger). Remington’s “CrossFire Trigger System” is pre-set at 3.5 lbs pull weight. According to the reviewer, Remington’s CrossFire Trigger is “similar in appearance to the Savage AccuTrigger and the Marlin Pro-Fire Trigger; it has a center lever that locks the trigger until it is fully depressed.” (We think selecting “CrossFire” as a product title was a dumb move by Rem’s marketing guys.)

Model 783 Has Barrel Nut System
Remington has borrowed a trick from Savage, employing a barrel nut system for fitting barrels to model 783 actions. The model 783′s two-lug bolt features a Sako-style sliding-plate extractor — this is a departure from the system on a Rem 700. Scopes can be mounted with two Model 700-spec front scope bases. However, Remington plans to offer integral scope mounts in the near future.

CLICK for Model 783 Review in American Rifleman | CLICK for Model 783 Photo Gallery

Designed for game hunters, the model 783 will initially be offered in four chamberings: .308 Winchester (short action), .270 Winchester, .30-06 Springfield, and 7mm Rem. Magnum. Remington says it will roll out more chamberings by the middle of 2013. In addition a compact-stock version with a shorter length of pull will be offered. Barrels are 22″ or 24″ with a “magnum contour”. Model 783 rifles will be produced in the Freedom Group’s Mayfield, Kentucky manufacturing plant.

Permalink Hunting/Varminting, New Product 15 Comments »
January 3rd, 2013

The Complexities of Neck Tension — Why Bushing Size is Only One Factor to Consider

Redding neck bushingsIn our Shooters’ Forum a reader recently asked: “How much neck tension should I use?” This prompted a Forum discussion in which other Forum members recommended a specific number based on their experience, such as .001″, .002″, or .003″. These numbers, as commonly used, correspond to the difference between case-neck OD after sizing and the neck OD of a loaded round, with bullet in place. In other words, the numbers refer to the nominal amount of interference fit (after sizing).

While these commonly-used “tension numbers” (of .001″, .002″ etc.) can be useful as starting points, neck tension is actually a fairly complex subject. The actual amount of “grip” on the bullet is a function of many factors, of which neck-OD reduction during sizing is just one. Understanding these many factors will help you maintain consistent neck tension as your brass “evolves” over the course of multiple reloadings.

Neck Tension (i.e. Grip on Bullets) Is a Complex Phenomenon
While we certainly have considerable control over neck tension by using tighter or looser bushings (with smaller or bigger Inside Diameters), bushing size is only one factor at work. It’s important to understand the multiple factors that can increase or decrease the resistance to bullet release. Think in terms of overall brass-on-bullet “grip” instead of just bushing size.

One needs to understand that bushing size isn’t the beginning and end of neck tension questions, because, even if bushing size is held constant, the amount of bullet “grip” can change dramatically as the condition of your brass changes. Bullet “grip” can also change if you alter your seating depth significantly, and it can even change if you ultrasonically clean your cases.

Bullet grip is affected by many things, such as:

  • 1. Neck-wall thickness.
  • 2. Amount of bearing surface (shank) in the neck.
  • 3. Surface condition inside of neck (residual carbon can act as a lubricant; ultrasonic cleaning makes necks “grabby”).
  • 4. Length of neck (e.g. 6BR neck vs. 6BRX).
  • 5. Whether or not the bullets have an anti-friction coating.
  • 6. The springiness of the brass (which is related to degree of work-hardening; number of firings etc.)
  • 7. The bullet jacket material.
  • 8. The outside diameter of the bullet and whether it has a pressure ridge.
  • 9. The time duration between bullet seating and actual firing (necks can stiffen with time).
  • 10. How often the brass is annealed

– and there are others…

Seating Depth Changes Can Increase or Decrease Grip on Bullet
You can do this simple experiment. Seat a boat-tail bullet in your sized neck with .150″ of bearing surface (shank) in the neck. Now remove the bullet with an impact hammer. Next, take another identical bullet and seat it with .300″ of bearing surface in another sized case (same bushing size/same nominal tension). You’ll find the deeper-seated bullet is gripped much harder.

PPC lapua brassNeck-Wall Thickness is Important Too
I have also found that thinner necks, particularly the very thin necks used by many PPC shooters, require more sizing to give equivalent “grip”. Again, do your own experiment. Seat a bullet in a case turned to .008″ neckwall thickness and sized down .003″. Now compare that to a case with .014″ neckwall thickness and sized down .0015″. You may find that the bullet in the thin necks actually pulls out easier, though it supposedly has more “neck tension”, if one were to consider bushing size alone.

In practical terms, because thick necks are less elastic than very thin necks, when you turn necks you may need to run tighter bushings to maintain the same amount of actual grip on the bullets (as compared to no-turn brass). Consequently, I suspect the guys using .0015″ “tension” on no-turn brass may be a lot closer to the guys using .003″ “tension” on turned necks than either group may realize.

Toward a Better Definition of Neck Tension
As a convenient short-cut, we tend to describe neck tension by bushing size alone. When a guy says, “I run .002 neck tension”, that normally means he is using a die/bushing that sizes the necks .002″ smaller than a loaded round. Well we know something about his post-sizing neck OD, but do we really have a reliable idea about how much force is required to release his bullets? Maybe not… This use of the term “neck tension” when we are really only describing the amount of neck diameter reduction with a die/bushing is really kind of incomplete.

My point here is that it is overly simplistic to ask, “should I load with .001 tension or .003?” In reality, an .001″ reduction (after springback) on a thick neck might provide MORE “grip” on a deep-seated bullet than an .003″ reduction on a very thin-walled neck holding a bullet with minimal bearing surface in the neck. Bushing ID is something we can easily measure and verify. We use bushing size as a descriptor of neck tension because it is convenient and because the other important factors are hard to quantify. But those factors shouldn’t be ignored if you want to maintain consistent neck tension for optimal accuracy.

Consistency and accuracy — that’s really what this all about isn’t it? We want to find the best neck tension for accuracy, and then maintain that amount of grip-on-bullet over time. To do that you need to look not only at your bushing size, but also at how your brass has changed (work-hardened) with time, and whether other variables (such as the amount of carbon in the neck) have changed. Ultimately, optimal neck tension must be ascertained experimentally. You have to go out and test empirically to see what works, in YOUR rifle, with YOUR bullets and YOUR brass. And you may have to change the nominal tension setting (i.e. bushing size) as your brass work-hardens or IF YOU CHANGE SEATING DEPTHS.

Remember that bushing size alone does not tell us all we need to know about the neck’s true “holding power” on a bullet, or the energy required for bullet release. True bullet grip is a more complicated phenomenon, one that is affected by numerous factors, some of which are very hard to quantify.

Permalink Bullets, Brass, Ammo, Reloading, Tech Tip 8 Comments »
January 3rd, 2013

Barnes .204-Caliber Varmint Grenade Bullets on Sale

Here’s a good deal for fans of the “Terrific Twenties” — .204-caliber, low-recoil cartridges. Midsouth Shooters Supply now has Barnes 26gr “Varmint Grenade” bullets on sale. Midsouth has marked down 250-count boxes of these 26-grainers from $36.74 (reg. price) to $31.99 (sale price). The promo price works out to just $12.79 per hundred bullets. If you have a .204-Cal rifle, and are planning a prairie dog safari or ground squirrel hunt in the months ahead, you may want to grab these bullets while they’re on sale. These 26-grainers will work with 20-Cal cartridges from the .204 Ruger all the way down to the diminutive .20 Vartarg.

Barnes .204 Varmint Grenade

Permalink Bullets, Brass, Ammo, Hot Deals 1 Comment »