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June 9th, 2024

Sunday GunDay: Savage Varmint Rig Becomes 300M Comp Rifle

300m meter Savage BVSS .260 Remington Shilen barrel Chassis prone rifle

Editor: This story by Tommy C. (aka “dc.fireman”) comes from our Shooters’ Forum. It’s fascinating to see how a relatively inexpensive Savage M12 BVSS varmint rig was transformed into a sophisticated 300M match rifle with a modern chassis, Shilen barrel, and top-of-line sights. With some ingenuity, and careful parts selection, Tommy created a rifle that can compete with match rifles costing many thousands of dollars more. American ingenuity at work!

300m meter Savage BVSS .260 Remington Shilen barrel Chassis prone rifle

Savage Reborn — Old BVSS Transformed into 300M Match Rifle

by Tommy C. (aka “dc.fireman”)
So, I began the project of building a 300M International competition gun, about a year ago, intending to compete at the 300M Nationals this year in Minnesota at the Minneapolis Rifle Club. Realistically, I didn’t want to pay the price-tag demanded of the Bleikers, Grunig & Elmigers, Hammerlis, or Tanners that (infrequently) pop-up for sale from time to time. So I decided to build my own 300M Match rifle with an American action, barrel, chassis, and trigger.

300m meter Savage BVSS .260 Remington Shilen barrel Chassis prone rifle
Here is Tommy’s completed 300M Match rifle with Savage action in PDC Custom chassis.

I had decided on the .260 Remington (aka 6.5-08) as the caliber choice. This beat out 6.5×47 Lapua simply due to the cost/availability of brass. The .260 Rem cartridge is based on the .308 Win parent. I made my first batch of brass by necking down some Federal .308, and it worked great. [Editor: We do recommend Lapua .260 Remington brass for match purposes for those who don’t have a supply of good .308 Win brass.]

300m meter Savage BVSS .260 Remington Shilen barrel Chassis prone rifle

I had an older Savage M12 stagger-feed action, originally from an old .22-250 BVSS. I contacted James at Northland Shooter Supply, and he walked me through the game plan and equipment I needed: Shilen Select Match 26″ barrel, NSS Stainless recoil lug and nut, a set of Forster headspace gauges, and the NSS action wrench.

300m meter Savage BVSS .260 Remington Shilen barrel Chassis prone rifle
Catalog photo of current Savage M12 BVSS in .22-250 Rem.

A few months later, I replaced the original Accu-trigger with a Rifle Basix SAV-II trigger, and immediately wondered why I waited so long to do that. The Rifle Basix is perfect for my application. Mind you the he safety DOES NOT work now, but, I don’t need it for my application.

Another member on the AccurateShooter Forum sold me a BVSS stock that has been re-worked by Alex Sitman of Masterclass Stocks, and it served as a placeholder, until I could find a maker who could nearly replicate my Feinwerkbau 2700 Alu stock in my smallbore match gun.

After scouring the AccurateShooter Forum, and multiple internet searches, I found PDC Custom in Michigan. I spoke with Craig Kierstadt a few times, before finally deciding to pull the proverbial trigger on his chassis. He had a few of the older chassis stocks with spacing for the Savage stagger-feed action. He machined an Anschutz rail into the fore-end for my hand stop and sling. Then he powder-coated the chassis black, and sent it to me sans grip and butt plate.

300m meter Savage BVSS .260 Remington Shilen barrel Chassis prone rifle
Photo of action/chassis. Tommy says: “It locks up really tightly, and you can tell Craig spent some time on the CNC work need to make this all fit.”

There are a few minor issues with the PDC chassis, but overall, I would rate this a 9.5 out of a possible 10. The price, and the features built into it, plus the ease of which everything fit together, far outweigh any minor issues. And two of the issues I quickly corrected with Teflon tape. I will need to make a walnut cheek piece — a curved one isn’t conducive to aperture iron sight shooting.

Savage Action .260 Rem 300M Match Rifle Components:

Action, Barrel, Stock, Grip
Savage M12 stagger-feed action, 4.27″ spacing
Shilen Select Match Barrel, 26″
Rifle Basix SAV-II Trigger
PDC Custom Chassis — tool-less adjustments
Bobsled SLED for single loading (required)
MEC Contact III Butt plate (German)
MEC handstop/sling swivel (German)
Walnut Target grip for AR-15 (eBay sourced)

Sight Components and Hardware
MEC Spy Long rear sight (German)
Centra front sight tunnel (German)
Centra adjustable aperture (German)
Medesha sight extension tube + collar
Champion’s Choice front sight base
Champion’s Choice mirage band

For his practice load, Tommy shot 123gr Hornady ELD-M bullets with H4831 powder and CCI BR2 primers. This load performed well — Tommy posted: “My 25-shot initial prone test today shows promise. There are five sighter shots, and 20 record shots. One of the 9s at 9 o’clock is my first sighter, the other one I own. The 8 out at 4 O’clock was a round that was difficult to chamber. My initial scoring puts me somewhere in the vicinity of 193-7X.”

300m meter Savage BVSS .260 Remington Shilen barrel Chassis prone rifle

The target used is the NRA C2, “300M International Rifle Target, reduced for 200 yards”.
The 10 Ring is 2.40″ in diameter, while the Inner 10 (X-Ring) is 1.24″.

Varget powder 300m .260 RemingtonMatch Load — Varget and Nosler Bullets
For his match load, Tommy switched to Varget and Nosler bullets: “My match load uses 37.9 grains Hodgdon Varget with a Nosler 123gr bullet. This was a recommendation by a gentleman with a lot of experience in 300M shooting.”

Tommy adds: “The amount of knowledge gained via the AccurateShooter Forum has made this all a reality, instead of just a passing thought.”

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June 9th, 2024

Riding the Wave — How Tuner Settings Alter Point of Impact

Tuner Pascal Bukys Point of Impact shift test 6 PPC benchrest

6PPC Pascal Fischbach Bukys Barrel Tuner sine waveHave a good look at the photos below — this may be one of the most noteworthy target strings we’ve ever published. What you can see is the effect of barrel tuner position on point of impact (POI). You can clearly see that the tuner position alters the up/down POI location in a predictable fashion.

This remarkable 15-shot sequence was shot by French benchrester Pascal Fischbach using his 6 PPC fitted with a CG (Carlito Gonzales) action and a Bukys barrel tuner.

Pascal reports: “After [bullet] seating and load validation, I put the Bukys tuner on, screwing it out 10 turns. According to Carlito, the CG’s super stiff action-to-barrel fit gives a faster vibration modulus that is detrimental below 10 turns [position of the tuner].” Pascal’s procedure was to screw out the tuner 1/4 turn progressively from one shot to the next. He shot one bullet at each tuner position, with a total of 15 shots.

15-Shot Sequence with Tuner Changes
6PPC Pascal Fischbach Bukys Barrel Tuner sine wave
CLICK HERE to SEE Large Version of Complete Test Strip (All 15 shots in a row).

Left Half of Target Strip (shots with 1/4 rotation change of tuner in sequence)
6PPC Pascal Fischbach Bukys Barrel Tuner sine wave

Right Half of Target Strip (shots with 1/4 rotation change of tuner in sequence)
6PPC Pascal Fischbach Bukys Barrel Tuner sine wave

Pascal observed: “Note the point of impact displacement [from shot to shot] tracks clearly along a sinusoide (sine wave curve).” This is indeed notable and significant! This shows how the tuner’s ability to change barrel harmonics can alter the position of the muzzle as each bullet exits, resulting in a higher or lower POI. Pascal sent his results to Carlito Gonzales in Argentina for analysis.

Pascal poses this question to readers: “Guess which three positions Carlito recommends to try?”

Editor’s Note: While this target sequence clearly shows how tuner position can alter bullet point of impact, this, by itself, does not tell us which tuner position(s) are best for accuracy. That will require further multi-shot group testing, involving careful experimentation with tuner position (and powder charge weights). But for those folks who doubt that a tuner can make a difference on a short, fat barrel, just take another look at the photos. The up/down changes are undeniable, and noteworthy in the wave pattern they follow.

Shooting Set-up and Test Conditions:
Pascal did this test at an outdoor range under very good conditions: “This was shot at my home range, outdoors, with four Smiley flag. The range is a narrow cut in high woods. Wind was consistent with readable flags. I started testing the tuner from 10 turns out and on to 15. I recently… found a sweet spot very close to the rearmost position of the tuner, so the rigidity provided by this super long tenon (just short of 70mm) was not a reason to overlook the recommended Bukys tuning procedure.”

6PPC Pascal Fischbach Bukys Barrel Tuner sine wave

Permalink Bullets, Brass, Ammo, Gunsmithing, Tech Tip 3 Comments »
June 9th, 2024

Predict Barrel Weight Accurately with Pac-Nor Calculator

Online Pac-Nor Barrel Calculator

pac-nor barrel weight contour calculatorCan you guess what your next barrel will weigh? In many competition disciplines, “making weight” is a serious concern when putting together a new match rifle. A Light Varmint short-range Benchrest rifle cannot exceed 10.5 pounds including scope. An F-TR rifle is limited to 18 pounds, 2 oz. (8.25 kg) with bipod.

One of the heaviest items on most rifles is the barrel. If your barrel comes in much heavier than expected, it can boost the overall weight of the gun significantly. Then you may have to resort to cutting the barrel, or worse yet, re-barreling, to make weight for your class. In some cases, you can remove material from the stock to save weight, but if that’s not practical, the barrel will need to go on a diet. (As a last resort, you can try fitting a lighter scope.)

Is there a reliable way to predict, in advance, how much a finished barrel will weigh? The answer is “yes”. PAC-NOR Barreling of Brookings, Oregon has created a handy, web-based Barrel Weight Calculator. Just log on to Pac-Nor’s website and the calculator is free to use. Pac-Nor’s Barrel Weight Calculator is pretty sophisticated, with separate data fields for Shank Diameter, Barrel Length, Bore Diameter — even length and number of flutes. Punch in your numbers, and the Barrel Weight Calculator then automatically generates the weight for 16 different “standard” contours.

pac-nor barrel weight contour calculator

Calculator Handles Custom Contours
What about custom contours? Well the Pac-Nor Barrel Weight Calculator can handle those as well. The program allows input of eight different dimensional measurements taken along the barrel’s finished length, from breech to muzzle. You can use this “custom contour” feature when calculating the weight of another manufacturer’s barrel that doesn’t match any of Pac-Nor’s “standard” contours.

Caution: Same-Name Contours from Different Makers May Not be Exactly the Same
One key thing to remember when using the Barrel Weight Calculator is that not all “standard” contours are exactly the same, as sold by different barrel-makers. A Medium Palma contour from Pac-Nor may be slightly different dimensionally from a Krieger Medium Palma barrel. When using the Pac-Nor Barrel Weight Calculator to find the weight of a barrel from a different manufacturer, we recommend you get the exact dimensions from your barrel-maker. If these are different that Pac-Nor’s default dimensions, use the “custom contour” calculator fields to enter the true dimensions for your brand of barrel.

Smart Advice — Give Yourself Some Leeway
While Pac-Nor’s Barrel Weight Calculator is very precise (because barrel steel is quite uniform by volume), you will see some small variances in finished weight based on the final chambering process. The length of the threaded section (tenon) will vary from one action type to another. In addition, the size and shape of the chamber can make a difference in barrel weight, even with two barrels of the same nominal caliber. Even the type of crown can make a slight difference in overall weight. This means that the barrel your smith puts on your gun may end up slightly heavier or lighter than the Pac-Nor calculation. That’s not a fault of the program — it’s simply because the program isn’t set up to account for chamber volume or tenon length.

What does this mean? In practical terms — you should give yourself some “wiggle room” in your planned rifle build. Unless you’re able to shave weight from your stock, do NOT spec your gun at one or two ounces under max based on the Pac-Nor calculator output. That said, the Pac-Nor Barrel Weight Calculator is still a very helpful, important tool. When laying out the specs for a rifle in any weight-restricted class, you should always “run the numbers” through a weight calculator such as the one provided by Pac-Nor. This can avoid costly and frustrating problems down the road.

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