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My experience was the B.O.S.S. takes a fair amount of ammunition to find the right setting for the particular load you’re shooting. If the device is mounted on a .338 WinMag, the muzzle brake would likely be welcome, although pity the shooter at an adjacent bench. The device works but different loads require different settings and a lot of ammunition to prove out. Even the old .25 Niedner would grow tiresome before those jobs were done.
Although anathema to young hunters, the late Jack O’Connor, a grand slam sheep hunter several times over, wrote that his several game rifles [built by Al Biesen, Lenard Brownell, Earl Milliron, Alvin Linden, and other top-shelf custom gunmakers] typically shot 100 yard, 5-shot groups of about 1.3 to 1.8 inches, although on a good day, from time to time, some could do a little better.
Under field conditions, I think most factory hunting rifles don’t require the additional accuracy the B.O.S.S. device offers. My principal objection to it was Browning [and I think Winchester] shortened barrels to keep overall length down. The 25/06 in question has a 20″ barrel, which sort of works against the intended design and purpose of the cartridge.
For my purpose, however, helping a 12 year old learn to handle and shoot a centerfire rifle without developing a flinch, the A-Bolt and 250-3000 power level handloads were perfect.
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
Zebulon said
If ambient air temp makes a difference in tuning, does density altitude matter as well? I know it affects marginally stabilized bullets.Here’s a question you can help.me with, please. As you can see, my son’s B.O.SS.S.has a perforated section that serves as a brake. Browning offers a replacement part (user installable) that is unperforated and thus much quieter. Do you think eliminating the brake would adversely affect the tuning function of the device? Because BACO offers the part I would guess not but would value your opinion.
I did a lot of research and talked to a lot of competitive shooters and the number 1 thing that effects groups is the temperature. Density altitude is the sum of all the weather conditions factored in. Almost all race teams have a weather station and track density altitude. I have a Kestrel that will figure all of that out but temp is by far the biggest factor.
If you remove any weight from the barrel you point of impact will change. Many classes won’t allow muzzle breaks but tuners can be used.
Got it and thanks. That makes sense. Projectiles aren’t airfoils.
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
Zeb and Chuck, I am way behind the power curve on knowledge for bench rest shooting. I’ve asked questtions and factored out the dubious answers some like to provide newbies asking them. I’ve also read some. I get downright terrified by some of the crap on line, specifically in regards to powde charges. One thing I have learned is that at least some competitors reload at the range just before they shoot. They check weather conditions and resort to their precious notes to determine the load for that day and at that range. One article (I no longer recall from whence it came) showed a serious competitor with a homemade bench on the passenger side of a brand new Buick! Attached solidly to the dash where the glove box used to be. The competitor and gunsmith I got my bench rest rifle from only loads and shoots the same five pieces of brass, reloading between his time on the bench. Our local matches require 10 shots, so mostly follow with 10 main pieces of brass with several spares since I had some primers fail to ignite. I am not sophisticated enough to measure atmospherics and record them but keep shooting the same powder charge for the 5 weeks of competition. Maybe as I get older and less able to shoot other disciplines I will start measuring and playing the game seriously. I sure would like to be able to repeat my Sep 2024 feat. Tim
Tim,
Sophisticated or anal retentive?
Bill
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
Zeb, take your pick as the end result is about the same! How many angels can dance on the head of a pin?! But the search is on to try and eliminate as many variables as possible and thus shoot very tiny shot groups. I am still the main factor that limits the performance on target. I shot spring and fall for over 10 years trying to shoot a quarter inch 10 shot group at 100 yards with my light bench rest rifle (LIGHT is a comic misnomer as it weighs a lot!)/. I sent a picture of my best group to Chuck I think. Sep of 2024 I shot a 0.191 inch, 10 shot group at 100 yards. 6mmPPC caliber. Somehow I did the same thing each time. Often I have had a similar 8 or 9 shot group, then double it with the last shot as I do something different. I feel it, I see it on target, but can’t tell just what I do differently so I can eliminate it. But I shoot so many disciplines I don’t really practice nor make written notes. We shoot but 5 weeks each league so get relatively little true trigger time in that manner. I have had a couple of great shot groups at the beginning when shooting for practice and to develop my loads, but they weren’t witnessed and don’t count. You tell me–anal or just what? Tim
tim tomlinson said
Zeb, take your pick as the end result is about the same! How many angels can dance on the head of a pin?! But the search is on to try and eliminate as many variables as possible and thus shoot very tiny shot groups. I am still the main factor that limits the performance on target. I shot spring and fall for over 10 years trying to shoot a quarter inch 10 shot group at 100 yards with my light bench rest rifle (LIGHT is a comic misnomer as it weighs a lot!)/. I sent a picture of my best group to Chuck I think. Sep of 2024 I shot a 0.191 inch, 10 shot group at 100 yards. 6mmPPC caliber. Somehow I did the same thing each time. Often I have had a similar 8 or 9 shot group, then double it with the last shot as I do something different. I feel it, I see it on target, but can’t tell just what I do differently so I can eliminate it. But I shoot so many disciplines I don’t really practice nor make written notes. We shoot but 5 weeks each league so get relatively little true trigger time in that manner. I have had a couple of great shot groups at the beginning when shooting for practice and to develop my loads, but they weren’t witnessed and don’t count. You tell me–anal or just what? Tim
Believe me, Tim can shoot. I have that picture somewhere and when I find it I’ll post it.
I’d recommend Leupold STD 2-piece bases. They are known for their solid and reliable mounting solution.
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