Came by what appears to be a new take off Browning barrel with the Boss system . Just curious if anyone has any experiece with the Boss. Does adjusting this thing actually decrease the group sizes ?? Thanks for any input

Yes it acts like a muzzle brake and barrel tuner, Winchester/Browning were ahead of their time with the BOSS System.
This type of accessory today will set you back from $150 to $300 Canadian in my neck of the woods.
BB

When FN brought the BOSS system to the US from French sniper rifles.. true story.. the French or FN made a sniper system and tuned the barrels to the lots of the march grade ammo.. when you change from one kot to the other, you changed the BOSS to match the ammo.

Thanks for that. With a micrometer like adjustment what did most do? Start at 0 and try every number up to 10? or start at 5 and try up and down(6& 4) and then go the direction there was some improvement ??

Most guys didn't have the patience to actually adjust them, and gave up, and I have cut many of them off.
Another dumb idea just to sell rifles to the gullible shooting public.
But yes, you could fine tune your barrel in one of two ways; just like working up loads. Either move it up in small increments until a node was reached that gave smaller groups, or adjust it like Artillery and make bold adjustments and work from there.
Here is how to adjust them; they even give you a Sweet Spot Chart to start from. They guarantee one hole groups.
https://www.browning.com/suppo...-0mrbK41HQkys5YpDG9F

Bob we posted this at the same time!

I believe that you mare moving the weight of the barrel forward or backwards (longer/shorter) which would change the harmonics of the barrel.

Hip

Correct; there are "barrel tuners" on the market too.

quote:

Originally posted by Hipshoot:
I believe that you mare moving the weight of the barrel forward or backwards (longer/shorter) which would change the harmonics of the barrel.

Hip

AND left and right .. well, frankly, 360 degs -- as barrels don't just WHIP in the vertical, there is also a good deal of other directions -- and you can't stop it, but you CAN "tune" it ...

and if you can get it to release at the same point, all the time, that's an additive factor in precision (which can lead to accuracy)

Thanks again for the info. I can see this is going to keep me busy for a while this summer. after viewing the Sweet Spot chart I see for the 300 Win with 180 gr bullets the sweet spot for Win ammo is 0.5 and for Federal 180 gr ammo the sweet spot is 8.5. Since my rifle will likely never see factory ammo the sweet spot chart is pretty much useless to me. Looks like working up a load and then shooting a 3 shot group at each setting from 0 to 9 to see for any improvement in group size

You could adjust it to the halfway mark and develop your load there. Then shoot groups lower and higher than that point to find your "sweet spot".

Bob I appreciate your input. I don't quite understand what the difference is starting from 0 and working up to 9. Or starting at 5 and working up and down to 9 and 0 ?????

There is a reason they didn't make this thing any more.

If you alternately fire + and - groups you will likely pickup a trend and focus your efforts one way or another. Lets say you work a load up at 5 that prints 1.5 inches. You shoot a group at 4 that prints 1.75 inches . Then one at 6 that prints 1 inch. You can then focus on the higher numbers rather than run through all of the low numbers. But, if you don't care about time and rounds, then starting at 0 and shooting 3 shot groups at every number is fine.

quote:

Originally posted by snowman:
Bob I appreciate your input. I don't quite understand what the difference is starting from 0 and working up to 9. Or starting at 5 and working up and down to 9 and 0 ?????

If you do it with 3-shot groups you will be chasing your tail forever.

You need larger sample sizes.

This got me thinking.

This needs a relatively comprehensive test.

Difficult with center fire for the amount of shooting that needs to be done.

But, what about doing it with a 22 rimfire??

I have a tuner that has 22 full turns.

And each turn has 24 clicks!

At each of the 22 full turns.

That is 528 combinations!!

Quite impossible to do, as my thought is shooting 5, 5 shot groups each.

So, how about shooting groups at each full turns.

Then once the best group is found, shoot a group at each click, either side??

Would 50 yards or 100 yards be best??

All this is why this ugly contraption screwed onto the muzzle of your rifle, is no longer made; tedius to make it work, with limited improvement; just take the rifle as is and kill stuff with it. Gaining .1 MOA is not worth the time, expense, and trouble.
How many custom rifle makers use them? Zero.
How many of you top successful big game hunters use them? One.
I would not take one for free.
If it was such a good idea, they would still make them.
Concentrate on load development, traditional good shooting techniques, and go hunting. As S pointed out, there are almost unlimited permutations/combinations/iterations involved in testing the boss, and ammo loads.
Of course the boss was intended for factory loads.....

Well, we shoot quite a lot for the same of shooting.

Might as well try to see what the results might be.

All is punching hole in paper!

Just got 10,000 rounds of ELEY MATCH.

Would be good to put it to good use.

Well, that backfired!

I thought I will use an ANSCHUTZ 5418 MS-R rifle for this.

Tried the ELEY MATCH.

All shot one hole in varying size!

Not going to work.

So I will see what ammo I have that is not as accurate, in qualtity, and try that.

Problem solved!

Moved targets to 100 yards.

I will post my results on the RIMFIRE FORUM!