Tuning Boss Muzzle Breaks
- Thread starter BIG
- Start date
C
Colville
Guest
go to browning on line. They have a video how too on the matter. Unfortunately, you "tune" each load so if you are fond of a variety of weights and construction you'll have to re-tune.
That said, I could get a 1/2 inch pattern with a good tune job and then was still at about 1 moa on the other load I normally shoot so I just left well enough alone. Don't remember the steps but probably have the tape rat holed someplace around here.
That said, I could get a 1/2 inch pattern with a good tune job and then was still at about 1 moa on the other load I normally shoot so I just left well enough alone. Don't remember the steps but probably have the tape rat holed someplace around here.
N
NM_Muley_Hunter
Guest
With my .300 win mag, I picked the load I wanted to shoot, and started at the boss setting 5.0. I then shot 2 shot groups (or 3 shots if one shot didn't feel good) and moved to 4.0, 3.0, etc. I then went up from 6.0, 7.0, etc. Once I had shot from 1 to 9 (I decided not to go to 0 and 10), I looked at the target and measured. I had the best results between with settings 7 and 8 (under an inch at 100 yards)...the other settings all opened up more (1.5 inches or so). Then I shot 3 shot groups at 7.2, 7.5, 7.7, and 8.0. I got my best group at 7.5, so I've stuck with it since. It now shoots under an inch at 200 yards...hard to complain with that.
My reasoning for only shooting 2 shot groups was that if the shots felt good and the group was an inch and a half, I thought I could do better. After all, if the first two shots are over an inch and a half, it is impossible to shoot a third shot and get a better group. If the first two shots were under an inch, I knew I might have something to work with.
I've tried a few types of bullets that I couldn't get to group 2 shots under an inch and a half with any setting. I've pretty much scrapped those bullets, thinking they just don't shoot well out of my gun.
After experimenting further with different loads, I've generally found that all loads out of my gun tend to shoot best at similar boss settings with the same bullet weights (powder, primers, etc did not seem to have much effect). That is, 180 grain bullets (no matter what brand) all tend to shoot the best from about 7.5 to 8.5 out of my gun. Other bullet weights shot better at different settings. Granted, that may just be a quirk of my gun...but if you only switch bullet types or brands (but are shooting the same bullet weight), and you already know where your gun shoots a different bullet of the same weight best, it may be a good idea to start at the same setting as other bullet types/brands shot best.
It takes a little shooting, but it is worth the time...and it is a good time to familiarize yourself with your rifle.
My reasoning for only shooting 2 shot groups was that if the shots felt good and the group was an inch and a half, I thought I could do better. After all, if the first two shots are over an inch and a half, it is impossible to shoot a third shot and get a better group. If the first two shots were under an inch, I knew I might have something to work with.
I've tried a few types of bullets that I couldn't get to group 2 shots under an inch and a half with any setting. I've pretty much scrapped those bullets, thinking they just don't shoot well out of my gun.
After experimenting further with different loads, I've generally found that all loads out of my gun tend to shoot best at similar boss settings with the same bullet weights (powder, primers, etc did not seem to have much effect). That is, 180 grain bullets (no matter what brand) all tend to shoot the best from about 7.5 to 8.5 out of my gun. Other bullet weights shot better at different settings. Granted, that may just be a quirk of my gun...but if you only switch bullet types or brands (but are shooting the same bullet weight), and you already know where your gun shoots a different bullet of the same weight best, it may be a good idea to start at the same setting as other bullet types/brands shot best.
It takes a little shooting, but it is worth the time...and it is a good time to familiarize yourself with your rifle.
A
AZWALKER
Guest
Its funny I just asked this question on another website and this is what a very helpful friend sent me.
This chart can be found on the Browning site under the Faqs tab.
Q. I have a Browning rifle with the BOSS. What is the "Sweet Spot" setting for my firearm?
A. The following are suggested "Sweet Spot" settings for Browning rifles that have the optional BOSS (Ballistic Optimizing Shooting System) attachment:
--------------------------------------------------------------------------------
Suggested "Sweet Spots"
Caliber Bullet Weight Ammo Manufacturer A-Bolt
Average
Sweet Spot* BAR
Average
Sweet Spot
375 H&H 270 2.3
375 H&H 300 4.5
338 Win. Mag. 250 Federal 6.75 4.25
338 Win. Mag. 230 Winchester 5.25
338 Win. Mag. 225 Federal 5.25 0.5
338 Win. Mag. 210 Federal 4 1
338 Win. Mag. 200 Federal 3.25 3.25
300 Win. Mag. 220 Winchester 6
300 Win. Mag. 200 Federal 3-3.5 3
300 Win. Mag. 190 Winchester 4
300 Win. Mag. 180 Winchester 4
300 Win. Mag.
(for A-Bolt II M1000 only) 180 Winchester 9
300 Win. Mag. 180 Federal 8.5 3
300 Win. Mag. 178 Remington 1
300 Win. Mag. 165 Hornady 1 1
300 Win. Mag.
(for A-Bolt II M1000 only) 165 Hornady 3
300 Win. Mag. 150 Winchester 9 9
300 Win. Mag.
(for A-Bolt II M1000 only) 150 Federal 1.5
300 Win. Mag. 140 1
300 Win. Mag. Fail Safe (Black Talon) 4
30-06 Springfield 220 Winchester 10-10.5 7
30-06 Springfield 180 Hornady 10 5.25
30-06 Springfield 180 Federal 5 5
30-06 Springfield 175 Federal 7.2
30-06 Springfield 165 Federal 2
30-06 Springfield 165 Winchester 2.5
30-06 Springfield 165 Hornady 3 3
30-06 Springfield 150 Hornady 3 2.25
30-06 Springfield 150 Federal 1.5 2
300 WSM 150gr. BST Winchester 1 0.5
300 WSM 180gr. PP Winchester 1 1
300 WSM 180gr. FS Winchester 3 10
308 Win. 200 3.25
308 Win. 180 Federal 5.25 5
308 Win. 168 Hornady 4 3.5
308 Win.
(for A-Bolt II Varmint only) 168 Hornady 4-4.25
308 Win. 150 Federal 2.5 2.5
308 Win.
(for A-Bolt II Varmint only 150 Federal 2.5
280 Rem. 165 Remington 6
280 Rem. 150 Federal 2.5
280 Rem. 140 Federal 4
7mm Rem. Mag. 180 Federal 5
7mm Rem. Mag. 175 8 5
7mm Rem. Mag. 168 Hornady 3
7mm Rem. Mag. 165 Federal 6-6.5 6
7mm Rem. Mag. 162 Hornady 5.75 5.75
7mm Rem. Mag. 160 Federal 5.75 3.5
7mm Rem. Mag. 160 Nos. Part 4 3.5
7mm Rem. Mag. 150 Federal 2-3 2
7mm Rem. Mag. 154 Hornady 1.3 3.5
7mm Rem. Mag. 140 2.5 1.5
7mm Rem. Mag. 139 Hornady 2.5 2.5
7mm Rem. Mag. 120 Hornady 1 1
7mm WSM 140gr. BST Winchester 1.25 6.5
7mm WSM 150gr. PP Winchester 4 0.5
7mm WSM 160gr. FS Winchester .5 0.0
7mm-08 Rem. 140 2.0
7mm-08 Rem. 120 1.0
7mm-08 Rem. 130 1.8
270 Win. 150 Federal 6 4
270 Win. 140 Remington 3-3.5 3
270 Win. 130 Federal 2.5 2
270 Win. 100 Remington 1 0
270 WSM 130gr. BST Winchester 1.25 2
270 WSM 140gr. FS Winchester 2 7
270 WSM 150gr. PP Winchester .3 6
260 Rem. 140 .5
260 Rem. 120 2
25 WSSM 85gr. BST Winchester 1
25 WSSM 115gr. BST Winchester 1
25 WSSM 120gr. PEP Winchester 0
25-06 Rem. 122 6
25-06 Rem. 117 Federal 6
25-06 Rem. 100 Hornady 3.5
25-06 Rem. 90 Winchester 2.25
25-06 Rem. 85 B Tip. 2.6
243 WSSM
55 gr. BST Winchester .5
243 WSSM 95 gr. BST Winchester 1.5
243 WSSM 100 gr. PP Winchester 6.3
243 Win. 100 Winchester 5 2.5
243 Win. 80 Federal 3 2.25
243 Win. 85
223 WSSM 55 Gr. BST Winchester 8
223 WSSM 55 Gr. PSP Winchester 10
223 WSSM 64 Gr. PP Winchester 9.5
.223 Rem. 55 Federal 7
223 Rem. 53 Federal 6.5
223 Rem.
(for A-Bolt II Varmint only) 40 Winchester 4
223 Rem. 40 Winchester 4
22-250 Rem. 55 5.5
22-250 Rem. 52 Winchester 4
22-250 Rem.
(for A-Bolt II Varmint only) 52 Winchester 5
22-250 Rem.
(for A-Bolt II Varmint only) 40 Federal 4
22-250 Rem. 40 Federal 2.5
You'll have to tweek a bit but it shouldn't be too far off.
This chart can be found on the Browning site under the Faqs tab.
Q. I have a Browning rifle with the BOSS. What is the "Sweet Spot" setting for my firearm?
A. The following are suggested "Sweet Spot" settings for Browning rifles that have the optional BOSS (Ballistic Optimizing Shooting System) attachment:
--------------------------------------------------------------------------------
Suggested "Sweet Spots"
Caliber Bullet Weight Ammo Manufacturer A-Bolt
Average
Sweet Spot* BAR
Average
Sweet Spot
375 H&H 270 2.3
375 H&H 300 4.5
338 Win. Mag. 250 Federal 6.75 4.25
338 Win. Mag. 230 Winchester 5.25
338 Win. Mag. 225 Federal 5.25 0.5
338 Win. Mag. 210 Federal 4 1
338 Win. Mag. 200 Federal 3.25 3.25
300 Win. Mag. 220 Winchester 6
300 Win. Mag. 200 Federal 3-3.5 3
300 Win. Mag. 190 Winchester 4
300 Win. Mag. 180 Winchester 4
300 Win. Mag.
(for A-Bolt II M1000 only) 180 Winchester 9
300 Win. Mag. 180 Federal 8.5 3
300 Win. Mag. 178 Remington 1
300 Win. Mag. 165 Hornady 1 1
300 Win. Mag.
(for A-Bolt II M1000 only) 165 Hornady 3
300 Win. Mag. 150 Winchester 9 9
300 Win. Mag.
(for A-Bolt II M1000 only) 150 Federal 1.5
300 Win. Mag. 140 1
300 Win. Mag. Fail Safe (Black Talon) 4
30-06 Springfield 220 Winchester 10-10.5 7
30-06 Springfield 180 Hornady 10 5.25
30-06 Springfield 180 Federal 5 5
30-06 Springfield 175 Federal 7.2
30-06 Springfield 165 Federal 2
30-06 Springfield 165 Winchester 2.5
30-06 Springfield 165 Hornady 3 3
30-06 Springfield 150 Hornady 3 2.25
30-06 Springfield 150 Federal 1.5 2
300 WSM 150gr. BST Winchester 1 0.5
300 WSM 180gr. PP Winchester 1 1
300 WSM 180gr. FS Winchester 3 10
308 Win. 200 3.25
308 Win. 180 Federal 5.25 5
308 Win. 168 Hornady 4 3.5
308 Win.
(for A-Bolt II Varmint only) 168 Hornady 4-4.25
308 Win. 150 Federal 2.5 2.5
308 Win.
(for A-Bolt II Varmint only 150 Federal 2.5
280 Rem. 165 Remington 6
280 Rem. 150 Federal 2.5
280 Rem. 140 Federal 4
7mm Rem. Mag. 180 Federal 5
7mm Rem. Mag. 175 8 5
7mm Rem. Mag. 168 Hornady 3
7mm Rem. Mag. 165 Federal 6-6.5 6
7mm Rem. Mag. 162 Hornady 5.75 5.75
7mm Rem. Mag. 160 Federal 5.75 3.5
7mm Rem. Mag. 160 Nos. Part 4 3.5
7mm Rem. Mag. 150 Federal 2-3 2
7mm Rem. Mag. 154 Hornady 1.3 3.5
7mm Rem. Mag. 140 2.5 1.5
7mm Rem. Mag. 139 Hornady 2.5 2.5
7mm Rem. Mag. 120 Hornady 1 1
7mm WSM 140gr. BST Winchester 1.25 6.5
7mm WSM 150gr. PP Winchester 4 0.5
7mm WSM 160gr. FS Winchester .5 0.0
7mm-08 Rem. 140 2.0
7mm-08 Rem. 120 1.0
7mm-08 Rem. 130 1.8
270 Win. 150 Federal 6 4
270 Win. 140 Remington 3-3.5 3
270 Win. 130 Federal 2.5 2
270 Win. 100 Remington 1 0
270 WSM 130gr. BST Winchester 1.25 2
270 WSM 140gr. FS Winchester 2 7
270 WSM 150gr. PP Winchester .3 6
260 Rem. 140 .5
260 Rem. 120 2
25 WSSM 85gr. BST Winchester 1
25 WSSM 115gr. BST Winchester 1
25 WSSM 120gr. PEP Winchester 0
25-06 Rem. 122 6
25-06 Rem. 117 Federal 6
25-06 Rem. 100 Hornady 3.5
25-06 Rem. 90 Winchester 2.25
25-06 Rem. 85 B Tip. 2.6
243 WSSM
55 gr. BST Winchester .5
243 WSSM 95 gr. BST Winchester 1.5
243 WSSM 100 gr. PP Winchester 6.3
243 Win. 100 Winchester 5 2.5
243 Win. 80 Federal 3 2.25
243 Win. 85
223 WSSM 55 Gr. BST Winchester 8
223 WSSM 55 Gr. PSP Winchester 10
223 WSSM 64 Gr. PP Winchester 9.5
.223 Rem. 55 Federal 7
223 Rem. 53 Federal 6.5
223 Rem.
(for A-Bolt II Varmint only) 40 Winchester 4
223 Rem. 40 Winchester 4
22-250 Rem. 55 5.5
22-250 Rem. 52 Winchester 4
22-250 Rem.
(for A-Bolt II Varmint only) 52 Winchester 5
22-250 Rem.
(for A-Bolt II Varmint only) 40 Federal 4
22-250 Rem. 40 Federal 2.5
You'll have to tweek a bit but it shouldn't be too far off.
