.300 Boss


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chprblst
May 21, 2003, 03:33 PM
I recently bought a .300 Winchester Model 70 with the Boss system. Winchester stopped testing when they passed it on to Browning. They only list the "sweet spot" settings for 180 & 200gr. Has anyone found the sweet spot for 165gr's? I would hate to spend five boxes to find it, and I dont shoot well enough to be able to rule out human error. Thanks

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MLC
May 21, 2003, 09:39 PM
Browning BOSS website (http://www.browning.com/faq/detail.asp?ID=109) may help, since it is a model 70 it may not.

larryw
May 21, 2003, 10:59 PM
I've found the published guidelines on the BOSS to be of minimal benefit. I've also found there is no rhyme nor reason to the results, a .25 difference in setting can lead to a 1" difference in groups.

In my 30-06 Stalker, I ran through the variations I found a good setting for my gun. Now I have a light barreled hunter that shoots like a target rifle: the BOSS works, but you have to spend time at the bench figuring it out.

Go to the range, set up some sandbags or a rest on a bench to minimize human error (ask for help if you haven't done this), and shoot your gun. Three rounds into a target at a specific setting, let the barrel cool, change the setting .25 and three more at a different target. Repeat. Once you find a setting that shoots well (say, three shots under 1" at 100 yards), confirm by shooting several groups. Shoot it cold, warm, clean, dirty. Point of Impact (POI) should be consistent. Make sure cold shot hits where you want it as the cold shot is the money shot.

Make sure the BOSS is tight, it its loose, you'll get funky results. Also, the ported and non-ported weights will give you different results. As the ported one is LOUD and probably not the one you'll use in the field, use the standard. A rolled up towel between the stock and shoulder will help you get used to the recoil so you don't develop a flinch.

I strongly doubt the Browning site would be of any use as the barrel specs, composition and resulting harmonics are different for your gun.

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