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NEED HELP BROWNING BT-99 Guys

Discussion in 'Shooting Related Threads' started by copperhead, May 29, 2011.

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  1. copperhead

    copperhead Member

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    I purchased a Browning bt-99 and it has a single star marked on the barrel so I thought it was full. After I got home from my first round of trap with it I measured the choke diameter and got .708. My question is "what is the standard bore diameter for the bt-99"? so I can figure out what the constriction is and if the fixed full choke was opened up.
     
  2. grunt

    grunt TS Supporters TS Supporters

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    Only a bore gage will let you know for sure. Some barrels years ago had the bore stamped on the bottom of the barrel.
     
  3. Oregunner

    Oregunner Well-Known Member

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    You could put it on paper and see what it looks like. (see link) I have an older BT-99 that has a .726 bore. If yours is close to that, it sounds like yours might be a loose mod. Or, maybe the barrel has been bored out and is still a full choke with an overbore. You really need a bore gauge or need to pattern it to see. Or you could just shoot it and not worry about it. Put some shot on the target and it breaks.We have a guy that shoots games at our club and does really well. He was telling me that he shoots an IC choke all the way back. I didn't believe him, but after he let me unscrew the choke, it was an IC. Can't argue with success.
     
  4. trapshooterjoe7

    trapshooterjoe7 Member

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    The bore could be .725 to .735 and it may have been back bored to .745, only the bore gauge will tell.
     
  5. coveybuster

    coveybuster Member

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    Trapshooter Joe is right. My '69 measures .725 and my '70 measures .730.
     
  6. copperhead

    copperhead Member

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    According to the ser.# it was manufactured in 87 if that helps.
     
  7. Oregunner

    Oregunner Well-Known Member

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    According to my Blue Book of Gun Values, Invector chokes became standard on BT-99s in 1986. Sounds like you have an unusual gun, maybe it has had a different barrel fitted?
     
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