Perazzi TM1 bbl question

Discussion in 'Trapshooting Forum - Americantrapshooter.com' started by Racerx, Apr 29, 2019.

  1. Racerx

    Racerx Well-Known Member

    What is the normal factory backbore on a early Tm1? I mic it and it reads around 738.. and restriction is 687 = 51(extra FULL) .. does this sound right?? I do have a older mic.. its not perfect sooooo that's why im asking?? has a star 18.5 on bbl and G1.480 also accials special if that means anything???
     
  2. oleolliedawg

    oleolliedawg Mega Poster Founding Member

    Looks like someone decided to backbore this one without relieving some choke. As I recall early TM-1's usually came in around .725 meaning around .038 choke. Somethings not right here including your measurements.
     
    wpt likes this.
  3. Racerx

    Racerx Well-Known Member

    I appreciate your info !! what I should do is have it mic by someone else.. but I bet your right.. most likely was opened up... might just turn it.. its a release.. don't do release triggers.
     
  4. trapshooter47

    trapshooter47 US Army Retired US Army Retired Founding Member

    I've got a Pull trigger I might trade for your release
     
  5. Semperfi909

    Semperfi909 Mega Poster

    The TM1's I've mic'd were all 0.728 and remarkably consistent. The factory full (*) usually came in at 0.040"-0.041"
    FWIW but like I say that's just what I've seen
     
    wpt likes this.
  6. jansonuhl

    jansonuhl jansonuhl

    I have 2 very old ones that are both .727.
     
  7. Racerx

    Racerx Well-Known Member

    Thank you for the information !
     
  8. John G.

    John G. Active Member

    The barrels should be stamped 18..3 , 18.4 or 18.5 .The Tm1 spl. I just measured is a 18.3 =.722 bore with a ,042 choke in it.
    Perazzi also stamped the weight of the barrels on them also.
     
    wpt and just joe like this.
  9. dr.longshot

    dr.longshot Grudge Match Champion Founding Member Forum Leader Grudge Match Champion

    My TM-1 had .042 full choke with a .724 Bore the choke was .682 extra full choke, extremely tight

    GB..................................DLS
     
  10. Racerx

    Racerx Well-Known Member

    thank you
     
  11. ljutic329

    ljutic329 Mega Poster Founding Member

    Mine was the same Dr.
     
  12. dr.longshot

    dr.longshot Grudge Match Champion Founding Member Forum Leader Grudge Match Champion

    I had a total of 3 TM-1s all were extra full, Remember Perazzi used #8 shot on patterning their Guns they used to enclose a pattern w/their new guns and it stated #8s were used printed on the Pattern Sheet.

    GB........................................DLS