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  1. biffj

    Official (DTA) SRS, HTI, Covert, Hunter Thread

    I'm still running my Gen 1 purchased in 2010 and have yet to break or bend the alignment pin. I use the rifle for testing barrels made up for customers along with shooting my own oddities. I had a 33XC 32" which did quite well and my current 338 LM barrel is 30". I shot out the original 26" DT...
  2. biffj

    Gunsmithing MP5 clone questions/help

    HK pro has a lot of great info but the site can be a little snobby. Since your mp5 isn't really an HK some folks get weird. I got banned for saying that registered sear guns were not original MP5's but rather semi's converted to select fire. Some folks are a little sensitive, or were a few years...
  3. biffj

    Gunsmithing MP5 clone questions/help

    It does look like the welds on the right side are rubbing from your pics. Obviously we can't see the left side but chances are they're dragging too. With the spacer removed the tube can bend back to its resting position and you're likely clearing the welds a bit. If you can get a cartridge roll...
  4. biffj

    Gunsmithing MP5 clone questions/help

    it is quite possible to bend the tube and bind up the system. Maybe in your slap and shoot drills you dinged something. That is what you need to determine. You can use a sharpie or other marker to color the cocking piece. Put it back together and move it a few times, then look it over to see...
  5. biffj

    Gunsmithing MP5 clone questions/help

    You may have something jammed into the cocking tube that is dragging the cocking piece. Its not uncommon. You could also have a lot of goop gumming up the works and after sitting a few days it solidifies a bit and makes things tough to run. My bet is on crap in the cocking tube. It could even...
  6. biffj

    SUBSONIC 300 BlACKOUT 1:8 TWIST RATE

    Not sure what a grain is other than wheat or corn etc.....are you talking bullet weight? Silly semantics. The others are right. A 1-8 twist should stabilize up to about 240gr pointed boat tail bullets. If you're having trouble check the actual twist rate of your barrel. You'd be surprised how...
  7. biffj

    Maggie’s Motivational Pic Thread v2.0 - - New Rules - See Post #1

    Linda Vaughn used to be at the Speedway in Indy for the month of may when I was with a race team in the 90s. She would wander the pits and the garages and was a really nice lady. Frank
  8. biffj

    Maggie’s Motivational Pic Thread v2.0 - - New Rules - See Post #1

    One of the instructors at the school where I got my private pilots license was a Wasp who flew B17's to europe and other aircraft around the US. I did a stage check with her and was amazed at he knowledge and ability...I found out about her WWII flying just after that. Excellent pilot and they...
  9. biffj

    Maggie’s Motivational Pic Thread v2.0 - - New Rules - See Post #1

    That looks like the Albuquerque headed east on I 40. Used to see a lot of odd stuff back there.... Frank
  10. biffj

    Pulsar T3 Trionyx (2021 US Model only)

    I do understand what you're saying but in all the years I've been dealing with this stuff when someone says IR it normally means thermal. Has something changed recently? Frank
  11. biffj

    Pulsar T3 Trionyx (2021 US Model only)

    Not an expert in these sorts of things but isn't IR infrared or thermal? I thought night vision was NV with thermal being IR. Just clarifying. Might make it easier for the search in future. Frank
  12. biffj

    Maggie’s Motivational Pic Thread v2.0 - - New Rules - See Post #1

    Much better than a cartridge case full of powder..... Frank
  13. biffj

    7.5x55 Swiss Load Data and GRT

    I know this post is a bit old but you may find that Reloder 17 and 175gr TMK will give you an excellent clone for the GP11 round. You will need to seat the bullet a bit shorter than the overall length shown in manuals as the shape of the GP11 bullet is much different. I've been running about...
  14. biffj

    Official (DTA) SRS, HTI, Covert, Hunter Thread

    Yep, got you there. The gen 2 system is so much more solid and repeatable. Had to start somewhere though. I don't really haul my rifle anywhere but from the car to the bench normally so I don't get the same wear and tear you do. I never really thought about bending the pin either. Roll pins...
  15. biffj

    Official (DTA) SRS, HTI, Covert, Hunter Thread

    Why do you need gen 2 bolts? Any of them will work with either barrel extension. Doggie, You've popped 4 pins? I still haven't broken any. Original tiny roll pin from a 2010 rifle used for demos of the barrel change system and a variety of shoots. I have run a few of the gen 2 extensions and...
  16. biffj

    Official (DTA) SRS, HTI, Covert, Hunter Thread

    I've got a gen 1 SRS I bought in 2010 and I've run bolts made all the way up to last year. I'm pretty sure they're all compatible with all the rifles. I've yet to see one that doesn't lock up properly and headspace right. After making a lot of barrels over the years I've fitted a lot of gen 1...
  17. biffj

    The new 33XC & 37XC cartridges designed by David Tubb

    Yep, sounds like you're doing ok. Your mileage may vary but if you're getting that velocity out of your 338 without blowing things up you are the master. Frank (sorry, I don't ever do emojis but this is intended in a humorous way)
  18. biffj

    The new 33XC & 37XC cartridges designed by David Tubb

    I've run them out of my 338 too but I wasn't getting 3200 fps out of the 338. The faster the bullets go the faster they spin. Thats where the trouble comes in with jacketed stuff vs solids and fast twist barrels. Keep the velocity down and they won't come apart. Run them too fast and they may...
  19. biffj

    The new 33XC & 37XC cartridges designed by David Tubb

    Lots of guys like the Warners and I've had great results with the Cutting Edge stuff too. Good places to start at least. Frank
  20. biffj

    The new 33XC & 37XC cartridges designed by David Tubb

    8.5 twist is probably a little fast for the jacketed stuff if you're going to run them fast. Otherwise you should be fine. I never ran anything but solids through mine and had no issues but a customer saw a lot of grey puffs when he ran jacketed through his rifle. Not every bullet blew but a...
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