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  1. J

    runout....where to measure?

    Re: runout....where to measure? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gfunkUK</div><div class="ubbcode-body">hey chaps, in regards to bullet runout, where is the best place to measure? at the ogive? or i think i read somewhere it should be close to the...
  2. J

    Gunsmithing Factors that affect the LR 308

    Re: Factors that affect the LR 308 A minimal gap means nothing. The question is. Is there is movement between the upper and lower <span style="font-weight: bold">DURING</span> the time the bullet is traveling down the barrel? Front to back? Up and down? Side to side? (Tight pins) John
  3. J

    Rifle Scopes Nightforce Unimount

    Re: Nightforce Unimount <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gonfst</div><div class="ubbcode-body"> Will there be any potential negatives to having a 20 M.O.A base under the 20 M.O.A Unimount? Thanks. </div></div> Yes. 20MOA + 20MOA = 40MOA Unless you...
  4. J

    Rifle Scopes Coating Aluminum Rings after lapping?

    Re: Coating Aluminum Rings after lapping? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: USMCj</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: John F</div><div class="ubbcode-body">If the lapping process...
  5. J

    Rifle Scopes Coating Aluminum Rings after lapping?

    Re: Coating Aluminum Rings after lapping? If the lapping process removes enough plating to expose the bare aluminum I'd chuck the rings and go by some new ones. A little oil on the bare aluminum should prevent contact with air on an installed set of rings. The aluminum black works too. John
  6. J

    Rifle Scopes Verifying Scope Leveling Q???

    Re: Verifying Scope Leveling Q??? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Grump</div><div class="ubbcode-body">Yeah, I read everything, but... IF the group at the longer-distance zero elevation is off to the right by 3/4-inch at 100 yards, compared to the...
  7. J

    Sniper's Hide - Rifles Only DATA BOOKS

    Re: Sniper's Hide - Rifles Only DATA BOOKS How about subdued green paper? John
  8. J

    Gunsmithing Optimum barrel lenght

    Re: Optimum barrel lenght Hi, The optimum barrel length is directly tied to the time the bullet takes to exit the barrel. There are nodes or velocity vs time sweet spots. See the article by Christopher Long here. OBT Some great software and research here. RSI It may be a bit much but I...
  9. J

    Advanced Marksmanship New Guy Question RE: Tools for Range Estimation

    Re: New Guy Question RE: Tools for Range Estimation Jack, The Leupold Duplex has a range estimation ability built in. Download an owners manual from Leupold. It's not as accurate as mildot but it's better than nothing. John
  10. J

    Gunsmithing Building an accurate AR...

    Re: Building an accurate AR... Yes. Remove the muzzle brake, sight, hand guards. Slide the barrel into the upper muzzle first. Put some dykum on the face of the upper and then rotate the barrel extension against the face. If you remove most of the dykum it's square. John
  11. J

    Cupronickel, that is not a typo.

    Re: Cupronickel, that is not a typo. From the wiki article. "Beginning around the turn of the 20th century, bullet jackets were commonly made from this material. It was soon replaced with gilding metal to reduce metal fouling in the bore." John
  12. J

    Rifle Scopes flip up caps and "kill flash" for spotting scops ?

    Re: flip up caps and "kill flash" for spotting scops ? Butler Creek makes a 60mm cap. Leuopld makes both for their MK4 spotter. Should fit the other Leupold's. Both the caps & ARD are available from MidwayUSA. And eBay. John
  13. J

    B&C stock accessories / possible seekin's help?

    Re: B&C stock accessories / possible seekin's help? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: frollo</div><div class="ubbcode-body">I have a B&C A5 stock which has an internal 3/8" rail. I am looking for accessories for the rail. I would really like to...
  14. J

    Fieldcraft Homemade Red Lens

    Re: Homemade Red Lens They have made red filters for b&w photography for ages. They inexpensive and come in buckets of different sizes. What is the diameter of the lens element in your light? The filter rings come right apart. eBay John
  15. J

    Gunsmithing anone use 6al/4v titanium for custom action

    Re: anone use 6al/4v titanium for custom action Titanium is not that hard. Try inconel or invar for some real fun. You need the right tooling, speeds & feeds, but most of all the right coolant. Tap with the wrong stuff and you've screw the pooch. It really does like to work harden. Even...
  16. J

    Check out my new Target AR15!!!

    Re: Check out my new Target AR15!!! Great! Now that the AR is done. Take that poor tired Weber Kettle Grill down to the VFW so it can be ceremoniously & respectfully destroyed. Spring is 3 weeks away!!! John
  17. J

    Rifle Scopes How realistic is this?

    Re: How realistic is this? The direct neural interface is another $25,000,000.00 John
  18. J

    Rifle Scopes What model Leupold?

    Re: What model Leupold? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mrmojo</div><div class="ubbcode-body">I just bought a rifle with a leupold scope on it. Wanted some help to identify it. It says VX III 3.5-10x50 Tactical. Has target knobs, black ring on...
  19. J

    Gunsmithing whats the deal with scope base screws?

    Re: whats the deal with scope base screws? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: AXEMAN</div><div class="ubbcode-body">well im all better now. i just got back from my neighbors. he used a 2.5mm key that he tapped down into the head with a light mallet...
  20. J

    Rifle Scopes M 24 scope case?

    Re: M 24 scope case? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: fried squirrel</div><div class="ubbcode-body">The NSN for the Day Optic Sight Case is 1005-01-260-2666 if you have the capability to order the case through the supply system. Another option is...
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