Ultimate Benchrest Rig - Defiance Deviant Tactical - Bartlein M24 Barrel - in 6.5-284 Norma Part 3
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- Опубликовано: 20 окт 2024
- Hang out with Master Riflesmith Geoff Montgomery as he machines a Bartlein M24 Barrel for a brand new Defiance Deviant Tac·ti·cal Bolt Action. Chambering the barrel for the great 6.5-284 Norma cartridge!
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Awesome. Just want to share some expirence regarding how your holding your barrel in a 4 jaw chuck.
I would suggest you keep the jaws behind your chamber. Especially at the lead / freebore area. It doesn't take much force in clamping of those jaws to affect ID of the bore and from expirence chambering, will cut more than the reamer dimensions. This is why I personally use a copper ring, not only to create a pivot point, but mitigate this issue
thank you for watching and for the suggestions! FWIW - I do use brass shims between the jaws/barrel. I guess it's just the machinist trained side of me thinking choking up on the barrel is best for rigidity, but you do have very valid points! Others have mentioned similar things. While I don't torque down super tight, ID deformation is a definite possibility and I'll take that into consideration moving forward! Always open to constructive suggestions/criticism. Thank you again!! (BTW - I love your channel!! Subscribed!)
I enjoy watching and learning.
Thanks for watching and for engaging the channel!
These vids are great, please keep them coming, this is something that I would love to learn, cheers Yogi ✌️
Nice work
Thanks for the visit
Looks good. Few things I noticed. Generally you want to take more than that off the muzzle end. Usually want take about 3/4 of an inch. That's why barrels come at least an inch longer than barrel finished length. The reason being is that where the lap exits the bore is distorted. Especially in hand lapped barrels where it's impossible to keep the lapping rod perfectly straight. Don't have to do it on the chamber side because you're cutting that part out when you drill/ream(although if you're getting your concentricity from the lands you need the indicator probe past this point). Most of the time you can actually watch a tenths indicator climb onto the lands and they will be shorter/uneven in the first part of each end. Also if that's a sized round from the customer then that head space is a bit tight. The bolt should fall free on a sized case(since you're generally bumping the shoulder back 0.001"-0,002). If that's a freshly fired case then it's probably fine but he should make sure he's sizing it back enough for the bolt to fall freely. The case should have room to grow into the chamber when fired. Especially the first time in a new chamber. Cheers.
@@MMBRM Try taking .750" off a Carbon Six or Proof barrel and then thread to 5/8-24 thread. Today's lapping by all "best" barrel makers does not require that dimensional take off unless you're trying to achieve a reduced barrel length.
@@johnseptien3138 Neither one of the scenarios you presented are taking place in this video. 0.750" just gives you some margin of safety. You can normally get away with 0.5". All the carbon barrels I've seen come with 2" or so of steel at the muzzle when you buy a blank. Which is plenty to cut off 0.5" and thread. You're wrong about most good barrels not requiring or recommending that you cut off that much from the muzzle. There's a reason that every steel barrel ships at least an inch longer than finished length when you order blanks. You think they wouldn't save every inch of steel they could to cut costs if it didn't matter?
Thank you very much for watching and for engaging the channel! Bartlein does say there is no need to cut off any additional length from the muzzle end of their barrels anymore. They've been manufacturing their barrels long, cutting off the buggered section, and shipping the final length. Still good to cut a fresh crown in any case. Others are following suit, but it is always wise to call and ask, as well as borescoping. I do explain that I borescoped this barrel (but did not get footage of it) and that the bore looked good, but I was cutting off the 1/4" or so just to be on the "safe" side. The rifle shoots "lights out" and has won some matches this season, so there's definitely no issue with this particular barrel. Very good advice none-the-less!
@@AccurateRiflesandRestorations Thanks for the reply. I have heard anecdotally that some manufacturers cut off the distorted section but haven't seen it myself. Do you know when Bartlein started doing this? I ask because the last three F-CLASS barrels I did were Bartlein and they all came in over a inch longer than their finished size. Including one I did less than a month ago(Although I don't know when they actually were made). I think I still have the cut off portions of them hanging around so I'll chuck them in the lathe to see if they still have the distortion in them. Often times you can't see it with a bore scope as the wear can be very minimal(lands can be up to 0.0005" shorter or less sometimes). You can always check this by using a tenths indicator probe inside the bore near the entrance to the muzzle measure the land and groove to get the height of each land and then compare to a spot further in(easier if it's dialed in concentric). Glad to hear that the barrel is a shooter! That's always very satisfying. My three bartleins just came first, second and third in a mid sized FTR championship. One shot 7 out of 10 matches clean while averaging over 50% X count. The conditions made for easy shooting but it still makes me proud! Mild conditions make the accuracy more important. I wish your videos had been around when I started out. They would have been a big help. I'm sure they can still teach me a thing or two. Take it easy.
Fascinating, how long does this process take for a barrel from one of the big manufacturers for an off the shelf rifle? Also, is that special oil in the bottle? Or just motor oil or something?
depends on the cartridge. Bigger/longer cartridges take more time due to more material being removed. It takes as long as it takes. No rush. The oil is Nu-clear mixed with a bit of Vipers Venom. Thanks for watching and for engaging the channel!
used the 6X284 in the 1990's guess we me missed it by .5mm however the yotes did not know.
it is a great underappreciated cartridge for sure!
R U going to shot it for accuracy? I hope so.
Me too
Video was shot and rifle was delivered way back in February. Since then, it has been winning matches and shoots very well from what I heard from the customer and a few others. New videos will have more accuracy proving in the future, I promise!
@@AccurateRiflesandRestorations Thank you I love to watch people testing accurate rifle.
How long does the process take start to finish?
depends on the cartridge. Bigger/longer cartridges take more time due to more material being removed. It takes as long as it takes. No rush. Thanks for watching and for engaging the channel!
Hunting rifle, Carbon wrapped or fluted steel barrel?
Carbon Fiber barrels can have some consistency issues. They look snazzy and are nice and light weight, but I would personally go with traditional steel.
@@AccurateRiflesandRestorations Thanks for the quick reply. I think you are correct. Love to watch your builds !
Snowing? Where are you?
This was filmed in Feb in Wyoming.
Keep in mind I've sat in a 4th of July parade in Afton in spitting snow and rain. Welcome to Wyoming!
03:46 Filmed Feb 14 2024
How’s this compared to using a prefit barrel in say a zermatt action as far as accuracy and cost? Thx
Thank you for watching and for the comments! For a basic barrel (SAAMI chamber, standard length, contour, no muzzle threads, plain barrel) with no other options it is slightly cheaper. These prefits are machined with looser tolerances in order for them to fit any/all actions, so depends on if you care about that, or want someone like me to properly fit the barrel to your specific action and be hands-on the entire time - rather than some CNC robot mass producing barrels for the masses. In theory, accuracy could suffer with a prefit due to this, but I have heard lots of people are happy with their robot-made prefit barrels. Also be aware that you need to invest in expensive gauges, vises, and wrenches to properly torque these barrels so they don't come loose and headspace is correct.