It is such amazing time, when we can get such high quality, well presented information for free. Excellent work with all of your high quality content.
@markandsamafterwork
2 жыл бұрын
Cheers Mika
@SmokedChen
2 жыл бұрын
Been learning heaps from you Mark and Sam, thank you so much!
@markandsamafterwork
2 жыл бұрын
Thanks Man, cheers
@vernongandy9026
2 жыл бұрын
I want to thank you folks for the educational experience. When I watch your videos I feel enlightened and not confused. Keep it going...
@markandsamafterwork
2 жыл бұрын
Thanks Vernon
@bornodnoc1034
2 жыл бұрын
I"m really happy to se your blogs get so many views so quickly. Almost at the 100K
@markandsamafterwork
2 жыл бұрын
Thanks Bor, yes getting there, Cheers man.
@oldschooljack3479
2 жыл бұрын
Thanks Mark.
@markandsamafterwork
2 жыл бұрын
Cheers
@colinreid7305
2 жыл бұрын
You make extending one knowledge easy to understand and very entertaining
@markandsamafterwork
2 жыл бұрын
Thanks Colin, Cheers
@joe74ta1
2 жыл бұрын
Thanks Mark you always do a good job of explaining a topic👍
@markandsamafterwork
2 жыл бұрын
Thanks Joe
@Sanya_na_ohote
2 жыл бұрын
Thank you very much for the video material, sorry Russian subtitles don't work...I'll review it again with a translator 🤝👍👍👍
@markandsamafterwork
2 жыл бұрын
Thanks Man, Cheers
@Allen338LM
2 жыл бұрын
honestly that's probably the best explanation of it I've ever heard
@markandsamafterwork
2 жыл бұрын
Thanks Allen, Cheers
@beestoe993
2 жыл бұрын
I have taken up bullet swaging and Ive been gleaning information about this sort of thing where I can. Interesting point about making the crown match the bullet style, I've never really considered that. A couple points worth mentioning is that any boat tail design (depending on other bullet specifics) may not show any benefit at all over a flat base for as far as 500-600 yards. And also you touched on this a bit, but the use of a flat base bullet can actually reduce throat erosion in chamberings that are known to be "barrel burners". I used to be of the mindset that a boat tail is simply better, but since taking up swaging Ive learned that for many shorter range scenarios a flat base actually has many pluses over a boat tail. Thanks for the video, very informative.
@markandsamafterwork
2 жыл бұрын
Cheers
@briancullen5183
2 жыл бұрын
Very interesting subject. Never really thought about energy loss? by using boat tail vs flat base bullet. But your explanation clearly shows how that could happen. Thanks again sir
@markandsamafterwork
2 жыл бұрын
Thanks Brian
@michaelreed1380
2 жыл бұрын
Lots of science, great info. Cheers!
@markandsamafterwork
2 жыл бұрын
Thanks Mike
@Leverguns50
2 жыл бұрын
I enjoy learning some new information about bullet ballistics
@markandsamafterwork
2 жыл бұрын
Cheers man
@kubikariYOU
2 жыл бұрын
Thanks for sharing your insite.
@markandsamafterwork
2 жыл бұрын
Cheers
@collinmckamy8076
2 жыл бұрын
always excellent info. thank you
@markandsamafterwork
2 жыл бұрын
Cheers
@westtexas3041
2 жыл бұрын
Thank you for the great information.
@markandsamafterwork
2 жыл бұрын
cheers West, thanks
@gruntardo7519
2 жыл бұрын
Great video Mark, very informative 👍
@markandsamafterwork
2 жыл бұрын
thanks Man
@prjndigo
2 жыл бұрын
base expansion is like the Diablo form used in pellets in airguns. You can often get better performance with them if you spread the base before loading since they're made of soft lead and get dented in. This pressure seal is what the shot-cups are for in shotguns. Interesting to note that just about all .22lr have a cup-tail that both holds the bullet in the casing AND expands on pressure.
@markandsamafterwork
2 жыл бұрын
Thanks Man, cheers
@terrybagatella3898
2 жыл бұрын
Love your stuff Mark. Very informative as usual.
@markandsamafterwork
2 жыл бұрын
Thanks Man, Cheers
@bigsmoke6189
2 жыл бұрын
I had a 308 Norma magnum that would shoot flat bases bullets more accurately than boat tails ,after checking the bore with air gauges it had tight and loose spots in the bore ,changing to Lapua step boat tails brought the accuracy back with the better trajectory at longer range.the bore variations were minute .
@markandsamafterwork
2 жыл бұрын
As mentioned, probably about the crown rather than the bore, Cheers
@neckstumping
2 жыл бұрын
Great stuff again. Cheers.
@markandsamafterwork
2 жыл бұрын
Cheers Man
@mrmayhemstewart5138
2 жыл бұрын
Every time you put up a vid I learn something thanks mate take care and stay safe both of you cheers Yogi 🤙🤙
@markandsamafterwork
2 жыл бұрын
Awesome, thanks Yogi, Cheers
@mhannan6328
2 жыл бұрын
Terrific explanation. Great graphics. I really appreciate your work.
@markandsamafterwork
2 жыл бұрын
Thank you, cheers
@walterluiz4694
2 жыл бұрын
Very intersting. Thanks
@markandsamafterwork
2 жыл бұрын
Cheers Walter
@ShakazuluJones
2 жыл бұрын
Great information, thanks.
@markandsamafterwork
2 жыл бұрын
Thanks Mark
@davidhandyman7571
2 жыл бұрын
Thanks Mark. Another interesting presentation.
@markandsamafterwork
2 жыл бұрын
Cheers Dave
@markandmellwhiteley7995
2 жыл бұрын
a keep it simple stupid very understandable explanation Mark thankyou
@markandsamafterwork
2 жыл бұрын
Thanks folks
@warbirdflyerF4U
2 жыл бұрын
Very interesting video mark I had never actually heard of a rebate boattail bullet I do see the logic behind it but I also don't see a need for it If a gun is set up and maintained properly Thanks for all your great videos hope you and Sam are having a wonderful summer
@markandsamafterwork
2 жыл бұрын
Thanks Matt, and winter here, lol, glad you liked, Cheers
@tiputipu777
2 жыл бұрын
The rebated boat tail is the lapua d46. Scenars are normal boat tails.
@markandsamafterwork
2 жыл бұрын
Cheers
@hobbyhermit66
Жыл бұрын
Interesting article. It seems to me that the flat based bullets would offer longer barrel life over the boat tails, due to the flat base creating a better gas seal.
@markandsamafterwork
Жыл бұрын
Cheers
@georgb2215
2 жыл бұрын
Very good in depth explanation as always 👍
@markandsamafterwork
2 жыл бұрын
Thanks George
@highdesertdrew1844
2 жыл бұрын
Mark, Good stuff. I had been seeing some stuff from Rex and a few other ELR people about RBT bullets lately. I remember... however many years ago Corbin was talking up the benefits of RBT bullets, at the time it seemed more like something he was pushing as it was what his tooling was capable of making. Given the amount of experience I've had since then, and lack of anyone else really doing anything with it, I wasn't super convinced to even revisit the idea until recently. After seeing your video, I'm still not sure it's an idea worth revisiting. Maybe when I get some more time. It's interesting recounting the changes we've gone through as far as hunting crowns, to target crowns, to muzzle brakes, to suppressors (at least here in the states, as well as scandinavia). Brakes and suppressors have really made a massive difference both in terms of recoil, and accuracy for so many calibers, I use them even in places that seem silly. Putting a brake on my .22LR does nothing for recoil,, but makes a massive difference i group size.
@markandsamafterwork
2 жыл бұрын
Thanks Drew, glad you liked, Cheers
@rvrski1
2 жыл бұрын
I agree with all you’ve said, I’ve always viewed rebated BT’s as a potential bandaid to a hardware issue. I also question manufacturing consistency when another shape process is introduced. In an age when we’re using added and accurised processes in hand loading to reduce tolerance variation round to round I’m wary of potential inconsistencies in all consumables.
@markandsamafterwork
2 жыл бұрын
Cheers Tony, thanks
@cottespatrice8847
2 жыл бұрын
Great Information about RBT bullets. I Just bought corbins swaging tools and I will soon use rebated boat dies to produce some bullets in 6 mm caliber. I'll let you know How things work. Regards Patrice
@markandsamafterwork
2 жыл бұрын
Awesome, Cheers
@Tikka300-
2 жыл бұрын
Great presentation as always Mate 👍
@markandsamafterwork
2 жыл бұрын
Cheers man. thanks
@cheifbrownrabbit3986
2 жыл бұрын
Hope you and sam are doing well, thank you for the content
@markandsamafterwork
2 жыл бұрын
Cheers Man, thanks
@HebrewHammerArmsCo
2 жыл бұрын
I can assure you , It's allot easier to swage a RBT than a BT... And it's easier to make the swage dies as well
@markandsamafterwork
2 жыл бұрын
Yes I gather, Thanks Adam, Cheers
@johanlindh737
2 жыл бұрын
As always, excellent!
@markandsamafterwork
2 жыл бұрын
Thanks
@duggydo
2 жыл бұрын
I’ve never used them. Any issues with catching on case mouth during seating? Good info. 👍🏻
@markandsamafterwork
2 жыл бұрын
same as flat base, Cheers
@shanerorko8076
2 жыл бұрын
well I learnt something. I would guess driving bands are good when you're chasing muzzle velocity.
@markandsamafterwork
2 жыл бұрын
Cheers
@johnh4957
2 жыл бұрын
Where practice trumps theory (evidence based is the current go word)
@markandsamafterwork
2 жыл бұрын
Lol, Cheers
@johngoodwin2768
Жыл бұрын
Hi Mark, Thank you for the always informative videos. You mentioned David Tubb. What do you think of the ring that he puts on the tip of a bullet? He claims that it pushes up the BC?
@markandsamafterwork
Жыл бұрын
Not what he said, he found it give a more consistent but lower bc on his projectiles.... Cheers
@lonniefransen2946
2 жыл бұрын
How does a muzzle break change the gas coming behind the bullet?
@markandsamafterwork
2 жыл бұрын
We have videos on that, Cheers
@brentfrank7012
2 жыл бұрын
Mark has anyone experimented with dimpling a bullet, like a golf ball to lower drag?
@highdesertdrew1844
2 жыл бұрын
Doesn't work. Remember, bullets spin at about half a million RPM, and travel well past the speed of sound. I have no doubt golfballs acquire quite a spin, just much less than a bullet, and don't travel at supersonic velocities for very long. Because of the rotational speed, dimpling doesn't work, but sometimes having rotated features that mimic dimpling can have an effect. Usually you see this in hypercavitation based projectiles, which is a whole different topic.
@markandsamafterwork
2 жыл бұрын
60000rpm to 300000rpm
@michaelogden5093
2 жыл бұрын
Your illustrations along with the explanations aid immensely in understanding. Thanks.
@markandsamafterwork
2 жыл бұрын
Thanks Mike, Cheers
@borisj4054
2 жыл бұрын
You need NASA to put those bullets into a super sonic wind tunnel to see what the flow and local pressures are.
@markandsamafterwork
2 жыл бұрын
Lol, Cheers
@gnsmk357
2 жыл бұрын
Got it. Good insight from a guy who is not just behind a desk or in some lab. Great Video.
@markandsamafterwork
2 жыл бұрын
Thanks
@machinist7230
2 жыл бұрын
Corbin Bullet swaging is a big proponent of rebated boattail bullets.
@markandsamafterwork
2 жыл бұрын
Yep, thanks Man, Cheers
@huntarama9375
2 жыл бұрын
crazy as it sounds i use rebated boat tails in my double rifle . They seem to be quite slippery and I get the same velocity from a 168grn rebated boatail as I do from 150 grn fb
@markandsamafterwork
2 жыл бұрын
Cheers
@chrischiampo7647
2 жыл бұрын
What If The Rebated Boattail Was Machined In Step Down Fashion Then There Would Be Multiple Flat Edges To Push Equal Down The Barrel But As It’s Stepped Down It Would Behave Even More Like The Boattail In Flight Since There Are Several Smaller Square Edges To Produce Less Drag Instead Of One ?? Mark 😀 Great Video and Subject
@markandsamafterwork
2 жыл бұрын
All explained in the end of the video, thanks Chris, Cheers
@ForceRecon112
Жыл бұрын
Given your years of shooting and videos here on youtube, I'm sure you've experimented with the DTAC bullets. What is your experience with those?
@markandsamafterwork
Жыл бұрын
They are a decent bullet, Cheers
@zeph-8244
2 жыл бұрын
The LAPUA D-46 185 gr .30 caliber bullet is rebated and still holds competition world records from the 1930's
@markandsamafterwork
2 жыл бұрын
Cheers
@fisherus
2 жыл бұрын
Mark, it appears to me that Lapua was trying to imitate the original. 408 CheyTac bullet. Your thoughts?
@markandsamafterwork
2 жыл бұрын
We have used and like the later Cheytac 350grn 375cal, but not seen the early designs, Cheers
@islamdo
2 жыл бұрын
Interesting , there is always a trade off In any bullet shape Very informative video thx 🙏
@markandsamafterwork
2 жыл бұрын
Cheers Islamdo
@tommysaulter9171
2 жыл бұрын
Mark... I’m really glad you covered this subject because the only explanation for the rebated boat-tail bullet was supplied by the manufacturer (Alco)... They are showing great results at 1k yards. .308 175gr .707 (G1) BC driven at 3050fps out of my 300WSM...! Thank you for your technical info...!!!
@markandsamafterwork
2 жыл бұрын
Thanks Tommy
@stevegimenez9981
2 жыл бұрын
Very good video. You're a good teacher I just learned something About Bullets I do a lot of reloading.
@markandsamafterwork
2 жыл бұрын
Thanks Steve, Cheers
@mater3709
2 жыл бұрын
I don't shoot long range and know it's not the norm for jacketed bullets but have you thought about or tried a gas seal on a boat tail? Maybe a bullet shaped like a football with a gas seal? Would that help with the "problem " of pushing the bullet or the point where bullet leaves the crown? Anyway just some thoughts love the vid as always and appreciate what you take the time to tell us about things!
@markandsamafterwork
2 жыл бұрын
Thanks Mater, and well, all explained in the video, but no that wouldn't help, lol, Cheers
@artandrew21
2 жыл бұрын
Love your videos mate, keep them up.
@markandsamafterwork
2 жыл бұрын
Thanks Andrew
@JohnRoberts71
2 жыл бұрын
Great content thanks for sharing
@markandsamafterwork
2 жыл бұрын
Cheers
@ronboff3461
2 жыл бұрын
thanks dude!
@markandsamafterwork
2 жыл бұрын
Cheers
@thomasdaum1927
2 жыл бұрын
Thanks !
@markandsamafterwork
2 жыл бұрын
Cheers
@ATINKERER
Жыл бұрын
I've been in the shooting sports, and a student of guns and ammo, for over 50 years. Yet, I've learned so much from you!
@markandsamafterwork
Жыл бұрын
Awesome, Cheers
@kenpickett9317
2 жыл бұрын
RWS used to make their TIG and TUG bullet designs that had full 90 degree cone shaped bases that terminated in a sharp point.
@markandsamafterwork
2 жыл бұрын
Thanks Ken, Cheers
@jonathandotson5880
2 жыл бұрын
How the hell do they not have millions of views? Extremely great content coming from this channel. Was just introduced to it today.
@markandsamafterwork
2 жыл бұрын
Thanks Jonathan, Cheers
@robjohnson6747
2 жыл бұрын
You never cease to amaze me ! You take complicated answers or reasons and simplify them so much and put them in simple layman’s terms even I understand ! You have an incredible gift for that and you should have at least one million followers/subscribers because no one does it as well as you ! THANK YOU !!!
@markandsamafterwork
2 жыл бұрын
Your welcome, glad you liked, Cheers
@TerryGilsenan
2 жыл бұрын
mate, your videos are fantastic. I love the engineering content, and the discussions of the reason why X does what it does.
@markandsamafterwork
2 жыл бұрын
Thanks Terry, Cheers
@richc767
2 жыл бұрын
Great information as always. Your views are very well thought out!
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