Neck Sizing vs. Bump Sizing vs. Full Length Sizing

- double - like a boss alright guys so I get a lot of questions about neck sizing versus full length sizing versus bumping the shoulder or you know basically bumping bump sizing now one thing to realize is there's different circumstances are going to dictate as to which type of sizing you're going to do so the purpose of this video is to briefly kind of describe what the difference between the three are and in which situation you might use one over the other so the first thing I want to cover is how we measure what kind of impact we're having on these cases so here I've got a fired seven millimeter Oh 8 and basically it's a 308 that's been next size down the seven millimeter the seven millimeter bullets have a better ballistic coefficient for their bullet selection then the 308 does so it's going to shoot flatter with the same amount of powder in the case because increase the velocity so I chose seven millimeter weight for that reason first thing I'm going to do since these are freshly shot they have formed to my chamber okay so they are basically sized or fire formed however you want to say it to my chamber of my gun so there's still a little dirty on the next so I'm just going to wipe off the neck real quick on all three of these and we're going to go ahead and measure the shoulder and this is called a headspace gauge kit it's made by Hornady that you know there's lots of different makes but in essence it's an insert okay that just measures similar to how we measure on the bullet compared to how we measure the ogive or measure to the ogive of the bullet with this you're measuring the shoulder of the bullet so you're finding a common space here on the shoulder so if you're bumping the shoulder back it's going to be measurable if you're only touching the neck the shoulder is not going to move at all and that's where this tool comes in a plan again it's a spin on okay it inserts into the comparator insert as well let's go ahead and put it on our calipers like so we're going to thumb screw it down and then zero out the scale if it's not at zero you see where abouts almost seven thousand take that back that's like littlewiggle these things around there we go we're at about 4000 0 the caliper on there and we're right at 2 inches now you see it's at 2 inches comparators about an inch and this is about an inch so right at 2 inches so what we want to do is then open up the caliper and take our case put it in and we should be measuring the same all three of these have been fired and they've not been resized so you can see we're at three point six two four you see that three point six two four and this next one should be almost identical and measure this one there we are six two four or six two five six two five but if I wiggle this around again a little bit this has to do this have not been D capped yet and you can see I've got some cratering on these so how the the amount of cratering depending on the load that was in this bullet would that crater face would actually push this away so that's within a thousandth okay and this one is also so I just want to show you all three of the same or very very similar and there we go three six two four so basically one point two four one sorry one point six to four inches one point six to four okay there six to four so all three of those are the same and I've got the shell plate in here for the proper for the 308 base and we're going to be resizing these obviously if you're going to be resizing you're going to want some resizing Lube right and with the the large bowl that cases I use the Imperial wax the stuff is phenomenal super slippery just a tiny little touch on your finger and then all you got to do is just wipe the case like so so we're going to do that one this one now any residual residue that's on your fingers you can actually wipe into the mouth that tends to help as well again the idea is you resize all your brass then you trim it if it's over length and then when you're done you would clean it up if you're only doing a few cases you can just use a cotton swab and clean out the mouth otherwise you probably want to tumble them alright so now we've got a good amount of Lube on those not too much obviously you will hydraulically dent your cases and wrinkle the shoulders and things like that now what we're going to do here is we're going to use a full length sizing guy and you can see this is in our CVS you can see it's seven millimeter oal now you use a full length die in a situation where you want your rounds that you're loading to fit in any of your rifles chambered in seven millimeter late this has been fired and it fits the chamber of the gun I'm currently using okay if I were to try to reload this just by neck sizing not touching the shoulder not touching the body I could only use that same rifle it might be looser in another rifle it might be so tight it won't chamber in another rifle then you come into headspace issues so if you want universal acceptance across all of your rifles that have our in the same chambering you want to use your full-length die the very first time you resize your brass you want to use a full length I then thereafter you want to choose between bump sizing and neck sizing only so let's go ahead and resize this with the full-length die of course I have my camera right in the way of my resizing we're going to reposition the camera here all right let me resize that a little bit cam over and you can see now that just based on the drag marks and the pulling up of the lube it did bump the shoulder going to clean it off a rag here we're going to remesh it just to show you what it did and I would have care to say it elongated the neck and bump the shoulder back quite a bit so in essence every time you do this what you're doing is you're flowing your shoulder into your neck and now you can see now we're at three six two three six almost 1:8 now if you can see that it's one nine one eight and a half I push it really hard it goes to one eight here we go so that bumped it back six thousandths okay now what bump sizing is is where you want to get the shoulder to bump back ever so slightly again you want for accuracy's sake you want the the cartridge to fill the chamber as tightly as possible this is going to be the loosest okay we went from six to four to six one eight so we lost six thousandths alright bump the shoulder backs there's gonna be a little bit of wiggle in the chamber with this round what you're doing with a bump sizing and again it's just a matter of adjusting the dial you want to back the die out four or five thousand so now that we know it bumps it back six we want to back this out four or five thousand so we want to give one to mm of play just to accommodate things like if I were to take these into the field okay say I had to do an interdiction with either a deer what have you I would do so with a field round not necessarily a bench round with a bench round I'd probably want to go to next sizing only and we'll get to that in just a second but with a bump okay all you're going to do is loosen the lock collar on your die here and then we're going to back the die out and we're just going to bump that shoulder ever so slightly what we're doing is we're allowing a little bit of give in that shoulder to chamber the round to accommodate for things like dust and grit and grind alright so I just back this out all the way we're going to back it out a full turn okay that's a lot when it comes to this die so we'll go back it out a full turn we're going to take this case here and we're just going to bump that shoulder again we're going to measure it first bump it and then measure it again so our first measure is two five okay six two five we're going to bump it again I backed out a full turn on the die give the good bump here okay and we're going to measure it again again that was nothing right all I basically did was i sized the body it didn't go enough into the die because the die is too far up so now we're going to slowly lower the die until we not 2000s or three thousands off of that how much play you want is pretty much from playing around at the range with your load data and determining what works best for your bullet in your load okay so we're going to pump that shoulder hopefully otherwise it's more tweaking and again it's just running the die down until we can bump the shoulder still it six to five do it again that definitely felt like it engaged the shoulder in fact you can tell it engage the shoulder just by looking at the imprint of the sizing loop there we go so we can see we bumped it back almost 3000 M see my reflection there hello so we bump that back about two and a half foul so this is something I would take into the field I wouldn't have to worry about you know missing something because it wouldn't chamber so say I have a shot on a deer or coyote or what have you and I go to chamber the round and it jams up because there's a lot of dirt and grit and all I've done is next size so next sizing is what you want for your most pristine of condition mainly if you're just going to be shooting off a bench for the day and you want to increase your accuracy as best possible this is the round of choice and it requires a different type of die okay they're all pretty much the same all right they serve the same purpose to set this one the neck is missing so all it's doing is it has a standoff inside and that is shaped like the shoulder but the neck portion has an insert so you take the top of the die off again I pull the decapping pin out of all these because I want to instant I want to inspect my primers and inside here is a bushing and these die bushings have different sizes and what you're doing with these different sized die bushings is you're controlling you can see that that actually says 3:09 okay that's point 3:09 outside circumference or outside diameter should I say here's a 308 get that the focus here we go 308 I've got a 310 and a 311 so you want to base this measurement off of how much neck tension you want one thing I want to point out is the when you insert the sizing bushing for the neck sizing you want to check to make sure let me get something to point with here excuse our little keye you want to make sure that the edge that's the case is feeding up into has the most bevel you can see this one has almost no bevel very very little bevel from the flat top here to the wall this is a very little bevel that falls across there if you rotate this guy around you can see there's a lot of bevel what that does is it helps guide the mouth or the neck up into the sizing bushing so in this case they're all stamped with the writing so you'd read it writing side up and drop it into the case or sorry drop it into the sizing die that way so here's our die take the bushing drop it in okay and then thread back on again run it all the way down until it hits and then back off slightly that little bit of cushion okay allows that bushing to float ever so slightly within its cavity and what it allows to happen is the bushing will Center on the neck of the case so as the case is coming up that the case doesn't have to deform to try to get into that squished area so for example if this bushing were offset to one side or the other it would deform the case slightly so by hitting the bushing and impinging it down in there and then backing off and letting it free float again you can hear that bushing bouncing around in there what that allows it to do is find true center alright so that's all there is to setting up the neck sizing dive of the bushing these are offered by all different companies in this case these bushings are not they're just standard steel bushings they also have carbide inserts and nitride coated things like that that add lubricity to this but again you want to make sure that your bevel that helps ease the mouth of the case into the bushing make sure those are facing down so that they can come up and find true center and you want to let it float in there otherwise if it's a skew to one side it's going to it's going to be off-center on case okay so you get a little bit of wiggle in the bushing so you want the bushing to be able to free float up and down one thing that does is it also helps it Center itself onto the neck so I'm going to bed size this guy okay and you can see it actually scored so I want to took that out I don't think I cleaned it you can see it actually scored the Scorch off the outside now this shoulder should be identical still yep 323 324 so that's sorry 624 so that stayed the same but what I did change was the actual mouth okay because now if I notice these two have been full length resized this one's just been next sized this one will have the tightest fit into the chamber okay this one was bumped sized so this will have the next tightest fit into the chamber and to accommodate some grit and some adverse conditions when you're shooting so say this is a field okay this is something you wanna shoot off a bench and it's going to give you should give you your best accuracy and then this one's full-length size this is the thing you should do when you first get your brass when it's brand new full length size it go out shoot and then go from there so I might have say three or four different rifles chambered in seven millimeter oh eight but the chamber and every single one of those is going to be chambered slightly different it's going to be cut a little deeper or a little shallower so you're going to want to keep these rounds handy if you want to shoot them across multiple rifles that way you don't have to load for each individual rifle if you don't want to and have a go to round that works well in all your rifles so that's the difference between next sizing shoulder bumping our bump sizing and full length sizing take care guys

Channel: undefined

Views: 387,080

Rating: 4.8202839 out of 5

Keywords: Neck Sizing, Bump Sizing, Full Length Sizing, Resizing Brass, Reloading

Id: V2Wt8-VqeAE

Length: 16min 46sec (1006 seconds)

Published: Fri Feb 28 2014