6.5 KillMore brass weights

[remington jim]

lol thought I would post up some empty - no primer 6.5 CM brass weights
Lightest to Heaviest .
Just for ? Well interest Sake.

All LRPrimer Brass .

Hornady. 152.5
Hornady Nickel plated 154.9
Sig 156.0
S&B 158.2
Barnes 158.3
Winchester 158.5
Barnes Nickel Plated 158.6
Nosler 159.0
Starline. 162.2
Aguila. 170.1
Federal 171.4

 

[MRP]

WOW! The pressure difference from top to bottom with the same load could be quite dramatic.
If you could check the water volume difference might be interesting.

 

[laker415]

I wonder where quality brass would fit in that list

 

[Hollow Point]

was this new unfired brass?

 

[bdb.hunting]

I wonder where quality brass would fit in that list

I am curious as well. I’d like to see Lapua, Peterson, ADG and Alpha brass weights in comparison. I also heard on a podcast (I think it was Hornady) that it’s said most of the weight difference is from the groove cut for the rim.

Volumes would also be neat to see but that isn’t as easy to do.

B

 

[remington jim]

was this new unfired brass?

No . all 1x fired and resized - cleaned . RJ

 

[nowarningshot]

I am curious as well. I’d like to see Lapua, Peterson, ADG and Alpha brass weights in comparison. I also heard on a podcast (I think it was Hornady) that it’s said most of the weight difference is from the groove cut for the rim.

Volumes would also be neat to see but that isn’t as easy to do.

B

That's interesting, I always thought differences were in brass thickness. That heavier brass would have less volume capacity, since external dimension should be identical brand to brand. Totally makes sense, tiny differences of a thousandth or two, caused by Monday, hung over, worn tooling.

Talking about creedmore, first and foremost a target cartridge. I've reloaded for decades, but I'm a hunter. Tried to avoid going down the case prep rabbit hole.

 

[bdb.hunting]

That's interesting, I always thought differences were in brass thickness. That heavier brass would have less volume capacity, since external dimension should be identical brand to brand. Totally makes sense, tiny differences of a thousandth or two, caused by Monday, hung over, worn tooling.

Talking about creedmore, first and foremost a target cartridge. I've reloaded for decades, but I'm a hunter. Tried to avoid going down the case prep rabbit hole.

Yeah I thought so too. From the sounds of it that makes up very little variation in comparison to the extractor groove cut. I’ll see if I can find the episode and time for others to listen too. I’ve been listening to lots lately cause I got nothing better to do during physical rehabilitation haha.

B

 

[MRP]

Could be bad math but my miscalculations came up with 2.237691961 grains of water difference IF all the volume difference is on the inside.
Quick load gives its volume at 53.5 grains Wikipedia gives it 52.5, either way that could be a 4% volume difference... depending on which case is right.

Guess I have nothing better to do this morning too.

 

[Raton57]

All except the bottom two would affect much The others not enough difference to notice much.

 

[Potasz]

I weighed Lapua small primer 167.9 - 168.3 gr

 

[bdb.hunting]

I weighed Lapua small primer 167.9 - 168.3 gr

That seems right for what I’d expect out of the SRP stuff being a little bit heavier than most. (Except for the outliers)

Now I wanna know how they compare to LRP now. So many questions but not enough brass on hand to do anything.

B

 

[nowarningshot]

I weighed Lapua small primer 167.9 - 168.3 gr

Putting that in perspective. A 0.1 gr weight is about 3 granules of some of the bigger magnum powders, so about 12 fly shets of powder or someone coughing across the room.

I'm out of my depth, and am already somewhat down the brass prep rabbit hole. Suppose if someone believes it matters, it does. Me, 1 to 3/4 moa, go find some fresh liver.

 

[Lead hammer]

I’m just beginning to start switching over from Hornady brass to Lapua
My 6.5CM Hornady load is 41.1 grains of H4350, my Lapua is 39.9. I have not measured speed yet but they impact the same at 100 meters.

 

[jamesharrison]

Granted this is not 6.5CM, but to give you an example of why you cannot just look at the dry weight of brass, but rather you must determine the net case capacity of cases, here are some .30-06 cases:

Brass	DRY Wgt.	WET Wgt.	H2O cap.
HORNADY	179.9	251.3	71.4
PPU	182.6	253.4	70.8
norma	182.9	253.3	70.4
BARNES	202.4	272.3	69.9
R-P	202.3	270.3	68.0
BROWNING	204.4	271.7	67.3
METALLVERKEN	207.8	276.5	68.7
FC	208.4	275.0	66.6

There is only a 4.8 gr. difference in net case capacity between all of the cases, notwithstanding the 28.5 grain difference in dry weights between the lightest & heaviest cases.

It is especially apparent when you look at the Remington & Barnes brass. Despite the Remington brass weighing a 1/10th of a grain less than the Barnes, the Barnes case has just shy of 2 grains more capacity, which, I grant you is only 3% difference.

 

[wallz]

lol thought I would post up some empty - no primer 6.5 CM brass weights

Lightest to Heaviest .

Just for ? Well interest Sake.

All LRPrimer Brass .

Hornady. 152.5

Hornady Nickel plated 154.9

Sig 156.0

S&B 158.2

Barnes 158.3

Winchester 158.5

Barnes Nickel Plated 158.6

Nosler 159.0

Starline. 162.2

Aguila. 170.1

Federal 171.4

Thats interesting. When I was LRP, I used S&B and Lapua brass. Could not find anything to say one was better than the other. I did segregate them, and they did anneal a bit differently on the home made induction annealer. But other than annealing I prepped them the same. Could not tell the groups apart one from the other in use. Same speeds, same ES, DS spreads. Not enough to make a difference in my books.

Now went over to SRP brass, and mostly starline, and some LAPUA. I'll have to watch it and see if there is any inherent difference between the two. Still on the 1st new firing, so no prep yet on it. other than mandrel size, bedur in and out before loading up.

Then again I'm just a casual for the fun shooter, and not competitive.

 

[remington jim]

Wally I just bought a 100 Peterson SRP and a 100 Starline SRP Brass to try out . just after I sold u the Lapua brass I bought another 6.5 CM ! lol I will add my brass weights . RJ

 

[wallz]

Wally I just bought a 100 Peterson SRP and a 100 Starline SRP Brass to try out . just after I sold u the Lapua brass I bought another 6.5 CM ! lol I will add my brass weights . RJ

Couldn't do without the "man" bun eh!

 

[boxhitch]

Caveat to this would be which brass is included, likely 'as sold' / 'off the shelf' , one may be more or less over-size/under-size than another
true comparison would be after firing in one chamber at a specific pressure, to see how size/volume changes and compares after

Granted this is not 6.5CM, but to give you an example of why you cannot just look at the dry weight of brass, but rather you must determine the net case capacity of cases, here are some .30-06 cases:

Brass	DRY Wgt.	WET Wgt.	H2O cap.
HORNADY	179.9	251.3	71.4
PPU	182.6	253.4	70.8
norma	182.9	253.3	70.4
BARNES	202.4	272.3	69.9
R-P	202.3	270.3	68.0
BROWNING	204.4	271.7	67.3
METALLVERKEN	207.8	276.5	68.7
FC	208.4	275.0	66.6

There is only a 4.8 gr. difference in net case capacity between all of the cases, notwithstanding the 28.5 grain difference in dry weights between the lightest & heaviest cases.

It is especially apparent when you look at the Remington & Barnes brass. Despite the Remington brass weighing a 1/10th of a grain less than the Barnes, the Barnes case has just shy of 2 grains more capacity, which, I grant you is only 3% difference.

 

[old303]

Large rifle primers have been like hen's teeth lately, so Lapua SRP brass is looking pretty good just for its primer pockets.