anyone running a 1 in 8 with 75eldm, lapua brass and 2208 fed 205 srp
looking to compare recipes. Have GRT and a couple of manuals to reference too.
cheers
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anyone running a 1 in 8 with 75eldm, lapua brass and 2208 fed 205 srp
looking to compare recipes. Have GRT and a couple of manuals to reference too.
cheers
Why?
Close. I'm running the 75 and 73gn ELDM's Nosler Brass Fed 205 Primer and 25gns of 2208. This is a compressed load which I worked up to. Velocity is 2795 out of a 20" barrel in my Tikka T3x. Velocity, POI and pressures are the same for both the 73 and 75gn.
context
@Pommy
75gr eldm - Seated long @2.440", adi brass, cci400, 2206h 24.5gr = 2920fps 22" tikka barrel.
Must be over pressure but is only slightly cratering the primer, no other signs or bolt/extraction issues.
I modified a tikka mag to take 2.6"+
Over all length is the critical thing with that bullet to avoiding pressure in a 223. You’ll get over pressure fast if you have to run close to SAMI length for mag feeding
That being said I run them loong COAL 2.45” with 24.6gr of 08 for 2900fps I’m the 24” tikka. I know a mate that runs them up to 25gr
From other loads I’ve seen around the 24.5gr mark is a sweet spot
Lapua brass is much heavier than most US brass so has less capacity. I would work up towards the listed velocity which is likely to be reached with less powder. Case capacity could be an issue as well.
GPM.
Overall weight is a poor measure of internal capacity. I cant find (be bothered looking) my old data but a quick check this morning on only a single case of eachQuote:
Originally Posted by grandpamac
.................................................. ................Lapua .........ADI.........Hornady...............OSA
Dry weight (grns) .........................................98.8..... .......99.7.........96.7...................94.2
Capacity in grains of water..............................30.4........... .30.2..........30.2..................30.9
Maybe a fair bit of variation too ? ADI and OSA come from same plant over here?
On topic , I run 25gns of 2208 behind a 80.5 Berger seated just off the lands in a t3 varmit. Single load or in a waters 2.8 magazine. LC brass, fed match primers.
Sent from my iPhone using Tapatalk
What is the 'context' you seek @ilikepie? Sanity check? Realistic velocity expectations? You don't mention if you are using a good chronograph to find out what speeds you are getting with your combination of components in your rifle.
If you give GRT good quality inputs then it will give you good guidance. I'm not sure if you're aware of it, but you can tune the powder profile to reflect what you have available more closely.
@grandpamac - in 223 the Lapua brass is similar in capacity to most other brands (in my experience). The one that might catch people out is the Starline brass as it is one of the lowest capacity brands on the market. It is great stuff particularly given the price, but caution is required (as always) when working up loads for it with data based on higher capacity.
Yes even within brands you get variation but my point was not that a particular brand will have X capacity but that over all weight is often not representative of internal capacity when comparing brands. I used a much larger sample when i first tried it and thats the conculsion I reached, repeated this morning in a very small sample.Quote:
Originally Posted by Dicko
Greetings All,
Granted that changes in weight do not match changes in case capacity but it is indicative as shown by @sneeze figures. My own weighing showed (for the .223 only) Federal being the lightest at around 89 grains including fired primer up to the continental brass including Lapua at around 105 grains. Rather than try to measure case capacity (which should be to the base of a seated projectile) with water (messy and inexact) I just segregate the brass by head stamp and if possible lot and develop loads working up with the chronograph to the Hodgdon/ADI velocity adjusted for barrel length. It works for me. Recent work with BM8208 has shown significantly less velocity than the Hodgdon/ADI data suggests and more in line with the Hornady data so for me a decent chronograph is an essential piece of kit for load development.
Regards Grandpamac.
My completely unscientific sample of one shows 2 cases very similar with one other supporting your claim and one that dosn't so Im struggling to see " indicitive" in a 50-50ish result. I guess one mans indicative is another's disproven theory. I don't think bullet seating depth is relevant when simply comparing capacities across brands.Quote:
Originally Posted by grandpamac
Reading between the lines here it seems you've not actually checked internal volume? just gone off the old collective wisdom of more weight is less volume?
The only way to measure case capacity is full to the top of the neck with H20, otherwise its too inaccurate, even flush, convex, concave with the mouth makes a difference
Apparently Sth Island water weighs less that Nth Island water so bare that in mind with your calculations :)
I think its because of the abundance of energy drinks in the NIQuote:
Originally Posted by Kiwi Greg
Heh, a better reply would have been "Duely noted"Quote:
Originally Posted by Kiwi Greg
Been playing around with loads for my mates Ruger Ranch; 16" barrel with the 77gr Scenar.
Just struck on a load over the weekend that we have been working up to with GRT - hit 2730fps using Leverevolution. GRT puts this at approx. 57k PSI based on previous ladder testing and velocity data we have loaded in, at 98% case capacity.
This was not the top load GRT spat out either.
This is using PPU Brass; H2O volume of 30.4gr, OAL loaded at 57.5mm to fit the plastic STANAG mags.
Happy to share load via DM - as always, work your way up.
Cam
I’m using .3 less ar2208 powder and a larger bushing for neck tension with Lapua brass compared to the FC, RP, and starline brass. Don’t have compressed loads anymore since the got chamber long throated for 80 grainers.
Now setting AOL 2.530” for all ELD-m 73gr, 75gr and 80gr using a Waterman magazine.