284 win loads

#16 Postby **AlanF** » Wed Sep 05, 2012 10:17 pm

bruce moulds wrote:further to what alan says re pressure, my top 2 loads of 2209 had clicking when i lifted the bolt.
the load was safe, but extraction was becoming a bit tight. don't go there.
i have had loose primers in all calibres from 17 to 22, up to 9.3 and 375.
brass can only take so much.
alan, what powder do you use with 168s?
keep safe,
bruce.

57.3 of N165 (Shehane chamber)

bruce moulds · #17 Postby **bruce moulds** » Sun Sep 09, 2012 9:32 pm

denis,
how is it all coming along?
bruce.

DenisA · #18 Postby **DenisA** » Sun Sep 09, 2012 10:52 pm

Hi Bruce, thanks for the interest. I haven't had an opportunity to further load test the .284............ to busy playing 6BR this weekend.

I will keep you updated though.

Cheers, Denis.

DenisA · #19 Postby **DenisA** » Sun Sep 16, 2012 10:15 pm

G'day Bruce,

RE: AR2213sc and 180g Hyb's.

I load tested:
55.6g - Ave 2808 fps - well formed .5moa group. Less if not for 1 slight stray.
55.9g - Ave 2831 fps - strung horizontally 1 moa
56.2g - Ave 2855 fps - 4 shots in .3moa & a 1.25" high flyer
56.5g - Ave 2872 fps - stung vertically 1.5 moa
56.8g - Ave 2901 fps - Started to show excess pressure. Ejector pin marks. 1moa group.

Theres a definate node between 55.6 and 56.2 though that high flyer at 56.2 is something I want to stay away from. It resembles shots in the 56.5 vert string.
I think I'll load test from 55.6 to 55.9 in .1 g increments as there are no high flyers and I think 2820ish fps might be a good compromise with barrel and case life.

An interesting experience today. A friend asked me to shoot his 7mm Mag through the chrony. He said he was running approx 10g more powder than mine, the same bullet, same barrel twist, same barrel length and it resulted with 2940fps.
I was suprised at the efficency of the .284 running not far behind with much less powder. Though excess pressure limits my the .284 at around 2900fps.

DenisA · #20 Postby **DenisA** » Mon Sep 17, 2012 7:38 pm

AlanF wrote:Denis,

In my experience, the limiting factor with the Lapua 6.5-284 case expanded to 7mm is the case head - loose primers will be the first casualty if your pressure gets too high. Try your 57gn loads then see how easily the next primers go in.

Hi Alan, your spot on. I de-primed the above brass tonight and the 56.8g case primers came out much, much, much easier than the 55.6g.
Still O.K though I think. I'll see how they prime.

Because of your advice I didn't want to test the 57.1g and now I think that was definately the right decision.

Thanks very much for the advice.

Hearing about all these small characteristics of a cartridge by such knowledgable people that have seen it all before really advances the understanding of a cartridge and its idiosyncrasies.

I really appreciate all the input.

Cheers guys, Denis.

#21 Postby **AlanF** » Mon Sep 17, 2012 7:48 pm

Glad to help Denis. Just don't get too good too soon or we might regret it (just joking). Actually I do remember giving a new shooter some wind reading tips once. The next Queens we met at, he beat me into second place :cry:

.

Alan

RAVEN · #22 Postby **RAVEN** » Mon Sep 17, 2012 8:57 pm

Geezz Alan you have never given me any

#23 Postby **AlanF** » Mon Sep 17, 2012 9:00 pm

RAVEN wrote:Geezz Alan you have never given me any

Nor you me :lol:

.

bruce moulds · #24 Postby **bruce moulds** » Mon Sep 17, 2012 9:27 pm

hi denis,
fun aint it.
you seem to be obeying the first rule of load development, which is to be honest with yourself.
second rule is let accuracy be the goal. no one ever won a shoot with the fastest bullets.
you would be surprised how impossible it is in the real world to tell the difference between 2720 amd 2820, other than comeups.
plenty of room to play with seating depths and primers.
then it is worth establishing a low standard deviation for velocity. this will require at least a 20 shot string.
hang in there.
keep safe,
bruce.

bruce moulds · #25 Postby **bruce moulds** » Mon Sep 17, 2012 9:30 pm

alan & rich,
have at it at the sara queens.
no holds barred, and no quarter given.
i have bad vert, and no time to do anything about it, so probably won't be in the mix.
keep safe,
bruce.

#26 Postby **AlanF** » Mon Sep 17, 2012 9:33 pm

bruce moulds wrote:alan & rich,
have at it at the sara queens.
no holds barred, and no quarter given.
i have bad vert, and no time to do anything about it, so probably won't be in the mix.
keep safe,
bruce.

Can I bring 4 barrels?

BTW Bruce, the leadup is for sorting out your vert.

RAVEN · #27 Postby **RAVEN** » Mon Sep 17, 2012 10:22 pm

bugger it Alan bring the lot :lol:

#28 Postby **AlanF** » Mon Sep 17, 2012 10:42 pm

RAVEN wrote:bugger it Alan bring the lot

I'll bring a caddy to advise which barrel for each shot....

RAVEN · #29 Postby **RAVEN** » Mon Sep 17, 2012 11:44 pm

Alan don’t believe a word Bruce says he’s just trying to lull you into the notion that he will be an easy beat in 2012 a good dose of under pant soup for breaky should sort all his vert but there may be some back pressure depending on what neck tension he is using.
RB :lol:

Norm · #30 Postby **Norm** » Tue Sep 18, 2012 3:54 pm

Been doing a bit of testing with a few different combinations. Here are the results.
Any thoughts?

180gn Berger Hybrid 0.020" jump to lands

54gn AR2213sc. = 2703fps.

180gn Berger Hybrid, 0.010" into lands.

54gn AR2213sc = 2788fps.

This is the load that I am using at the moment. Not real happy with it and am thinking of raising the powder charge to 54.5gn.

180gn Berger Hybrid, 0.010" into lands.

50gn RE17 = 2827fps.

51gn RE17 = 2857fps.

52gn RE17 = 2921fps.

190gn Matrix, 0.007" into lands.

48gn RE17 = 2665fps.

49gn RE17 = 2723fps.

168gn G7 Projectile, 0.010" jump to lands.

53gn RE17 = 2974fps.

54gn RE17 = 3035fps.

284 win loads

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