28 nosler

cjuve

Well-Known Member
Joined
Feb 15, 2011
Messages
411
Location
SPRING CREEK, NEVADA
Thanks cjuve .. My smith is building mine to 3.73 coal to the lands so I should be very close to the same as you .. My barrel is 30 inches long so I should get 3175 or so easy with retumbo it looks like .

No problem, when I first started working with this cartridge there was not a lot of info out there so I struggled a bit to get things going, just wanted to share the info. For what it is worth it looks like I am going to end up at 79.5 gr with an avg. velocity around 3065 FPS. I am already getting a single digit standard deviation and have not fussed with seating depth at all, looks like there is some good long range potential there.
 

Longrangec

Member
Joined
Jan 24, 2017
Messages
9
Alright thanks for all the info so far .. the more info I get the easier load development will be and it will be cheaper on the wallet. I'm gonna start loading at 78 and ease into it ..
 

breakshntr

Active Member
Joined
Nov 10, 2015
Messages
35
Location
Missouri River Breaks
Just started load development with my 28 nosler and Retumbo
As stated before this is a long throat version so these loads are not suggested for a standard rifle throat configuration.

195 Berger EOL
CCI 250 primer
Retumbo
26" Brux barrel
.280 freebore
Coal = 3.740 +/- .020 jump
Magneto speed

75 gr - 2906 FPS
76 gr - 2934 FPS
77 gr- 2920 FPS. Delayed ignition
78 gr - 3007 FPS highest shot on target
79 gr - 3065 FPS 79,80,81 formed .520" group
80 gr - 3077 FPS 80 and 81 went into same hole
81 gr - 3112 FPS
81.5 - 3137 FPS bolt was a little stiffer extraction was easy
82 gr - 3136 FPS bolt was stiffer yet 1/2" lower POI
82.5 - did not shoot

I am going to load from 79.0 - 80.5 and compare POI looks like there may be a pretty good node there with decent velocities.
This is excellent news. I will surely be testing me some Retumbo. Looks like 100fps less velocity at best vs. RE33 as long as I can find solid accuracy I will be very happy knowing Im running a stable powder. Still a long range hammer.
 
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