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Do you think its posible to hit 3050 on fps using 180hybrid with h1000? With my 30" barrel?Bjay,
H1000 is where it's at for the 180's in my testing. Retumbo was too slow and H4831sc was too fast for the 180's. With H4831sc I hit pressure before getting to my desired speed. 58.0 of H1000 should be a REALLY safe place to start. Run it over a chrono and start lookin once you get to 2900. The middle 60's is probably where you will end up.
Had this recently chambered
Bighorn SA
Brux 27" 9 twist
throated for 180 Hybrids, .015 jump @ 2.95+/-
Chambered by Jon Beanland
So far this load is looking good.
60.5 4831SC
Wolf LRM
Remington brass
2920fps
More from me as I continue to learn about the 7 SAUM.
I have had the rifle (26" Krieger 9twist on a short action) and load (180gr Hybrid pointed, over H4831sc in Nosler and Remington brass) out in WY and at Alleghany Sniper Challenge.
My conclusions:
(1) H4831sc is too fast for the 180gr Hybrid, producing pressure signs. Great accuracy and low muzzle velocity variation, but beats the crap out of the brass.
(2) H4831sc is great for the 162/168gr weight class.
(3) Remington brass has a larger flash hole and as such results in pressure signs before the Nosler brass does. Otherwise, the two cases are both very similar in the field - each offered low MV variation and very good precision on paper. I did weight sort the Remington brass and sold about 1/3 of the lot because it was significantly less weight than the other 2/3.
I'm now going down the H-1000 and Retumbo powder route, with priority on H-1000.
You'll easily be able to achieve 2900fps..I've had mine to 3023fps with Retumbo but it just wasn't as accurate as 2932fps with the H-1000. Still very accurate especially for a hunting gun.
What is the max load for SHORT ACTION oal 2.950 combo 180 hybrid and h1000 for those who done testing
fps?
.
That is a good question and one that I'm going to try an answer this weekend. I have data on H-1000 max charges but it was when my barrel was brand new (<20rds thru it). I unfortunately decided to go with H4831sc and the 180gr Hybrids at 2.950". I had great results but it was too tough on brass. Testing this weekend H-1000 and Retumbo in my 26" Krieger 9 twist, short action. I will post result by charge up here.
Ty sirfor sharing ive been waiting for your come back for the results...i couldnt shoot yester it was pouring..this confirm my findings that 63gr of h1000 realy max for us shorty action.. now ill start searchin for retumbo and try it.. im sure my longer barrel wil love slower powderOK, I got out to range this weekend to test slower powders (H-1000 and Retumbo). After struggling with H4831sc pressure signs in the big 180gr heavies, I decided to throw out that stuff and moved on in interest of saving the brass.
First specs on the load and rifle:
- Nosler brass, two or three firings on it
- Fed primers (210 I believe)
- 180gr Berger Hybrids
- Loaded to 2.950" OAL
- short action (Stiller Tac-30)
- custom chamber from PT&G putting the 180gr Hybrid 0.01" jump at 2.950" (chamber has 700 rds thru it, so its jumping more now I'm sure)
- Krieger 9 twist finished at 26" with a APA LB brake
Powders and charges tested (all loads tested with a Magneto barrel mounted magnetic chronograph that has proven good results):
Retumbo-
62.5grs - yielded avg MV of 2906 - absolute no pressure signs - extremely 'gentle' recoil impulse, a real pleasure to shoot
63.5grs - MV 2942 - no pressure signs - still a gentle recoil impulse
64.5grs - MV 2977 - no pressure signs on the brass or the bolt lift, but that gentle recoil impulse is turning harder
65.0grs - MV 3015 - little ejector mark, stiffer than normal bolt lift, no more gentle recoil impulse - this is the top of the safe pressure curve
H-1000-
61.0grs - MV 2895 - no pressure signs, but a sharp recoil impulse
62.0grs - MV 2915 - stiffer than normal bolt lift, sharp recoil impulse
63.0grs - MV 2955 - light ejector mark, stiff bolt lift, sharp recoil impulse - this is the top of the safe pressure curve
64.0grs - not fired
So, overall, I found Retumbo in the 62-64grs range a joy to shoot from a recoil perspective, good pressure curves and within the targetted MV objective (2900 or better). I plan on testing 62.0, 62.5 and 63.0 for more data on precision, ES/SD. This should put me a full 2 grains under the top of the safe pressure curve.
I'm dropping H-1000.
My pleasure BJay- hopefully some of my data is of help. With 28" barrel, you might pick up 50fps over my numbers with Retumbo (I'm at 26" and you could be looking at 25fps/inch with Retumbo).
One thing I will caution: this is Nosler brass, NOT Remington. I have noticed that Nosler flash holes are smaller than Remington and perhaps result in better pressures. With the Remington brass and H4831sc, I was getting pressure signs much earlier and at much lower MVs than the Noslers. I have done no testing with Remigton brass and Retumbo or H-1000.
BJ,
If speed is what you need, try RL-25.
shot #5
62.60 H100 4 shot fps 2847/2832/2859/2831 (kinda slow but accurate) bolt hard to lift..can someone tell me what moa is this result?
Ty sir.Sure, it is ~0.4 moa. To calculate approximate moa, simply divided the group size in inches by the range in yards and multiple the result by 100. So in this case, its: 1.6"/400yds * 100 = 0.4.
If you are getting a stiff bolt, don't use the load. Its overpressure and that pressure will kill the brass earlier. This is expensive brass that is hard to get. You don't want to kill the brass w/o getting 7-10reloads (or more) on them. Just my view
RL25 looks promising. I would abandon H-1000. I would also test Retumbo.
Ty sir.
Ill try find retumbo and try them..your retumbo test up to to 65.50 isnt thst too compress.that proly full on case and seating the long hybrids on 2.950
Interesting thread guys! I'm shooting an FN SPR rebarreled with a Rock 8.7 twist 26" tube.
My best load to date uses Remy brass,mid 60's of H1000, Berger 180 vld's hbn coated. @ 2850.
In search of knowledge I tried a different combo yesterday. 59 to 66 gr. of Retumbo,180 gr. SMK's again hbn coated. Ye olde Magneto speed indicated 2962 fps with the 66 gr. charge. A bit of pressure was evident but within reason. No accuracy work was done but I will run a ladder from 62 grains on up. I don't expect the results to equal my H1000/Berger combo but one never knows.
coming out from 26" barrel 2850 is great speed with 180 if accuracy is there, keep it try 2962 how great accuracy..thats incredible speed..but 62-66 retumbo i think its pretty compress..
mave you tried h1000 or 4831sc with the length of your barrel it should be good..i think magnum powder works better on 26+ barrel..my barrel is 30" and rl25 61gr im getting 2931 average.I'm currently trying out 180 hybrids using Remington brass. I shot Ramshot Magnum at 450 yards today, and got really good results, but speeds were all over the place. I have a 24" barrel, and was thinking of trying out Retumbo since I have 2 lbs of it. I did get to 2920 fps with Magnum but stop at hard bolt lift.