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Post by delawarebaydog on Jan 14, 2010 10:02:16 GMT -5
One of my hunting buddies has been using 48.5 gns of 4759 in his gun and getting good results. Everything I see on any load charts tells me that is too much. Does anybody have any experiance or opinion on this? Thanks in advance for the help. Tom
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Post by mike3132 on Jan 14, 2010 10:14:32 GMT -5
Hes right on the edge of sabot failure using that much powder. 42-43 grains is usually the most accurate in a .50. Mike
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Post by corvair on Jan 14, 2010 11:45:57 GMT -5
In my Savage 50 I use 43gr 4759 and in my NULA 50 I use 42gr 4759. Bullet/sabot for both loads is the Parker 275gr BE/mmp Sabot supplied by Parker.
48 grains sounds way to high, he might limit to 45 gr max.
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Post by pposey on Jan 14, 2010 11:58:04 GMT -5
42 grains is all I ever could do in my 50cal barrel and still blew a couple sabots
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Post by chuck41 on Jan 14, 2010 11:59:23 GMT -5
You didn't specify the bullet weight, but even with a 250gr that sounds like what Mike said. Right on the verge of sabot failure.
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Post by delawarebaydog on Jan 14, 2010 14:33:41 GMT -5
It is a 250 gr, SST. Thanks for the help. Tom
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esmd
8 Pointer
Bill Drain
Posts: 109
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Post by esmd on Jan 14, 2010 16:03:13 GMT -5
I load 43 grains for both my father and brother. I always told them they could go higher if they choose, but that I wouldn't go above 45 grains.
Thing is, if he's getting good results, my only concern at that point would be the pressure of the load.
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Post by Guessed on Jan 14, 2010 17:40:55 GMT -5
{Just back from Butchering}
I run 49 grains of 4759([plastic jug) under a 44/300 XTP for MOA groups and have gone to 50 grains with less accuracy. I use a Harvester smooth green and don't have to paper wrap the bullet like when I use RL7 due to the faster burn rate of of the IMR. I've never blown a sabot with 4759 even in 75 degree weather and firmly believe that the sabot will drill long before the barrel will rupture, based on the many drilled sabots I've created with diffrerent loads. When experimenting with the faster powders, I am a bit leery of taking the pressure up to sabot shredding levels.
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Post by herman on Jan 14, 2010 19:02:25 GMT -5
I have put 100's of shots down range with my savages and many more shooting someone else rifle useing 47.5 grs (metal cans)
There is a big differance in the old and new lot numbers,I have shot up to 50 grs with the new (plastic jugs) and still didn't get the speed as the old lot.Have used the 47.5 gr with 250 sst and xtp 250 and shot some with the 300 gr and haven't blown a sabot.
The most accurate load with the plastic jug for me is 45 grs and a 250 sst.
Have probably shot around 10 to 15 lbs of the old lot number and about 3 lbs of the new.Wished I still had plenty more of the old lot number.
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Post by ET on Jan 14, 2010 22:12:17 GMT -5
This year I will be forging into the plastic-1lb container of 4759 as I am almost finished with my last ½-lb tin can. Now so far I have read that an additional 2gr is need from the plastic container to match the old tin can container of 4759. What I find ironic here is if I now need 45gr of 4759 for 2300fps this would match the old recommended load of 45gr of 4227. This would put the 2-powders at par for burn rate in the 50cal. This could prove interesting as when I got 4227 to work back then it produced some good groups for me.
It will be interesting to see what my chrony displays.
Ed
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esmd
8 Pointer
Bill Drain
Posts: 109
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Post by esmd on Jan 15, 2010 16:11:38 GMT -5
My brother was shooting 43gr of the plastic jug variety, but I found a local source with a good supply of the 1/2 lb tin cans and got my Dad and Brother to both buy two cans. I'm going to try and get to the range with my brother in the spring and have him shoot over the chrono.
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Post by shoot2reload on Jan 15, 2010 18:55:55 GMT -5
I'm hoping my gun can make peace with IMR 4759. I was given an 8oz tin of the older version, and shooting a 250gr XTP with a MMP black sabot is a disaster. At 100 yards I'm looking at about 3" groups (compared to my cloverleaf AA-5744).
Granted, I only shot the groups with one charge (43.0gr), so I probably haven't given it a fair shake. But compared to the slam-dunk I had with 5744 this is going to take more work.
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Post by ozark on Jan 16, 2010 15:20:39 GMT -5
To be a real Savage ML Smokeless shooter a certain mindset is required. If you develop a load that is giving complete satisfaction you must be willing to put that success behind you and begin with a different combination of ingredients. If you start shooting clover leaf groups report it but in the same report explain how you are going to get a different bullet, different powder and head for new ground. It is standard operating procedures.
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Post by mike3132 on Jan 16, 2010 17:42:15 GMT -5
Change the sabot to a Harvester short black sabot and see how it shoots. Mike
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Post by shoot2reload on Jan 16, 2010 18:34:47 GMT -5
Change the sabot to a Harvester short black sabot and see how it shoots. Mike Will try that. Thanks for the tip! |
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Post by dans on Jan 17, 2010 9:38:09 GMT -5
The new 4759 the plastic jug variety will require an adjustment to match the velocity of the old metal can variety. If the sabots are holding up, I don't believe that the pressure is too much. I am finding after nearly 10 years of 50 cal shooting that 2200 to 2300 f/s velocity is about right for accuracy and killing power with tolerable recoil using a 250 grain bullet. Zeroed 3 inches high at 100 is usually about 3-4 inches low at 200 and I can live with that.
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