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Max Online: 16728 @ 03/25/12 08:51 AM
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#5956478 - 10/01/15 03:18 PM 300 win mag load development-190 ab lr IMR 7977
Cleric Offline
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Registered: 03/11/12
Posts: 2779
So if all goes well I will be at the range sunday morning developing my load.

only recipe i can find is from hodgdon/imr and is min 71 max 76.4

if go by .3s thats a lot of rounds frown. Since i only a 100-200 yard range, can't do ladder test.

Book max velocity is 2963. I have an extra inch of barrel and would love to be at 3k




Edited by Cleric (10/01/15 03:38 PM)

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#5956490 - 10/01/15 03:24 PM Re: 300 win mag load development-190 ab lr IMR 7877 [Re: Cleric]
ChadTRG42 Online   happy
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Registered: 09/16/09
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Loc: Lewisville, TX
I've loaded your exact combo (but with 7977). The 76.4 is a conservative charge. You can easily get another grain or 1.5 before you hit max. Seat the LR AB about .050" off the lands, and you'll be good. They will not shoot well touching the lands. If you are using Norma/Nosler brass, reduce that by about .5 grain.
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#5956516 - 10/01/15 03:37 PM Re: 300 win mag load development-190 ab lr IMR 7877 [Re: Cleric]
Cleric Offline
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I am using 7977. Sorry for the typo. Winchester brass with cci large mag primers.

Good to know I got more room. I may jump in .7 jumps to get up to higher loads faster

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#5956521 - 10/01/15 03:39 PM Re: 300 win mag load development-190 ab lr IMR 7877 [Re: Cleric]
ChadTRG42 Online   happy
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I'd recommend the Fed 215 primers. CCI #250 are a little light, but they will work. The CCI #250 mag primers are rated between a standard and magnum primer. Yes, they are labeled as magnum, but on the scale of all magnum primers, they fall right in the middle. Your 2 hottest primers are the Fed 215 and Rem LR magnum primers, which are best for slow powders.
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#5958002 - 10/02/15 03:24 PM Re: 300 win mag load development-190 ab lr IMR 7877 [Re: Cleric]
Cleric Offline
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Registered: 03/11/12
Posts: 2779
Thanks. I will look into getting this primers. If not I will roll cci

Just wish I had my lab radar frown

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#5958384 - 10/02/15 09:05 PM Re: 300 win mag load development-190 ab lr IMR 7877 [Re: Cleric]
Dien Offline
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Registered: 08/16/12
Posts: 462
Loc: Grand Prairie
Gander mtn in Arlington had a couple bricks of Fed 215.

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#5958709 - 10/03/15 07:55 AM Re: 300 win mag load development-190 ab lr IMR 7877 [Re: Cleric]
Big Fitz Online   content
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Registered: 12/06/09
Posts: 2149
Loc: McKinney, TX
Cleric, not sure where you live but I can spare a sleeve of Fed Large Mag Rifle Match primers if you want to try them. Not sure how they compare to the regular 215s. PM me if interested.
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#5960250 - 10/04/15 12:44 PM Re: 300 win mag load development-190 ab lr IMR 7877 [Re: Cleric]
Cleric Offline
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Registered: 03/11/12
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Just got back from the range....

75 grains avg 2759 Es 15
76 grains avg 2754 Es 76. Good group 1in edge to edge
76.3 grains avg 2852 Es 44. One flier, edge to edge .86
76.7 grains avg 2879 Es 28. Decent vertical, bad horizontal
77 grains avg 3068 Es 99. Bad group
77.3 grains avg 2928 Es 14 1.2 edge to edge
77.6 grains avg 2949 Es 22
77.9 grains avg 2879 Es 28 3 shot group edge to edge .7 two fliers touching pulled left

I think my barrel heat up through test drove some bad groups. I was surprised the 77 load was highest velocity.

Right now it's either 76 or try 77.9 and see if I can get that tighter with a cooler barrel

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#5971785 - 10/11/15 12:51 PM Re: 300 win mag load development-190 ab lr IMR 7877 [Re: Cleric]
Cleric Offline
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Registered: 03/11/12
Posts: 2779
Got it where I like it now...

77.9 grains. Had a 3 shot group .65 edge to edge.

Just need to play with trueing to get my velocity right.

Thanks chad for your help

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#5973462 - 10/12/15 12:42 PM Re: 300 win mag load development-190 ab lr IMR 7877 [Re: Cleric]
ChadTRG42 Online   happy
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Registered: 09/16/09
Posts: 10390
Loc: Lewisville, TX
You're welcome!!! Good to hear!
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