Advice on Load Development

Mark37082

Well-Known Member
Joined
Sep 30, 2021
Messages
255
Location
Tennessee
Given the current difficulties in securing components, I am struggling with where to start with the existing on hand supples. This is what I have for the 7RM (9.5 twist Bergara HMR):
Powder: IMR4831(less than 1lb) 4350 (almost a lb), 4064, RL17
Primer: Fed GM215M
Brass: ADG (new)
Bullets: Nosler AB 160gr (limited to about 30), Nosler etip 150gr, Berger CH 168gr (80 or so), Hammer 146gr (100).
I really wish I could find some more AB 160’s. Rifle seems to like them with 4831.
I really don’t know where to start with the Hammers with my limited supplies. Anyone load these with the components I have on hand?
 

DENRIK89

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Joined
Mar 10, 2013
Messages
220
Location
Utah
I think you’re going to have a hard time getting The load with your powder supply but you could load some generic rounds to get you by. I’ve seen imr4831 coming available online quite a bit lot of powder actually if you’re diligent
 

Reelamin

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Joined
Feb 13, 2012
Messages
1,013
Location
West
R4831 has been a great powder with 160's in several 7mm RM I have loaded for. I have two currently I am just starting load development with. I just started last weekend with one and rain kept me from starting the second current one. I only had one factory load 150 Fed and it averaged 2" with three groups. I only was able to shoot two different bullets (168 ABLR, 168 CC), three powders in one weight each (R4831, H1000, R22) before the rain shut us down. Yep, R4831 was the powder used with both bullets. First three loads .8" with the 59.0 R4831, Fed Brass, Fed 215, 168ABLR.
 

Mark37082

Well-Known Member
Joined
Sep 30, 2021
Messages
255
Location
Tennessee
Thanks for the input. The r4831 grouped 5 shots at .8” on two separate groups with the AB160’s. Did not use the chrono on those. I am constantly on the look out for powder. I’ve got a good supply of faster powders for other rifles and handguns, but need slower burning for the 60+hrs in the 7RM. Not sure why I purchased many of the powders I have like the RE17 and VHT150. I guess I will just shoot the 308 until I can find some more suitable powder.
 
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