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7 LRM and alternative powders

 
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  #1  
Old 04-13-2014, 01:34 PM
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7 LRM and alternative powders

I recently had a 7 LRM built by s local Smith here in Tucson, az. I have read everything I could get my mouse on, all signs obviously pointing to H1000. Luckily, I have about 5# on hand. I have only been able to fire 5 rounds though my gun. So far, it appears 70-71 grains will be my max, (175 LRAB).

Azshooter and I have been in constant communication about different powders to try.. he was even nice enough to sell me some.

So, other then H1000 what powder choices do I have? For this rifle, I have on hand h1000, US 869, Retumbo (scored 2# yesterday), RL 33, 25 & 22.
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77" coues buck, last day 571 yards. .257 Wby. 115 VLD
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Old 04-13-2014, 07:31 PM
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Re: 7 LRM and alternative powders

One thing that could/will help dictate what powers to use is your barrel length. The shorter barrels usually do better with a faster burning powder (H4831SC for your LRM) and longer barrels with slower powders (Retumbo). If you fall somewhere in the middle, pick a couple and shoot and see which one/ones your rifle likes. Good luck and keep us posted to your progress.
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Old 04-13-2014, 09:31 PM
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Re: 7 LRM and alternative powders

My rifle has a 26" 1/9 #4 fluted Brux.
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77" coues buck, last day 571 yards. .257 Wby. 115 VLD
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Old 04-19-2014, 09:44 PM
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Re: 7 LRM and alternative powders

Anyone?
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77" coues buck, last day 571 yards. .257 Wby. 115 VLD
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Old 04-20-2014, 03:24 PM
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Re: 7 LRM and alternative powders

I just tried H1000 for mine and it worked great. I only tried Fed 215m's and the 180VLD's...got lucky there too. Gunwerks smithed my action and barrel when the 7LRM was just comming out. The reamer they used requires me to turn the necks and use a .020-.025 jump to the lands with the 180VLD. Neck tension is .002. During load development it never shot over 1.25" at 200 yrds and shoots less than 3/4" at 200yds now. To say I'm extremely pleased is an understatement.
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180VLD's@3145fps. with 72.8grs. of H1000, 215m primer
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  #6  
Old 04-20-2014, 04:45 PM
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Re: 7 LRM and alternative powders

Moombaskier,

First I have heard of neck turning with this cartridge. What neck wall thickness did you have and what thickness did you end up with?

I necked down the 375 Ruger and neck turning was part of the process before I ordered the reamer.
Neck wall thickness is .013" . Also using .002" neck tension.

Thanks!
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Old 04-23-2014, 07:44 PM
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Re: 7 LRM and alternative powders

I was finally able to go shoot on paper today! My first group on paper ever with this gun was sub moa. 81 grains of US869 produced this group with the 175 LRAB @ 100.



I had a poor rest, and the wind was blowing pretty good so I'm sure I can get that third shot to touch the others with our to much issue.
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77" coues buck, last day 571 yards. .257 Wby. 115 VLD
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