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Discussion Starter · #1 ·
I'm looking to load my mark2 m77 with hornady 154 sst. I've tried several combinations with IMR 4831, IMR 4350 and RL 25 and my rifle shoots best groups with factory ammo so far. I have floated the barrel and that did make a huge difference in accuracy consistency but not with hand loads.
I've got Remington brass, Remington 9-1/2 primers for magnum and the three powders listed.
For what it's worth, I have found that the old mans .30-06 shoots 168 grains into .125 groups with 55 grains of IMR 4350, CCI BR-2 primer with a Remington ADL.
Any help for the 7mm in a ruger mark2 m77 is much appreciated.
 

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Discussion Starter · #2 ·
Mmm....
Any help with this really is appreciated. Here is a picture of 6 rounds at 100 yards with Winchester 150 gr. and Remington 175 gr. factory loads. I had a flyer with each. ( most likely my fault they are so far apart, compared too the 4 shot group).
Tableware Automotive tire Rim Circle Gas


This Ruger is capable of great accuracy as seen in the target. But loading these 154 sst bullets is beginning to get expensive. So far I have found
( according to my Hornady 9th and Lyman book)
That 2800 fps and less causes the round to tumble instead of fly strait. I've got the bullet stable with RL 25 at 70 gr but according to these sources I'm close to exceeding maximum pressure, although I have no sign of excessive pressure yet. I've loaded another 6 rounds now and when weather permits ill try them out. 3 at 72 gr and 3 at 73 gr.
Agin, any info for these rounds and a mark2 m77 is much appreciated.
 

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