I have a #1B in 6mm Remington with a 1:10 twist. I loaded up some 100 gr flat base that I made using the Corbin system ahead of some VV N-160. I was pleased to see a 3/4 MOA group at 200 yards with only a guess at what I thought might be a decent load.The 243 came at that time with a 10 twist. I suspect you will find it shoots 80 grain or less better. It will not shoot a 95 GR Nosler. Ask me how I know! The 87 V-Max may be your ticket though as you have discovered.
DJ
The length of the bullet is the real key. I too, have loaded 100 GR flat base and shot well. It has become challenging to find those bullets that are happy in that twist for Ruger.I have a #1B in 6mm Remington with a 1:10 twist. I loaded up some 100 gr flat base that I made using the Corbin system ahead of some VV N-160. I was pleased to see a 3/4 MOA group at 200 yards with only a guess at what I thought might be a decent load.
The length of the 100 gr would be substantially shorter than a 95 Nosler.
Boy do I have a deal for you...I’ve clicked on those pics half a dozen times…..
Honestly, I have not shot most of them. The few that I have, I have used the accurized front hangar screw adjustment for slight forearm tension. Dave Sullivan in Colorado did a 257 ACK for me and did his accurizing tricks (the cure). It will consistently shoot one hole groups at 100 yards.DJSBRS, do most of your awesome looking rifles shoot good in stock configuration or have you had to go through some of the accurizing tricks I have read about? Like floating and bedding the barrel or a Hicks accurizer, bedding the rear of the fore-end? I haven't done any of this yet. I've only shot it once since I got it and groups were better than expected but not as good as I was hoping for. But sometimes they never are on the first trip to the range. I know it will take a little work and a lot of luck.
Try springing the hanger away from the barrel (use a padded screwdriver) and insert various thicknesses of metal washers to apply pressure in varying degrees until you have the preferred tension between the hanger and barrel. I've had a few where only a thickness of rubber (think old fashioned garden hose) not only created enough tension tension but also dampened the vibration. I've messed with #1s since my first one in 1972 (mostly 1Bs by choice). Only have 2 now, but have had quite an assortment of calibers over the years. There was only one that I couldn't get to shoot well - Ruger rebarreled it free. They said the barrel had a flaw in the rifling. Way before Teslongs, so I took them at their word.I'm hoping for a load that doesn't require a lot of "tuning". Anything under an inch will serve me well. I had a 6mm Ruger No1 and added the Hicks. I had a drunken gunsmith inlet the fore-end and he made a mess of it. It was a beautiful rifle until he got hold of it. Deep vice marks in the fore-end just ruined it for me. I may just try a wedge of hardwood under the hanger bar first and see how that works out but I have a lot of load work first.
P.S. You have some mighty fine looking No. 1's!!