I'm not trying to hijack your thread, but want to share with you my personal experience.
Had my first custom muzzle loader built this year by Todd South of Southern X-Press Custom Rifles in Mesa AZ. It used the Remington 700 action, Arrowhead 45 caliber barrel, muzzle break, Arrowhead 45 caliber NSR 300 grain bullets, Magnum Large Rifle Primers, and Blackhorn 209 powder. Parts were over 2k.
Took it out and shot clover leafs at 100 yards with 111grains BH209 and Federal Magnum Large Rifle Primers. Lab Radar recorded 2424 ft/sec. Dialed Vortex 6-24x50 Viper with rifle out to 621 yards! Todd was making all the measurements and saved the calculations.
Went on my first muzzle loader hunt near Snow Flake AZ. Winds blew at 15 miles an hour and gusted to 40 mph. Bad year for deer. AZ Game and Fish Officer had told me if you see an antlered deer, shoot it. Don't be picky, you won't get a second chance.
Got lucky and ran across a group of four bucks. We were on a ridge. They were 320 yards away in an open valley grazing on sparse grass.
Todd dialed in the scope while I watched through it with my glasses off tracking the biggest buck. I'm 62 and it was my first none hog hunt since 2006 and first big game hunt since 1994. I had only shot a deer in Utah and a javalina in AZ prior to 2006 and all hunts were at less than 150 yards. All of the hog hunts in Texas were less than 100 yards, with the majority at 50 yards or less in mostly oak covering.
I hesitated. Todd encouraged me. I took the shot.
Todd watched it stagger 30 yards in a half circle and drop. I recovered my senses. 320 yard shot on the money.
Hunt of a lifetime. First time I put in for a hunt. First muzzleloader hunt. Fourth day of my ten day hunt. First attempted take over 150 yards.
Yes, a Remington 700 action for ML works well. I could have gone the more expensive Defiance. But I'm very happy. Extremely happy.
I'm a believer and have a 173 mule deer now as proof.
For the right price, buy it! Then convert it to BH209 and large rifle Magnum primers if allowed in your jurisdiction.