I have some 175's but haven't tried them yet but have worked up loads for three of my 7 Mags with the 168 LRAB.
The first is a 40-XB that I use if hunting over a cut-over bought used off of GB. Two series with Retumbo and H-4831.
Retumbo gave four shot groups were as follows: 0.85, 0.8, 0.95, 1.2 and 0.6. Later, five shots with the best load were in 0.45. Another five shot group at a later date was 0.6. Three shots on another day were 0.55 and three shots at 200 yds were 0.3.
H-4831SC gave four shot groups of: 1.3, 0.85, 0.4, 1.3, 1.1. Later, five shots of the best load were in 1.2. Another five shot group later was 0.75.
A 700 CDL with a 26" fluted barrel hasn't done as well. First four shot groups with Retumbo were 2.8, 3.0, 1.25, 2.1, 3.05. In a seating depth test, I got 2.9, 0.75, 2.35, 2.35, 2.25 and 1.8. I tried another seating depth trial to confirm the earlier results of the best and four shot groups were in 2.5, 1.7 and 0.75.
The last rifle is 700 African Plains Rifle from the Custom Shop bought used off of GB. First attempts were with Retumbo based on results with the 40-XB. Four shot groups were 0.65, 0.6, 0.8 and 0.8. Later, three shot groups were in 0.35, 0.45, 0.25, 0.5, 0.4 and at 280 yards in 1.4 and 2.1. A couple of weeks ago I was doing some last minute sight checking before an elk hunt and got the following: at 100 yards, three in 0.6 and three in 1.1 at 280 yards. The following week, at 100 yards three in 1.0 and at 280 yards four were in 2.0.
As to the ballistic coefficients I can't answer but based simply on "Ballistic" I-pad app my point of impacts at 100 and 280 yards they were right. I KNOW....280 yards is not a really a valid test but that's what I got and haven't been able to stretch 'em out.
As with any other components, you never know 'til you try them yourself but two out of three of my 7Mags like 'em a lot.
