I use a M4 4.5-14 by 50 M1 LR/T TMR on my Titanium 7mm08 out to 600yrds and a
M4 8.5-25 by 50 LR/T TMR on my 7mmsaum Sendero out to 1500yrds.
Both scopes are extremely clear, have accurate repeatable adjustments and I have had no problems with them to date. They work perfectly to make these rifles truly dual purpose.
Low light transmission is excellent enabling me to make good positive shots on the wily Sika deer we have here in New Zealand.
and the Sendero
Longest shot/kill with the Sendero so far is a hare at 1103yrds and a rabbit at 1151yrds. If there is no wind it can put 5 of hornadys wonderful 162g A-MAXES into a 73mm group at 800yrds. (sealevel elevation, 15 deg celcius.).
You will love the M4.