I have a few of those Gen 1 Razors. They're a nice entry level ELR scope at the cop price. They also weigh as much as a loaded Glock. That Bergara lists 6-48 screws for the scope base. On R700 pattern rifles, even with 8-40 screws I put a 3/16" pin between the rear screws to take the recoil load. Seekins makes a 30 moa base that has a recoil shoulder built into it. Bedding the scope base will help the recoil shoulder work. It's a good idea anyway. A good brake, and you'll want one, makes life easier for you but greatly compounds the problem for the scope base.
I've used Murphy Precision mounts up to 60 moa with that scope. Burris makes rings and a one piece base that use inserts to give up to 40 moa in 5 moa increments. I have my Razors in those but you'll need to dig to find the 35mm versions.
I shot a few of those NorCal ELR matches last year with a 300 PRC RPR using the factory barrel. I have better guns for that but wanted to test the idea of an entry level setup. The gun was competent but not particularly competitive. If you can load decent ammo, you can definitely teach yourself all the things you'll need to know to move up. If you can't load decent ammo, you'll need to figure that out first because a better gun won't help until you do. Decent ammo looks like less than 30 fps extreme spread for 10 shots every time, 1 moa or better for 5 shots every time, using 230 ATips. If you go with HPBT bullets, you'll need to learn to sort bullets. Just skip that to start with. I've had good results with sorted Hornady brass. You'll need to color between the lines on pressure with it though. ADG has been the most impressive, Lapua the least. My come up at that range is 21 mils for the first target at 2050 yards.
If you start with the 1k practices at Sac, the ammo and base recommendations don't really change. You won't need to adjust every bit of travel into the turret for 1K.
If you've adjusted the parallax out of the scope for the current target and there isn't a bunch of vignetting, head position won't affect the POI. I mark the comb posts or put a ring of tape on them to get them back into position if the comb needs to be removed for cleaning. Position the scope so that you're at the back of the eye box and the gun recoils through it rather than out of it at the first movement.
With Hornady bullets, I've had great luck with the Hornady ballistic ap.
