Good morning all. I will apologize in advance for the lengthy note. Im not experienced enough to make an informed decision on my own so I am looking for some guidance to help point me in the right direction.
I have a new Sendero SFII in 7mmRM that I am working up loads for. I had purchased this new in 2009 and I finally got around to putting a Leupold VX3 4.5x14x50 w/CDS on it this past January. I did a break-in procedure on it (instructions from Wipeout) and I have been working up loads using Sierra Gameking 160 grain spitzer boat tails and Berger 168 VLDs. I have attached a pdf that shows the typical groups I have been getting.
This is the first rifle I have owned that has really given me groups that are consistently around that half inch to three quarter inch range at a 100yds and I dont want to mess it up (thats why Im posting here with my questions).
At the last range session I fired about 25 rounds. At the end of this session my cheek bone was starting to hurt. I also noticed that the recoil causes the rifle to bounce off the bag so much that in the follow thru the target was no longer in my view (barrel typically finishes pointing left and above the target in a 10 or 11 o'clock position).
I have been researching muzzle brakes
and I thought perhaps adding a brake (I was looking at Gentry) would be of benefit to manage the recoil because I really enjoy practice shooting. I had also considered having the stock/action glass bedded at the same time (both items to be done by local smith). My thinking was that the glass bedding could possibly help tighten up groups with the Bergers.
I showed my target groups to a friend of mine and he said that adding a brake or doing bedding could possibly ruin the accuracy by changing the harmonics of the barrel and he recommends that I leave as is (as you know this is easier said than done....this stuff is addicting).
I dont want to do anything that would negatively impact the accuracy potential here. This rifle will be used for elk/deer in Idaho and I would like to work myself up to the point where I can be proficient out to 500 yards.
So Im hoping that folks experienced with muzzlebrakes can chime in and let me know if adding a brake could destroy the accuracy I have. Also based on the groups that Im getting do you think it would be worth it to take it in for glass bedding.
On a side note this rifle really seems to like the Gamekings and RL 19 which is great and I dont think the temperature sensitivity issues would impact much between my home state of Michigan and Idaho but I would really like to shrink down the Berger groups. I will be doing more testing this week with Bergers and H1000 and firing at 200 yards. I will be increasing the powder grains to get more velocity. Both the Bergers and Gamekings seem to like seating at .010 or closer.
Any recommendations on the muzzle brake
and bedding idea (or anything else) is appreciated.