I would like to find someone to alternate with as shooter and spotter.

When are you thinking of going? I need to try and program an eliminator 3 scope and have to check calibration at 750 yards and could use a good spotter.

I am going to the new member orientation on Saturday September 5th and plan to stay afterwards to shoot.

Other than that I can shoot during the week when I am in town and Saturdays usually work.

I was at the BR&PC yesterday and have been there several times recently.

Still looking for someone that wants to shoot/spot.

Did you find your magic cartridge?

I did but it is not suitable for the AR-15 platform.

To get the velocities I wanted required a case diameter that looked to exceed what could be safely put in a barrel the size of that in an AR-15.

I searched for and seemed to have found the bullet that will have the least wind deflection at 300 meters in my rifle and for the time being will shoot the 200 and 300 meter targets. !6", 1/9 twist on an AR-15.

I did some chrono work Friday. I was able to push a Hornady 68 gr Match BTHP to 2,863 which would have a little less than 14" of wind deflection per 10 MPH at 300 meters. That is pretty much fast enough but I will do some more shooting to find a load with better ES and SD numbers. That was with TAC, I will also try some CFE223.

I will probably build a bolt action Silhouette rifle in the spring with a 6.5-250 Ackley Improved cartridge that will meet the NRA Rifle Silhouette rules. An AR-10 is not really th right way to go and you are not permitted to use the mag as a hand rest. That should have about 8" or so of wind deflection per 10 MPH at 300 meters and enough energy/momentum to knock down the Rams at 500 meters.

Until then I will shoot what I have for fun and practice.

Wanna shoot?

What about a 6x6.8 or 22x6.8

What would be the wind deflection at 300 meters with a 10 MPH wind at 90 degrees?

Honestly don't know. Guess that would all be subject to the BC of the bullet used and velocity at which it is being pushed. I'm not well versed in this sort of thing but thought the cartridges I mentioned might be worth looking into especially if you are wanting to build on an AR platform.

I have a friend with a 20" 8 twist 22x6.8
Here are some velocities that he is getting. Dont know if this will help you any.
50 gr noslers and 69 gr sierras. the 69 grainers shot the best at around 3k. the 50 nosler bk's shot around 3300

Might be headed out to the BR&PC Silhouette range tomorrow or Tuesday.

I have a new scope and will be heading out to the Silhouette range to get it sighted in.

The Leupold 24X works great. Got a decent Hornady 68 gr HPBT load working. Planning to head out to the Silhouette range Friday morning.