Hi guys,
New to long range shooting. I have done lots of shooting and deer hunting in the 50 to 350 range, but recently decided to get a 6.5 creedmoor bolt rifle to play with long range. The only other long range shooting I have done is at 1000 yards with a buddies .338LM, and it was like an easy button....we literally just guessed a velocity, entered it into a ballistic app (after watching magpul art of the precision rifle) and made hits. That was years ago and haven't done it since. My rifle is a 20" 10fcp-sr in 6.5 creedmoor, wears a silencerco hybrid (sounds amazing by the way), and a steiner t5xi 5-25 (with the upgrade), burris xtr rings with 20moa inserts, with a 20moa rail.
Anyways, I was shooting at 500 and 600 yards at my 12x20 silhouette the other day (the most I could get on this ranch, without having to hike up a mountain carrying my target), and my dope from both JBM and Shooter app showed me at 3.2 mils and 4.3 mils for 500/600 yards, yet I had to dial down to 2.7 and 3.8 mils to make center hits on the target. I am at around 4800 elevation, and it was around 98 degrees (I don't have the pleasure of a real range or anything, so I actually was laying on my mat, on a rocky road, in 100 degree weather to get the opportunity to shoot, put on long sleeve shirt so my elbows would stop burning on the mat) that day. When I change my normal inputs to the hot summer day input, it only subtracts .1 mils from each dope callout. Before I shot one of the arms on my chronograph, I averaged 2620 from my 20" barrel (without the suppressor, didn't get to chrono with it) with hornady black 140gr bthp (not sure if this is the same 140bthp listed in bullet libraries). I thought that might be the issue, increased velocity from the can, but it looks like I have to hit 2800 or so to make it match my dope. To make sure it wasn't mind games, I dialed to the dope in my app and would hit just below the target. Dialed back up and made center hits.
Any ideas to check before setting up box tests and all that? I don't have anywhere to shoot with a bench and real range to make that easy to do.
I could consistently make hits, center of my steel, holding .5 windage, and the previously mentioned dope.
Not ruling out a psychosis from the heat. Boy it gets hot in the desert.
Thanks for the advice for a new guy.
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