Range Report Is this right? 2600fps 175 SMK?

[Bender]

I worked a load backwards in JBM. Exactly 5.5mil at 708 yards. 175 SMK came out to 2600fps in a 20" 1:10 AAC-SD. 6200 ft elevation, 30 station pressure. 91deg.

The load is 42g H4895 in new IMI match brass LFC die used. Did I do it wrong?

 

[dk17hmr]

Not really sure what you are trying to do. I ran your numbers in "shooter" and came up with 5.8mil to hit 708...5.5 mils for 655 yards....with a 100 yard zero

 

[Bender]

I am trying to figure FPS so I can print a drop chart. I don't have a chrony. I was exactly 5.5 mils at 708 yards measured with bushy 1600 range finder. Just want an accurate drop card.

 

[dk17hmr]

I'm at 2645fps based on 100 yard zero, 6200feet and 5.5...your going to need to shoot a couple different ranges to verify anyways.

 

[djskit]

Sounds about right...you have a good starting point. It will be interesting to see how your range card pans out at other ranges. If you are within a couple of clicks you've done well.

 

[Bender]

You need more information ie scope over bore for anyone to comment semi accurately


Jt

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I left it standard in JBM (1.5 I think). I will measure it and update it.

I guess that would throw off the data. I just thought 2600fps with a mild load (42g) of H4895 seemed kinda fast out of a 20" barrel.

 

[Killswitch Engage]

Scope height very much matters in figuring out dope from programs. You need a spot on zero at 100 and shoot 600-800-900 and 1k if you got it. That will give you true data. I've found stuff inside of 600yds can deceive you at distance.

 

[Tristian19]

Not sure if this means anything.

My DOPE for my CZ 750 .308 says 5.7 MILs when I was at 2400 feet above for 175 SMK's. I was banging steel and recorded for DOPE. Do not recall what size plate was. Probably 18 x 24. Temps were around 80 plus in PA. I was running 4064 @ 2610 or so.

Seems about right to me.

 

[Bender]

Is this right? 2600fps 175 SMK?

Scope height very much matters in figuring out dope from programs. You need a spot on zero at 100 and shoot 600-800-900 and 1k if you got it. That will give you true data. I've found stuff inside of 600yds can deceive you at distance.

Our range only has 708yd max. I will go to the ranch and try 1k to see if it matches. And check scope height.