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+--- Thread: Ballistics question for surplus optic (/showthread.php?tid=24749)
Ballistics question for surplus optic - Stephen Vick - 07-26-2022
Good morning: I am new to this forum but am looking for wisdom on an optic I recently traded for. Its an Elcan M145 with the 240 Bravo reticle with range finding up to 1200 M. I have found some videos of guys who have put them on 5.56 ARs but I have one in a 6.5 Grendel with a 20 inch barrel. I have heard the ballistics are similar with a .308. Has anyone on the forum had any experience and advice they could give on if using the BDC if it would be the same. I know on ARs its different. What would be a good distance to zero it from? Anyway I hope everyone is doing well and as I said I'm new and this is my first post on this forum. I have used THR but after hearing this forum was about the Grendel I thought this was probably the best place to seek wisdom.
Ballistics question for surplus optic - VASCAR2 - 07-26-2022
Welcome to the forum Stephen. There have been several threads discussing using a 308 ballistic drop reticle for the 6.5 Grendel. You can use the google custom search feature to find threads on a similar topic. Im not familiar with that specific Elcan but most others are 1x or 4x. Id zero at 50 or 100 yards then see how close I was on at 200 or 300 and then adjust. If the Elcan only has 4x then I suspect it will work pretty well out to a few hundred yards. The 4x would limit my ability on anything but shooting steel past 200-300 yards.
Here is a link discussing the 308 ballistics in comparison to the 6.5 Grendel. This might help answer a couple questions.
https://www.65grendel.com/forum/showthread.php?24800-Hey-guys-I-have-a-question-about-scopes!
Here is a link to the google custom search.
https://cse.google.com/cse?cx=016368947416500061353:paqd_0xcu1o&hl=en
Ballistics question for surplus optic - sundowner - 07-26-2022
Welcome to the horde from Wisconsin .
Ballistics question for surplus optic - just_john - 07-27-2022
Welcome to the clan, SV, from the great nation of Texas! Tell us a bit about your goals and your builds.
Ballistics question for surplus optic - Stephen Vick - 07-27-2022
I am an amature at best but have built a few over the years going back to the late 80s. I liked what I read about the Grendel from its history in Iraq and I have an Olympic SGW with a 24 inch SS match barrel in 5.56 an old Navey UDT guy who taught me to build as my first in 1989. It has been a tack driver but I wanted something with some more range for the same platform. Between working all the time as a clinician slash LEO and raising a family I don't get to devote as much time nor money to my hobby but this Optic came up and I couldn't resist. I am looking forward to learning from you fellows all that I can and thanks for having me on this forum.
Ballistics question for surplus optic - Stephen Vick - 07-27-2022
Thank you and I look forward to garnering some knowledge. I am really very new to the Grendel but I enjoy shooting it when I can.
Ballistics question for surplus optic - Stephen Vick - 07-27-2022
Thank you, sir, for your reply, and I really appreciate the link. I will check it out.
Ballistics question for surplus optic - LRRPF52 - 07-28-2022
Welcome aboard!
We used to have those M145 MGOs on our M240s. Theyre calibrated for high hit probability with short bursts of fire.
You just have to work out your drop and correlate it to the reticle stadia, depending on the conditions where you are. With 123gr ELD-M from a 20 Grendel, the close range drop stadia will be easy to match up.
The 10m zero probably wont work because the Elcan was mounted on top of the feed tray cover on a rail on the M240B, with pretty significant height over bore.
Zeroing it will be your first challenge.
Ballistics question for surplus optic - Stephen Vick - 07-29-2022
Thanks for the Info on the Elcan Did you have many problems with it holding zero in the field? I am not keen on the friction mount but a replacement to the 2 nut version that was issued on the M4 variant is like 500.00 from the company. I will probably try something like 50 yards to get it close I have a pretty good set up on my farm to zero but I can easily go out to 100 but I don't have great vision and I will struggle with the 4 power magnification. I have a new rubber cover on its way as mine is pretty beat up I just dread changing the thing as it fits very snug.
Ballistics question for surplus optic - LR1955 - 07-29-2022
To add to this, my last time with a 145 was fifteen years ago when we had to use some on the M-4 for a SDM course I was running.
Huge PITA to zero because the elevation and windage knobs were crude at best and indexed about one minute per click. Good enough for issued M-4's and issued ball ammo.
I had the guys get a 25M zero using the 300M stadia to get it close enough on paper then did the real zero at 300 using the 300 Stadia. Come ups between 300 and 500 are really close between the issued Green Tip and issued M-80 Ball so if the guy had a really centered up (relative terms) zero at 300, he could hold a upper torso at 500 -- somewhere.
Anytime you are working with a 3.5X optic using a Xmas Tree reticle shooting ball ammo from service grade weapons, shots past 300 are dodgy.
They worked but honestly, as a civilian, go with something better. Those things are way overpriced for a heavy and bulky low power optic with really crude adjustments.
LR-55
Ballistics question for surplus optic - Stephen Vick - 08-03-2022
Thanks for the info. I will take it in consideration when it cools down enough to zero it in.