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200gr Muzzle velocity

28 Sep 2020
@ 10:46 am (GMT)

Matthew Morrison

Just finished my last target shoot and ready for hunt. Am drawn for Cow Moose (Alberta) Hooray!!
I am seeing some subtle pressure sign with my load set up and just want a little reassurance
Brass Hornady
Powder H1000 at 76.5 gr
Bullet( here is the crux) An AlCO Match 200gr with a claimed G1 Coefficient of about 0.800. ( I have the last three boxed of 200 gr that AlCO made Now only 190 and 210 avail so I averaged the G1's)
My first shot was 2980 FPS. After warm up they were all around 3015-3020 FPS.
I'm shooting a Custom made (locally in Edmonton) Remington Long with a 26 inch 12-10 5R Gain Twist barrel. The Jump is 10-12 thou.

So, this morning at 550 yards I was shooting 12 inches high using my Kestrel with that G1 and that weight and those FPD muzzle velocities. The adjustment was 7.2 MOA by the calculator.

I've been reading standard Muzzle velocities achievable / expected for 200 gr bullets in similar guns and 3020 is FAST. I'm not going to change anything this year as I have no more weekends to practice and adjust.(and am wearing out a Framer friend's welcome. )

So... If I have to make a 4-500 years shot in three weeks how much adjustment down would be recommended on the MOA to reduce the error and make a good kill?

yours
Matt Morrison Northern Alberta

Replies

28 Sep 2020
@ 10:53 am (GMT)

Matthew Morrison

Re: 200gr Muzzle velocity
Sorry bout the typos Dam AUTO CORRECT
28 Sep 2020
@ 11:00 am (GMT)

Ed Sybert

Re: 200gr Muzzle velocity
Matt: I'm sure you meant to mention what caliber you're loading for. Perhaps I missed it. -Ed
28 Sep 2020
@ 11:31 am (GMT)

Matthew Morrison

Re: 200gr Muzzle velocity
Remington 300 WM
28 Sep 2020
@ 12:11 pm (GMT)

Nathan Foster

Re: 200gr Muzzle velocity
Hi Matt, OK, will just go through a few checks and let you mull them over. Not going to critique the load but as you say, you will need to re-address pressure at some stage.

Maybe try to avoid a bipod, variable too much for you to deal with at this point.

At the range, obtain your zero then dial up 20 MOA and fire a few shots to check that the turret is true.

After bench target work, be sure to obtain your field zero at the same 100 yards, but from your field position. In other words, the POI over sand bags will differ to POI prone pack / bipod. Use two hands as you have already read in the book series.

Set the rifle to print 2.5 or 3" high at 100. In your app, set the zero range 100, zero height 2.5 or 3 inches.

Make sure sight height input is correct (scope height).

Your method for obtaining the G1 sounds fair and the G1 model should be fine to your intended ranges. You might however want to email Alco and ask for their take on the BC incase the overall design is a bit different.

If you want one of us to check your math from the previous session, we need more inputs:

Sight height ?
Zero range ?
Zero height ?
BC .8
MV 3017 though you may get into colder conditions yet so may have to go 3000fps to hedge bets based on numbers you have given.

Okeydokey, see how you get on with that.





28 Sep 2020
@ 12:15 pm (GMT)

Nathan Foster

Re: 200gr Muzzle velocity
You may as well add your altitude while you are at it. It won't amount to 12" but it will help a bit. Angle will also be needed if back working your previous session.
28 Sep 2020
@ 12:16 pm (GMT)

Matthew Morrison

Re: 200gr Muzzle velocity
https://drive.google.com/drive/folders/1wun-dxQd2qOp2t9rWJ3nDxZli4Wpp17I?usp=sharing
28 Sep 2020
@ 12:18 pm (GMT)

Matthew Morrison

Re: 200gr Muzzle velocity
Altitude? 1900 ft ASL And I was shooting down hill abut 60-70 feet over 550 ft[b]
28 Sep 2020
@ 12:21 pm (GMT)

Matthew Morrison

Re: 200gr Muzzle velocity
One more correction:
Muzzle velocity was 3035 Not 3010-15

Matt
28 Sep 2020
@ 12:22 pm (GMT)

Nathan Foster

Re: 200gr Muzzle velocity
You'll need to set that folder to share - anyone with the link.
28 Sep 2020
@ 12:29 pm (GMT)

Nathan Foster

Re: 200gr Muzzle velocity
Still can't open it sorry Matt.
28 Sep 2020
@ 01:03 pm (GMT)

Nathan Foster

Re: 200gr Muzzle velocity
Today we lose a dear friend. Matt was in the middle of writing a post to friends, enjoying his favorite topic when we was suddenly and viciously attacked by a stray Moose.

This has left us all with many unanswered questions. What was his scope height? how did the Moose get into his house? Why did police not listen to the psychic investigator who predicted this weeks before the event?
28 Sep 2020
@ 01:45 pm (GMT)

Matthew Morrison

Re: 200gr Muzzle velocity
Alright Alright I was eating supper. And before that I was cleaning house for my wife.

that link should be open now

https://drive.google.com/drive/folders/1wun-dxQd2qOp2t9rWJ3nDxZli4Wpp17I?usp=sharing

No Bi or TriPod
Just the good ol belly knee and elbows on ground Double wrap "Hold That Forehand" No Hand Sandwich, Very relaxed and could have held the cross hairs on target for 5 minutes no problem

Night force scope 1.77 in Height
Zero range and height at 100 Yards is zero
MV 3035 (not 3015 as I had said earlier)

And please critique
I may not be much but I'm all I think about so I do enjoy getting knocked around a bit. Good for the soul
28 Sep 2020
@ 01:51 pm (GMT)

Matthew Morrison

Re: 200gr Muzzle velocity
Last correction 529 yards not 550. My Christ i can't get my facts straight.
28 Sep 2020
@ 02:32 pm (GMT)

Nathan Foster

Re: 200gr Muzzle velocity
Ha, fun to stir...

OK, at .177 height, 100 yard zero, 3035, Alt 1900ft, Sierra says 8.2 while shooter says 8.3. Either way its dial up 8 MOA plus one click for 550 yards.

So basically this is merely adding confusion to matters.

At 12 inches of extra height at 550 yards, you have somehow gained just over 2 MOA or two extra inches height at 100 yards.

So what we are looking for is something dramatic, a major change in POI. I am really sorry Matt but you may have to pull the target back to 100 and see if the farmer will put up with you for a bit longer.

Further checks:

Just check to make sure the base is glued and the rings are OK. I know its a silly thing but it does catch folk out more often than expected.

If the bore is not fouling heavily, I want you to back off cleaning other than a quick wipe in with CRC-350 and then a quick dry wipe before you take the rifle out to shoot it.

If the copper fouling is really heavy, then this may need to be solved before getting too much further along (continue break in methods).

Otherwise, I cannot see anything obvious. Primers look OK just for now but the brass will take a hammering, range looked good, wife's chef hat looked fine.

It would be rare for NF to cock up the turrets. Even if the scope was miscalibrated, a factor of 1.5 is high unless perhaps it is a mil thread pitch. In any case, you may still have to check the turret travel at 100 yards if nothing else is evident.

Not much help sorry, it is hard to help in some matters via correspondence.

In any case, do not add a correction factor or come down 2 MOA and reset the turrets. Nor is it worth altering the BC. Instead, you will need to go back and shoot at 100 yards sorry and perhjaps also dial up at this range. You need this foundation type info to help reduce variables.
28 Sep 2020
@ 04:07 pm (GMT)

Matthew Morrison

Re: 200gr Muzzle velocity
Yes I have been augering down to this notion this afternoon. No Not too much copper. Good bit of fouling after 12 shots this afternoon. Rings are tight. tMOA thread pitch

I do sure appreciate you framing it up nice and succinct. I will go back to 100 yards
I will keep the 76.5 gr H1000 and the 3035 MV.
I'll let yah know how it goes:

https://drive.google.com/drive/folders/1p6aoviLe2HZsVUmMx2DgVCrD_DvQX0lM?usp=sharing
28 Sep 2020
@ 04:17 pm (GMT)

Scott Struif

Re: 200gr Muzzle velocity
Hi Matt. If you have OnXHunt, GaiGPS, or a Garmin, you might be able to verify the altitude difference between you and your target. Maybe try using a soft pack or bag stuffed with towels as a rest. Shooting prone without a rest at that range is not something I could pull off. Maybe you can. If you fill your tag, be sure and post pics. Good luck!
 

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