I am in the process of working up some 7MM RM Mag Loads (160GR AB, 66GR RL25, +/- 2931fps) that I intend to use this year for elk. I have a low profile 10x Leupold VX3 mounted atop a Browning x Bolt 7mm. I have and have figured out the overall length that gives me the tightest group at 100yds (sub MOA) and finally took the gun to the 200 and 300 yard range last night. I have the scope right on at 100yards, at 200 yards it was shooting about 4 inches low and at 300 yards it was shooting about 14inches low......for final adjustments I have always set my scopes to shoot about 2.5in high at 100 yards but would like some input from those smarter than I...I would like to be able to maximize the range the load is capable of....should I be at 2.5in, 3in high....to get out to 300 yards and hold dead on?
Help with Trajectory 7MM RM
- Thread starter VPETERSO
- Start date
2.5" high at 100 yards will have you zero'ed at roughly 250 yards and 3.6" low at 300 yards and 15.3 inches low at 400 yards. 2.5" high at 100 yards is good to go with, but be careful that you are 3.9" high at 150 yards. That is the highest point of your bullet flight. :grin: :grin:
Well I was in that same school of thought until two weeks ago.
I'm shooting a Savage 110 Tactical with a 24 inch bull barrel.
Load is 65 grs RL22,160 AB and a Fed 215 Match Primer.
It chronos 3170 ten feet off the muzzle and shoots three shot groups in the 1/4 to 1/2 inch size.
I zeroed it 2.5 inches high at 100 and then shot it at 200 off of sandbags.
The gun shot a 3 round group that was right at an inch but it was almost 4 inches above point of aim.
Stunned I had my buddy shoot it,same results.
I've always zeroed 1.5 to 2.5 high at 100 and it has always worked for me until now.
Due to the ballistic co-efficient and velocity of the 160 AB in the 7Rem Mag I would suggest you ZERO the gun at 200 yards.
Howard
I'm shooting a Savage 110 Tactical with a 24 inch bull barrel.
Load is 65 grs RL22,160 AB and a Fed 215 Match Primer.
It chronos 3170 ten feet off the muzzle and shoots three shot groups in the 1/4 to 1/2 inch size.
I zeroed it 2.5 inches high at 100 and then shot it at 200 off of sandbags.
The gun shot a 3 round group that was right at an inch but it was almost 4 inches above point of aim.
Stunned I had my buddy shoot it,same results.
I've always zeroed 1.5 to 2.5 high at 100 and it has always worked for me until now.
Due to the ballistic co-efficient and velocity of the 160 AB in the 7Rem Mag I would suggest you ZERO the gun at 200 yards.
Howard
You will probably really be shooting much flatter than a lot of book ballistic charts give you. I always sight everything 3 inches high at 100 yards. With your load I would be willing to bet with a 3" high at 100 zero that you will be closer to 3.5" high at 200 and about on the money at 300 and only right at 10" low at 400 yards. Remember an elk has a pretty large kill zone compared to a deer. I would sight in 3" high at 100 and see where you hit at 200 and 300 and figure from there. A point blank hold in the center of the kill zone out to 350 yards and a top of the shoulders still in the hair out to 500 ought to get it done. You will not know for sure until you shoot at those yardages so practice.
If you are like me you will spend all that time working on long range stuff and you will have one run over you inside 50 yards :mrgreen: . Good luck and good shooting.
If you are like me you will spend all that time working on long range stuff and you will have one run over you inside 50 yards :mrgreen: . Good luck and good shooting.
I never sight in higher than about 1" to 1.5" high at 100 yards... this means that with most "flat shooting" (3100-3400fps)rifles I'm about 6" low at 300 and 12"-15" low at 400. When stuff is far away... you hold high... it's automatic. Of all the critters I've missed in my life... and seen other folks miss... about 9 times in 10 the shot misses HIGH... even at 300-400 yards.
- Nov 4, 2004
- 24,915
- 7,816
Use this link...
http://www.biggameinfo.com/
Click on Ballistic Calculator, Advanced Ballistic Calculator and plug in your data.
JD338
http://www.biggameinfo.com/
Click on Ballistic Calculator, Advanced Ballistic Calculator and plug in your data.
JD338
Guy Miner
Master Loader
- Apr 6, 2006
- 17,656
- 5,435
With a flat-shooting cartridge like a 7mm Rem mag, I typically zero the rifle at 300 yards, and find it's only 9" low or so out at 400 yards.
This makes for "hold on hair" from the muzzle out to 400 yards - and really takes the guesswork out of placing a killing shot to nearly a quarter mile. Good enough for me.
A fellow does need to understand that it's going to shoot a few inches high at 100 & 200 yards, I've seen guys make spine hits when they were hoping for a low chest shot at those ranges. Spine hits work just fine though.
Guy
This makes for "hold on hair" from the muzzle out to 400 yards - and really takes the guesswork out of placing a killing shot to nearly a quarter mile. Good enough for me.
A fellow does need to understand that it's going to shoot a few inches high at 100 & 200 yards, I've seen guys make spine hits when they were hoping for a low chest shot at those ranges. Spine hits work just fine though.
Guy
- Nov 4, 2004
- 24,915
- 7,816
Here is a rough idea based on Big Game Info's Ballistic Calculator...
7mm RM 160 gr AB MV 2930 fps
50 1.1
100 2.6
150 3.0
200 2.2
250 0.0
300 -3.6
350 -8.6
400 -15.2
450 -23.6
500 -33.8
Keep in mind that elevation and temperature will have some effect on this.
JD338
7mm RM 160 gr AB MV 2930 fps
50 1.1
100 2.6
150 3.0
200 2.2
250 0.0
300 -3.6
350 -8.6
400 -15.2
450 -23.6
500 -33.8
Keep in mind that elevation and temperature will have some effect on this.
JD338
- Oct 30, 2004
- 24,187
- 2,829
I always found 2.5 " high at 100 worked really well with just about every big game round I own. Be sure you measure from the center of the group! Even my 300 Wby with 180's at 3250 likes this sighting and my 7MM Mags all do too. For me 3 " is too much with a flat shooting magnum and maybe 2 1/4 " is better, but 2.5 always works!
Antelope_Sniper
Handloader
- Jan 25, 2008
- 2,618
- 0
If you don't have M1 target knobs, 2-2.5" high at 100 yards is usually a good place to set you trajetory for all the reasons mentioned.
- Thread starter
- #13
