Scopes and Sights Discuss firearm scopes, sights and related accessories here.

Explain this, .45-70

Old 09-02-2017, 11:24 PM
  #1  
Super Moderator
Thread Starter
 
Bocajnala's Avatar
 
Join Date: Dec 2006
Location: Trumbull County, Ohio
Posts: 7,832
Default Explain this, .45-70

Ok, mounted a Bushnell Elite 3500 on my marlin 1895. This will be my primary deer rifle for Ohio now since straight walled cartridges were legalized...


Shot it in today. Started out with the leverevolution 325gr.


First, I took two shots at 25 yards to see where I was at. They were touching, and inch low. Good, this should be easy.


Moved back to 100 yards and shot a 3 shot group. Nice group. 9" low. Adjusted scope up 10"


This group was right where I wanted it and about 1.5". Pretty happy with that.


Then I shot groups with two other brands of ammo. All hit within 3" of each other. I was happy with that as well. Then I shot a 6" steel gong I have hanging up. It's fun shooting steel with the .45-70.


Alright, now for the question...


Rememember, there was about an 8" difference between my first 2 shots at 25 yards, and my first 100 yard group. So, I went back to 25 yards, and shot three more shots to see where I was hitting up close.


All shots were touching, about an inch below center... So, what happened to that 8" between the first 25 yards and the first 100 yards?


This rifle is shooting good, and handles nice. I think I'll really enjoy hunting with it this year. Just wondering what happened to that 8" I adjusted for.


-Jake
Bocajnala is offline  
Old 09-03-2017, 03:07 AM
  #2  
Boone & Crockett
 
Oldtimr's Avatar
 
Join Date: Jul 2014
Location: south eastern PA
Posts: 12,925
Default

I shoot the 325 grn Hornady LE out of my 45-70 Marlin Guide gun. I shoot for center at 25 yards, I get nowhere near an 8 inch drop between 25 yards and 100 yards, I get around 2 1/2 to 3 inches. Something is strange with a 10 inch elevation adjustment at 100 and little change at 25 yards as well as dropping 8 inches at 100 yards the first time around.
Oldtimr is offline  
Old 09-03-2017, 04:01 AM
  #3  
Super Moderator
Thread Starter
 
Bocajnala's Avatar
 
Join Date: Dec 2006
Location: Trumbull County, Ohio
Posts: 7,832
Default

Yes, the first time is what is throwing me off. When I saw the initial 8" drop I checked all of my mounts, because I thought something had moved. But, it hadn't, everything was tight. And the subsequent groups confirmed everything was tight.


When I went back to 25 yards I expected there to be a significant difference (Because I had adjusted for the drop in the scope, so the 25 yard POI should have changed as well.) but there was no significant difference.


I put around 40 rds through it. Everything shot and grouped fine. Just strange how that happened.


-Jake
Bocajnala is offline  
Old 09-03-2017, 04:02 AM
  #4  
Super Moderator
Thread Starter
 
Bocajnala's Avatar
 
Join Date: Dec 2006
Location: Trumbull County, Ohio
Posts: 7,832
Default

Originally Posted by Oldtimr View Post
I shoot the 325 grn Hornady LE out of my 45-70 Marlin Guide gun. I shoot for center at 25 yards, I get nowhere near an 8 inch drop between 25 yards and 100 yards, I get around 2 1/2 to 3 inches. Something is strange with a 10 inch elevation adjustment at 100 and little change at 25 yards as well as dropping 8 inches at 100 yards the first time around.


Do you like the LE ammo? Have you got to use it on deer yet? I've used it in the .44 mag and it did well. I think I'll stick with it for this season. It had the tightest group out of all the ammo I tried. Next year I'll be handloading for it and will work up a load next offseason.
-jake
Bocajnala is offline  
Old 09-03-2017, 05:25 AM
  #5  
Boone & Crockett
 
Oldtimr's Avatar
 
Join Date: Jul 2014
Location: south eastern PA
Posts: 12,925
Default

Yes I like it, I have killed 8 wild boar with it and four deer. With behind the shoulder shots on deer, in the crease it makes small pieces out of the heart and lungs, basically, the chest cavity is soup. One of the last two hogs I killed a 153 pounder, with the ammo was shot right on the shoulder because I was running out of daylight, I always go for a head or neck shot but since the light was really bad I took the biggest target and went for right behind the shoulder. When I shot, down he went, a few kicks and it was over, the bullet went through, came out and killed a small hog, about 25 lbs standing directly behind it that I could not see. Strange thing was the entry and exit wounds were in exactly the same place on both hogs, the bullet entered at the crease behind the shoulder and exited the shoulder on the other side. Had I been on the ground instead of about 6 feet up in a stand, I would have shot right over the little one. I felt bad about it, but he ate pretty well roasted whole. I think you will like those rounds. Here is the piggy.



Here is the pass through victim.

Last edited by Oldtimr; 09-03-2017 at 06:57 AM.
Oldtimr is offline  
Old 09-03-2017, 06:21 AM
  #6  
Boone & Crockett
 
bronko22000's Avatar
 
Join Date: Jan 2004
Location: Eastern PA
Posts: 11,711
Default

I love the old .45-70 Jake. I have a few. Not exactly sure what the velocity of your LE ammo is I took a wild guess. And punching the numbers into a ballistic calculator I bet it you have your rifle set up for a 50 yard zero.
This is assuming your sight height is at 1.5". The 325 LE has a BC of .230 and I guessed the velocity to be about 1800 fps.
Actually with this ammo you should have been 1.4 high at 25 and 1.6 high at 100.
I sight my 45-70 dead on at 100 because I rarely get a shot beyond that.

Last edited by bronko22000; 09-03-2017 at 06:26 AM.
bronko22000 is offline  
Old 09-03-2017, 06:51 AM
  #7  
Nontypical Buck
 
Join Date: Feb 2003
Location: Eastern wv
Posts: 2,640
Default

were you on the same magnification both times you shot at 25?
RR
Ridge Runner is offline  
Old 09-03-2017, 06:58 AM
  #8  
Boone & Crockett
 
Oldtimr's Avatar
 
Join Date: Jul 2014
Location: south eastern PA
Posts: 12,925
Default

I was going to asked the same question RR.
Oldtimr is offline  
Old 09-03-2017, 08:55 AM
  #9  
Super Moderator
Thread Starter
 
Bocajnala's Avatar
 
Join Date: Dec 2006
Location: Trumbull County, Ohio
Posts: 7,832
Default

Originally Posted by Ridge Runner View Post
were you on the same magnification both times you shot at 25?
RR


Ah. That may be it.


I figured it would be something dumb that I would realize after it was said. I'll check that out tomorrow.


Off the top of my head I think I was, but that could definitely be it.


I'll find out tomorrow and report back.
-Jake
Bocajnala is offline  
Old 09-03-2017, 05:02 PM
  #10  
Super Moderator
Thread Starter
 
Bocajnala's Avatar
 
Join Date: Dec 2006
Location: Trumbull County, Ohio
Posts: 7,832
Default

To clarify for tomorrow, I should sight in on 9x , then go back through and shoot at various powers to confirm POI. That correct?

Thanks for the help, enjoy the holiday tomorrow
-JaKe
Bocajnala is offline  

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.