trajectory question, 45-70

[Oklahoma Rebel]

I am shooting a 22" marlin 1895 45-70 with noe 430gr rnfp's going appx. 1400 fps @32.4 grs. imr4198. unfortunately I have no chronograph. I was just wondering if any of you had a load close to mine and knew the trajectory. I am getting a 3X scope before gun season, and I only have a 50 yard range so for instance I need to know if it should be 2" high for a 100yd zero if anyone can help I would appreciate it. thankyou

[corbinace]

Try a ballistic trajectory calculator online. This one is only one example of many.

http://www.shooterscalculator.com/ballistic-trajectory-chart.php?pl=%5BPreset+Name%5D&presets=30-06+Springfield%7E30-06+180gr+Sierra+Matchking%7EG1%7E0.475%7E180%7E275 0%7E100%7E1.5%7E0%7E10%7E90%7E%7E0%7E59%7E29.92%7E 50%7E1%7E1000%7E25&df=G1&bc=0.48&bw=150&vi=2800&zr=100&sh=1.5&sa=0&ws=10&wa=90&ssb=on&cr=1000&ss=25&chartColumns=Range%7Eyd%3BElevation%7Ein%3BElevati on%7EMOA%7EFBFFF5%3BElevation%7EMIL%3BWindage%7Ein %3BWindage%7EMOA%7EFBFFF5%3BWindage%7EMIL%3BTime%7 Es%3BEnergy%7Eft.lbf%3BVel%5Bx%2By%5D%7Eft%2Fs&lbl=%5BChart+Label%5D&submitst=+Create+Chart+

[buckshotshoey]

I would have to ask.....what is the max range you intend to attempt a shot? About 150 at a deer size target is about max for me.....with open sights that is. My particular application is a 150 yard zero, with a PBR of 175 yds, which puts me about 3.4 inches high at 50, about 3.8" at 100, 0 at 150, and 9 inches low at 200. That is with a 340 gr flat nose at about 1750fps.

Most ballistic calculators require a ballistic coefficient and a known muzzle velocity. You will have to guess at it or use a comparable boolit of a known BC for the calculation. It will get you close. A rough guess would be 4 or 5 inches high at 50 would get you to 150 yrd point blank range. I would start there and try it.

[buckshotshoey]

Ok......I tried a few numbers on my Sierra program. What I came up with, by the numbers you gave me and the ones I had to guess at,.....

4.71" high at 50 yards
5.55" high at 100 yds
0 at 150 yards
And 12.92" low at 200yards.

That is with figuring in a 1.5" above bore scope hight.
It will have just enough energy to kill a deer at 300 (828 ftlbs) but the drop is huge at that range.....64.55" below line of sight.

For a 100yrd zero, go with 2.5 inches high at 50 yds. Your point blank range would be about 135 yards. And will be about 8.5" low at 150 yards. All PBR's are figuring an 10 inch vital zone. I could have figured 12", but I keep that figure on the low side to allow for some error.

[Tom Myers]

I am shooting a 22" marlin 1895 45-70 with noe 430gr rnfp's going appx. 1400 fps @32.4 grs. imr4198. unfortunately I have no chronograph. I was just wondering if any of you had a load close to mine and knew the trajectory. I am getting a 3X scope before gun season, and I only have a 50 yard range so for instance I need to know if it should be 2" high for a 100yd zero if anyone can help I would appreciate it. thankyou

My Son-in-law shoots a marlin 1895 with the RD 460-425-RF Bullet which should be a fair ballistic match to your bullet.
Quick Load indicates that bullet over a charge of 32.4 gr of IMR4198 to have a muzzle velocity of 1422 fps but their calculations usually run a little high, so I went with an estimated MV of 1407 fps.

The rifle scope mounts at 2" high above the barrel centerline.

Plugging this data into the Precision Ballistics software (http://www.tmtpages.com/basbal/bal.htm) offered on the TMT Enterprises Website (http://www.tmtpages.com/) and running the calculations, returns these results.

Estimated Bullet BC is 0.263.
A 100 yard zero would place the bullet strike 1.5" high at 50 yards.

The maximum point blank range with a bullet strike zone diameter of 6 inches would be at 143 yards

The point blank range zero is at 122 yards.

The 50 yard bullet strike within the point blank range would be 2.6" high.

The bullet would be 3" above the line of sight at 70 yards and 2" high at 100 yards.

Hope this helps.



Precision Load Records Firearm Information

http://www.tmtpages.com/LinkSkyImages/45-70%20Trajectory/1895-45-70-RD-460-425-RF-Firearm-Record.PNG


Precision Load Record Load and Target information

http://www.tmtpages.com/LinkSkyImages/45-70%20Trajectory/1895-45-70-RD-460-425-RF-Load-Record.PNG

Precision Ballistics Data Entry

http://www.tmtpages.com/LinkSkyImages/45-70%20Trajectory/1895-45-70-RD-460-425-RF-Ballistics-DataEntry.PNG


Trajectory Detail

http://www.tmtpages.com/LinkSkyImages/45-70%20Trajectory/1895-45-70-RD-460-425-RF-Ballistics.PNG


Point Blank Range Calculations

http://www.tmtpages.com/LinkSkyImages/45-70%20Trajectory/1895-45-70-RD-460-425-RF-Ballistics-Sight%20Settings.PNG


Point Blank Range sight setting changes

http://www.tmtpages.com/LinkSkyImages/45-70%20Trajectory/1895-45-70-RD-460-425-RF-Ballistics-Point-Blank.PNG


Point Blank Range Chart

http://www.tmtpages.com/LinkSkyImages/45-70%20Trajectory/1895-45-70-RD-460-425-RF-Ballistics-Point-Blank-Chart.PNG

[Artful]

Are you using this mold?
http://noebulletmolds.com/NV/images/N.O.E._Bullet_Moulds_460-425-RF_(GC)_424_gr_Sketch.Jpg

[William Yanda]

From the Hornady 3rd ed. Ballistic Tables the closest I could find was a 230gr fmjfp which shows at 1400fps and a 100 yard zero, the bullet will be 3.1 inches high at 50 yards.
hope this helps.
Bill

[Oklahoma Rebel]

wow, thanks, I tried that link to the calculator and it didn't even list my caliber, but im not really good with these computer things. well with thee scope I could probably do 150 yards, but I think I would put my own limit at about 100-125 yards.well at least my 50 yard +2" guess was close. I have pushed the boolit faster, but realistically I could kill a deer going 100fps with a 425gr boolit, so im good were im at, besides that is an ok charge as far as recoil. some people push these marlins so far it scares me. besides, I want mine to last for a while. thanks again everyone!

[Oklahoma Rebel]

artful, that's the mold but mine is a plain base. nice car by the way!

[44man]

Shooting my entire life has shown actual shooting is what gives you the answers. You are handicapped with a short range. Back in the varmint days I set a target from 100, every 50 yards to over 600 and shot each to record drop and how much to click my Balvar 24 to get on. I had a paper on my scope to see. It allowed me to head shoot a chuck over 600 yards.
I am into almost all revolvers today and my 45-70 BFR with a 75 yard setting only drops 16" at 200 and I can hit a can with the right hold over but at 500 yards I look at 26' aiming at a tree branch to hit steel. No way to adjust a red dot or opens for that. Even a scope will bottom out first.
For long range with a 45-70 rifle I made a tapered base.

[Oklahoma Rebel]

I do not allow myself to take iffy shots... don't want to risk wounding an animal and then lose it. besides, like I said, around here 100+ yard shots are almost mythical so it is moot point.Also I am thinking of going to a slower powder, would that help or hurt accuracy? or make no difference at all? thanks, Travis

[Wayne Smith]

I do not allow myself to take iffy shots... don't want to risk wounding an animal and then lose it. besides, like I said, around here 100+ yard shots are almost mythical so it is moot point.Also I am thinking of going to a slower powder, would that help or hurt accuracy? or make no difference at all? thanks, Travis
The only way to answer that one is to put some rounds down your barrel. Every gun is a law unto itself, and there are way too many unknown variables involved to be able to answer it.