Originally Posted by Sharpsman
J E CUSTOM
I find it hard to believe that if you're shooting an elongated bullet such as what we shoot in BPCR competition out to 1000 yards that your projectile is stable; especially if you're shooting a bullet akin to the Postell or one of the bullets of around 550 grs. weight and running around 1.437" in length!! Normally...most shooters shooting comp at long range use a 1-18" ROT if shooting say a .45 caliber and in some instances a 1-16" ROT! The objective is to obtain nice and round holes through the target paper and historically a rifle with 1-48" ROT is good for nothing but ROUND BALL stuff! With a 1-48" ROT....you'd certainly need to have the bullet/projectile moving out at around 2500 fps or better for maintenance of stability and I doubt that's gonna happen!
Oh...as to the .45/70 being used with SP vs BP and not doing to well.....that's baloney! Several matches this past season held up in Wyoming/Montana way were WON with a .45/70 caliber shooting what??????......BLACKPOWDER!! Velocities were running somewhere around 1120 to 1200 fps or maybe just a tat over 1200 fps in a couple of instances! For these old straight-walled cases......nothing beats BP and smokeless powder WILL NOT deliver the SDs that can be obained with BLACKPOWDER!!
First let me thank you for pointing out all of my shortcomings and the Typo
( It should be 1in 28 not 1in 48 for the rate of twist ).
Also I have owned many 45/70s and know what they are capable of and
have loaded them in the Browning B-78s to near 458 win velocity with
smokeless powder and they performed very well in a 1 in 14 twist using
500gr jacketed bullets!!
And if you read my post I also mentioned Hand made bullets that worked
well but needed more twist to stabilize, these were made of copper and are
spitzer boatails hollow points. That also weigh 500gr and have a much higer
blistic coefficient than lead .
The reason I am building a 45/110 with a 1in14 twist is to shoot these
bullets or other jacketed bullets at 2000ft/sec + in a Browning hi wall
which like the Ruger #1 is one of the strongest of the falling blocks,
Shooting paper is a lot different than shooting at a live animal but I will
share with you the reason I feel the 45/70 is not up to the task at
1000yrds even for paper and in the hands of an expert.
Here is the comparison Between your 45/70 and my 45/110 load at
Velocity 704 ft/sec
Velocity 1060 ft/sec
Energy 610 ft/lbs
energy 1247 ft/lbs
Time of flight 3.186 sec
Time of flight 1.922sec
Optimal game weight 160 lbs
Optimal game weight 446 lbs
Even you can see that 45/70 has its limits and 1000yrds is streching
this fine old cartrige for (shooting round holes in paper) and is beyond
the limits for game.
And as you know if you shoot 1000 yrd BP matches most shoot 45/90s
or bigger because conditions are seldom perfect.
This is not a personal attack on you ,just felt I should respond for those
who read and enjoy this site like my self,and form there opinions based
on suggestions by others.
J E CUSTOM