45-70 BC sighting troubles.

[silver surfer]

  Gentlemen,
    I have recently decided to "soup up" my BC and shoot a load of 59 grains of H-4198 under a Remington 300 grn HP.  While tickle with the speed, 2525 fps average, and the grouping was good, the old girl is shooting 10 inches high at 100 yards.  Yes; I have bottomed out the sights.  Should I back down on the powder or is there something I'm missing in my reloading? 
  I have decided not to use this bullet for hunting, at least at those speeds, they just fragment on impact. 
  Thanks for your suggestions in advance.

Mike

[John Boy]

Surfer:  You didn't mention the type of front and rear sights that are on the rifle.
To lower POI:
Raise front sight
Lower rear sight
Sight Adjustment Calculator ... http://www.brownells.com/aspx/NS/GunTech/sight.aspx

[silver surfer]

Good point JohnBoy!
  I have the factory Williams sights.  I have lowered the rear past the last scribe mark.  My front sight is the dotted post.  Ever since I learned to shoot a Remington 742 Woods Master with the exact same front sight I have always been partial to that sight.
  BTW, shooting the Federal 300 grn factory loads at 2200 fps (chronied) the gun is just amazing.  Thats why I'm leaning toward backing down on the speed a bit.
  Again thanks for any future advice.

Mike

[quickdtoo]

Mike, if that's a hunting load as opposed to just shooting paper, the 300gr Rem bullet is too soft for even 2200fps, it's meant for trapdoor velocities of 1800-2000fps, if you want to push it that hard, the Speer Uni-core 300gr is a much better bullet, Buffalo Bullet loads it to 2350fps in their ammo. The Nosler PP or Barnes TSX-FB would be even better bullets, the 300gr Rem, Hornady and Speer at 2500fps will be devastating on meat.

As for the front sight, the BC comes with a Lyman 17A sight, it's available in different heights, I use the .404" tall sight for bigger bullets in the 45-120 BC, they come with a .494" or .584" normally, measure the sight from the bottom of the base to the center of the globe to determine what you have and go from there. 

Tim

http://www.gboreloaded.com/forums/index.php/topic,103494.msg1098285249.html#msg1098285249

[silver surfer]

 Tim,
    I totally agree that that bullet is well past it's performance level at those speeds.  I and my family eat what we shoot.  Eating that much fragmented lead is a concern to me!  
  Changing horses in mid stream is not in my financial future, I'll stick with these until gone.  I will back the velocity down and see where it goes from there.  I'll post a report after my next range expedition.

[silver surfer]

About a year ago I switched out the original wood on my BC with a Monte Carlo Rear, and a Squire Forearm.  I have shot ridiculously high with every load I've made since .  I'm am my wits end, the gun still shoots clover leaf groups but they are 12 to 18 inches high @ 100.  Could this be from the rear stock .  I have changed the wood back to original what do you think will be the result.

[LC '92]

Yep. Ain't no way in this world you can get your face on that comb low enough to see those sights correctly. Put the old straight comb stock back on and report back to us here if it fixed it.

Your pal in Texas!

[quickdtoo]

Mike,

I merged your previous thread with this new one so we can get some history, I believe you'll need a new higher front sight to accomodate the new load. As long as you can see thru the sights with the MC stock, that's not the problem, I shoot my 45-70 Handi with a MC stock and the WGRS with no problems, just depends on the height of the comb and how your face fits the stock.

You said your front sight is a "dotted post", tell use more, some background on factory BC sights.... typically the BC should come with a .494" tall 17A front sight, but many come with a .584", in your case, how tall is your sight from the bottom of the dovetail to the top of the blade?

Tim

[mechanic]

I have found that the POI changes dramatically with different bullet wt.s and loads.  Heavy bullet and slow....can't get it high enough at 100.  Light bullet and fast......can't get it low enough.  I have managed to find a happy medium at least for me.  I use the 405 core locs for hunting loads, and 405 gr. hollow base lead for paper.  Both hit very close to the same POI, even though I'm loading the hollow base with Blackhorn powder.

The slower bullet gives more muzzle lift before exiting IMHP.

Ben

[tykempster]

Mechanic, if the slower bullets gave more muzzle lift wouldn't it be hard to get the impact low enough instead of high enough?

[mechanic]

Mechanic, if the slower bullets gave more muzzle lift wouldn't it be hard to get the impact low enough instead of high enough?

Sorry, got it backwards.  Too tired to think today!