Marlin Firearms Forum banner

1 - 5 of 5 Posts

·
Registered
Joined
·
30 Posts
Discussion Starter · #1 ·
I went to the range yesterday and got out the chronograph.

.45-70 (of course)
Marlin Guide Gun non-ported
Beartooth Bullets 325g Hardcast Gas Checked
Sized .460
IMR4198
Winchester Large Rifle primers WLR
Winchester Brass (fired 1 time then resized)
Chrony set at 15'
Temp 45f.

I observed the following:

35.0g 36.0 37.0 38.0 39.0 40.0 41.0 42.0 43.0 43.5 44.0 44.5 45.0
1473 1437 1497 1532 1589 1643 1681 1699 1813 1797 1757 1838 1859
1423 1444 1497 1480 1559 1614 1635 1751 1747 1750 1780 1808 1878
1404 1424 1504 1499 1561 1650 1626 1731 1792 1734 1806 1808 1831
1839 1910

I was just looking at velocity not group.That comes next.
The reloading sources are a bit scarce for the 325g.
45.0g was my stopping point, some books suggest 48.0 or 49.0 as a max. That seems a bit heavy to me.
What do you think?
37.0 looks like a good plinking load.
44.0 and up for a white tail load.
Of course shooting for accuracy is next.
Should I go higher in powder weight? different powder? Opinions? Thoughts? Hints? etc.

Thanks, Charles
 

·
Registered
Joined
·
194 Posts
I myself would be happy with the top velocity you are getting (with a hard cast) of 1850 to 1900 fps. I used IMR4198 to start with in the 45-70 but was able to improve the velocity variation some by using RL-7. Have better luck with the IMR in my 458wm. But overall looks like you did some good testing and could pick out a good load form this data once you have done some accuracy testing. Good luck.

Domenic
 

·
Registered
Joined
·
681 Posts
What is the BC on this bullet?
 

·
Registered
Joined
·
30 Posts
Discussion Starter · #4 ·
Good question. I don't know.
I do know the length is .830 meplat is.290, but I don't have a formula to calculate the BC.
 

·
Premium Member
Joined
·
5,222 Posts
I shoot the 320gr. RCBS. Very similar boolit. RCBS lists it at 300, but in my wheel weights, its heavier. I used H4198 and could load it up to 2400 with good accuracy. Best accuracy came right at 1900fps. That load (think it was around 41 or 42gr. of H4198 went all the way through every deer I shot. Makes you wonder why we use these heavier boolits with the lightweight game... It isn't the biggest meplat, but the accuracy is all any cast boolit could possibly be. That to me is key for making the kill.
 
1 - 5 of 5 Posts
Top