Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

.375 H&H 300g bullets best velocity

 
LinkBack Thread Tools Display Modes
  #43  
Old 04-20-2014, 10:40 PM
Silver Member
 
Join Date: Nov 2007
Location: Near Mt Rainier
Posts: 224
Re: .375 H&H 300g bullets best velocity

If you want a dense ball powder, MagPro, might be useful. It is a St Marks (Florida) powder just like Winchester 780. I can get amazing velocity with 140 Bergers and Accubonds in the .270 WSM. I haven't found any other applications where it has a velocity advantage. I have tried 6.5 WSM, 6.5-284 (9 twist so 130 Accubonds and Berger VLDs) but it has its place and is available.
Reply With Quote
  #44  
Old 05-27-2014, 09:22 AM
Gold Member
 
Join Date: Dec 2009
Posts: 857
Re: .375 H&H 300g bullets best velocity

I finally succeeded in getting an acceptable group during load development. Using 300 gr SGK's and RL-17, I obtained a 1.1" group @ 100 yards. Pics and details coming soon...
Reply With Quote
  #45  
Old 05-31-2014, 12:03 AM
Gold Member
 
Join Date: Dec 2009
Posts: 857
Re: .375 H&H 300g bullets best velocity

.375 H&H 300g bullets best velocity-p1000360.jpg

Here is a pic of the 1.1" group that I obtained with 300g SGK's and RL-17. I later chronoed this load using my Magnetospeed V1. The 10 shot average from my rifle was 2780fps. While it is certainly not a match winning group, it is adequate for now and at least serves to illustrate that the old H&H has untapped potential. I am encouraged by the lack of vertical exhibited in this group and look forward to giving it a try out to 600 yards or so.

I noticed the other day that I have contact between the forearm and barrel on my rifle, so I am going to have some bedding work done. Will see if that shrinks my groups or not.
Reply With Quote
  #46  
Old 05-31-2014, 08:15 AM
Gold Member
 
Join Date: Dec 2009
Posts: 857
Re: .375 H&H 300g bullets best velocity

Here is a pic of my rifle:

.375 H&H 300g bullets best velocity-p1000366.jpg
Reply With Quote
  #47  
Old 06-03-2014, 08:40 PM
Gold Member
 
Join Date: Dec 2009
Posts: 857
Re: .375 H&H 300g bullets best velocity

Here are pics of the rest of the groups in the powder charge runup. I decided to seat the 300g SGK for a light jam (about .010") because this rifle had shown very little in the way of seating depth preference in past testing, so it seemed to me that seating to jam might be worth a try. These groups are pretty representative of what I have been struggling with in my testing up to this point. They are all pretty big groups, with several of them having a maddening tendency to print two shots close together and one shot way out of the group. Note that the third shot on the 76.9g group didn't even hit paper:

.375 H&H 300g bullets best velocity-p1000355.jpg

.375 H&H 300g bullets best velocity-p1000356.000.jpg

.375 H&H 300g bullets best velocity-p1000357.jpg

.375 H&H 300g bullets best velocity-p1000358.jpg

.375 H&H 300g bullets best velocity-p1000359.jpg

.375 H&H 300g bullets best velocity-p1000361.jpg

Though these groups don't show any of the classic signs of bedding issues, I am hoping they will tighten up some after I have the factory bedding/barrel channel clearance tweaked by a gunsmith.
Reply With Quote
  #48  
Old 06-03-2014, 09:00 PM
Gold Member
 
Join Date: Dec 2009
Posts: 857
Re: .375 H&H 300g bullets best velocity

.375 H&H 300g bullets best velocity-p1000364.jpg

These are the bullets I have worked with to one degree or another so far. From left to right, Barnes 250g TTSX, Hornady 300g SPBT (discontinued), Sierra 300g Game King, Cutting Edge 300g MTH, and Sierra 350g Match King.

Now that I have the 300g Game Kings shooting acceptably, I will see if I can obtain similar results with the Cutting Edge bullet. Based on previous behavior, I would expect the MTH to produce 2800+ fps with RL-17 if its accuracy node is similar to that of the 300g Sierra.

On the far right is a 350g Sierra Match King loaded to a COAL of 4.040", which is slightly more than a .010" jam. I shot a basic velocity runup across my Magnetospeed chrono using RL-22. The max loads topped out at 2600+ fps with no pressure signs in 85* weather. If I can get this bullet to shoot, it would give me an affordable long range practice load and may just cause me to forget the 300g class cup and core bullets.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Current Poll
In the last 12 months, what was your longest rifle kill on big game?
0 to 200 yards - 26.00%
1,549 Vote
201 to 400 yards - 32.16%
1,916 Vote
401 to 600 yards - 23.00%
1,370 Vote
601 to 800 yards - 10.04%
598 Votes
801 to 1,000 yards - 3.91%
233 Votes
Over 1,000 yards - 4.89%
291 Votes
Total Votes: 5,957
You may not vote on this poll.

All times are GMT -5. The time now is 09:07 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC