Post by Bullshop on Mar 9, 2020 8:00:46 GMT -7
Question
I've got two .375 Rugers (#1 and Hawkeye African) that I'd like to get more use out of and am hoping cast is the way to go.
I'm leaning toward the Lyman 275 grain flat nose, gas check to keep leading to a minimum and plan to run them around 1800 FPS.
They'll primarily be plinkers and I may take them to the deer stand from time to time if the accuracy is there. If I get the opportunity, full power loads will take care of anything bigger.
Initially, I'm thinking 200 bullets to play with.
Let me know your thoughts...payment method etc.
answer
Mt thoughts
The 375 Ruger and 375 H&H rifles as well as even larger cartridges in this caliber use a 1/12” rifling twist rate where the 38-55, 38-56 and other vintage cartridges in this caliber used a 1/18” rifling twist rate. The Lyman 250 gn plain base and its gas checked version the 275gn bullets were designed for the 38-55 and so have a bearing length more commensurate with the slower twist and lower chamber pressures of the 38-55 and such.
The 375 Ruger and 375 H&H and other cartridges in the same caliber with the faster 1/12” twist and higher chamber pressures generally do better with cast bullets that have a longer bearing surface to better handle the increased torque of the faster twist and the higher chamber pressures associated with what we consider the dangerous game cartridges in this caliber.
The Lyman 275gn gas checked bullet can work but will be less flexible and more limited as to velocities and chamber pressures. Bullet designs such as our 325gn RN and 375gn LFN will be capable moderate or full power loads where the lighter shorter bullet designs will handle moderate loads well but perhaps not so well with full power loads if you eventually choose to go that rout.
In our experience in developing loads for the 375 Ruger cartridge we had very good results even at full power with our 375gn LFN GC design. You asked for my thoughts and these are.
reply
Dan,
Appreciate the quick turn-around on the bullet order. They look and shoot great. My kids were especially impressed with your ability to perfectly sized boxes out of recycled material!
I was able to load a series of test loads with RL 7. 40/41/42 grains under the 370 FN GC. At 50yds they showed very good accuracy out of my Hawkeye African. I didn't chronograph the initial series, but anticipate the 42 grain load was around 1900 fps, maybe a bit faster.
I've got two .375 Rugers (#1 and Hawkeye African) that I'd like to get more use out of and am hoping cast is the way to go.
I'm leaning toward the Lyman 275 grain flat nose, gas check to keep leading to a minimum and plan to run them around 1800 FPS.
They'll primarily be plinkers and I may take them to the deer stand from time to time if the accuracy is there. If I get the opportunity, full power loads will take care of anything bigger.
Initially, I'm thinking 200 bullets to play with.
Let me know your thoughts...payment method etc.
answer
Mt thoughts
The 375 Ruger and 375 H&H rifles as well as even larger cartridges in this caliber use a 1/12” rifling twist rate where the 38-55, 38-56 and other vintage cartridges in this caliber used a 1/18” rifling twist rate. The Lyman 250 gn plain base and its gas checked version the 275gn bullets were designed for the 38-55 and so have a bearing length more commensurate with the slower twist and lower chamber pressures of the 38-55 and such.
The 375 Ruger and 375 H&H and other cartridges in the same caliber with the faster 1/12” twist and higher chamber pressures generally do better with cast bullets that have a longer bearing surface to better handle the increased torque of the faster twist and the higher chamber pressures associated with what we consider the dangerous game cartridges in this caliber.
The Lyman 275gn gas checked bullet can work but will be less flexible and more limited as to velocities and chamber pressures. Bullet designs such as our 325gn RN and 375gn LFN will be capable moderate or full power loads where the lighter shorter bullet designs will handle moderate loads well but perhaps not so well with full power loads if you eventually choose to go that rout.
In our experience in developing loads for the 375 Ruger cartridge we had very good results even at full power with our 375gn LFN GC design. You asked for my thoughts and these are.
reply
Dan,
Appreciate the quick turn-around on the bullet order. They look and shoot great. My kids were especially impressed with your ability to perfectly sized boxes out of recycled material!
I was able to load a series of test loads with RL 7. 40/41/42 grains under the 370 FN GC. At 50yds they showed very good accuracy out of my Hawkeye African. I didn't chronograph the initial series, but anticipate the 42 grain load was around 1900 fps, maybe a bit faster.
