The Sierra Game King is an excellent bullet. I would choose the HSM over Winchester factory 375 Win. ammo any day. $35.95 is not a bad price either. Good find Flatnose!

T.S.

 

At the risk of sounding stupid, what is HSM ammo? I don't pay much attention to factory ammo other than Rim fire.

 

https://www.hsmammunition.com/ perhaps, I don't know for certain

 

Yes, that's them. They're out of Montana. They started out years ago dealing direct to the public. Now you have to go through retailers. Good stuff. If memory serves, the HSM stands for Hunting Shack Munitions, or something like that. They're old website was TheHuntingShack.

 

That'll be especially good news for those that don't reload!

 

Big Supply Shop has Winchester, 375 Win in stock as of today. $51 something a box if anyone needs some..

 

I bought a box of HSM 30-06 ammo around 2003 before I started reloading. It was the most accurate, tightest grouping ammo I've ever shot in my Savage 110. I must have tried 20 or more different brands, bullet weights and bullet types, to include Federal Gold Medal Match 168gr BTHP, but that HSM 165gr BTSP shot tighter groups than all the others.

Needless to say, I was very impressed with the quality and reliability of their ammo, and wouldn't hesitate to buy more if I didn't roll my own.

 

"Big Supply Shop has Winchester, 375 Win in stock as of today. $51 something a box"

WOW!

...boy, when winchester tries to kill off their young - they go all out, don't they?!!

..and me being called a hoarder - when I started buying all the hornady 220 slugs I could - some folks call me ******* - others think i'm clairvoyant...

 

I had never heard of them before. Out of stock already. Too bad.

 

I guess the silver lining is that 375 Winchester is really easy and fun to reload. :biggrin::biggrin:

T.S.

 

I'm an experienced reloader and found the .375 to be a PITA to reload. I only recently started to load for it. I'm using the Sierra 200 gr. bullet and Reloder7. The charges are from the Sierra manual and so heavily compressed that it is difficult to get a consistent seating depth. I haven't yet found a non-compressed load that will give decent velocity.

 

Have you tried H4198 yet? What brand of brass do you have for 375 Win? I haven't tried RL7, so I don't have it for a comparison. I had H4198 for my 45-70 so that's what I use for 375 Win.

I load my leverguns for tight groups more than velocity. Once I find a tight grouping load, I'll shoot through the Chrony and increase the powder charge by 1/2 grain until my groups get bigger than I want.

 

Re: the BB brass...I believe that it's Bertram Brass
Also, here's a headstamp database:

Headstamp Codes - International Ammunition Association

 

IMR4198 for me in the 375 and 200 Sierra. 33grs gave unreal accuracy.

 

HSM ammo is mucho goodo! Top-notch in my book.

 

Basically a rimmed straight case with no shoulder to get shoved back, what's not to like. I've been loading for my Marlin since I bought it new.

 

I haven't tried H4198 yet, but I will. I have an unopened can of it that I don't even remember buying. I must have gotten it for the .45-70. My cases are head stamped W-W Super. Until Starline started making .375 cases I think W-W Super is all there ever was. I don't remember Remington or Federal making any .375 ammo.

 

That W-W Super brass should be good and consistent for accurate loads. I've never used it for 375 Winchester, but I did for my 300 Win Mag, and it shot some excellent groups.

It's been awhile since I loaded any 375 ammo, but I think I used the starting load that is published in the Hodgdon reloading book, and it shot good enough for a hunting load. I'm hoping to do some more load development this summer for my 375W. I'll increase charge weights in 1/2 grain increments, from start load to max load (maybe not that high) until I find the rifle's sweet spot.

 

I just started loading the .375/200grn Sierra bullet with rl7 and had no problems loading up to 38.2 grns. By the time I pay shipping the price through GB the same as a local GS.