Home Forums Hunting & Shooting Express Rifles and Big Bores Only 375 AI, 270 gn. TSX and RL-17...WOOOHOOOO!

U gotta catch them coming or going then you'll get a bit more loft.

I've shot a ton of chucks with my .340 and it works them over pretty good as long as I don't take them when they're standing up.

Wait till they're done with lunch and then pop them as the waddle to or fro.


Dober

If you can achieve that, and you sight in so the bullet peaks at 3-inches high at 150yds, then at 300 yds, the 350gr TSX bullet would still be traveling at 2,100 fps/3,424 ft-lbs and be only 6.1-inches below the sight line. You could take out elephants or half-tracks at close range and still have a flat trajectory out to 300yds where the bullet would have almost the muzzle energy of a 300 Win Mag. That would be a great one-gun Africa setup. Overkill for anything in N. America.

toad yes I remember it......exactly what my 375 weighs.....the standard one

I dug up that old article in Rifle magazine and for those interested it's in the November/December 1973 issue.The author was John Y. Williamson and he rechambered two rifles;a Rem 700 and a M70 Winchester.

He topped out at 96 gr of the old N205 with the 270 gr Nosler Partition for a velocity of 3024 fps;with 94 gr the 300 gr NPT did 2915....not too shabby,considering we are 38 years after the fact and gunner has managed to notch it up to over 3100 with the same bullet and RL17.

I recall in messing with Thor that it measured in the mid 2900's with the 275 gr Bitterroot but don't recall the precise charges.

In any event these blown out 375's of whatever name and pursuasion can offer a guy some substantial increases in velocity if he somehow finds the standard H&H case lacking somehow.

MarineHawk, I ran some numbers on the 300 gn Accubond at 2900 fps, they are quite impressive for all NA and African plains game and I think they would be equally effective on cape buffalo and the cats.
I have to believe the accubonds will perform better than the 270 hornady spitzer and 300 gn hornady round nose bullets of old at speeds approaching the 378 Weatherby, even one the dangerous animals.

At 400 yds it still packin' 2176 fps. and 3154 ft. lbs. and is only -11" w/ a 300 yd. zero and blown 11" off in a 10 mph wind @ 90 degrees.

Gunner

I wish I could have read that old article to Bob, but I was 10 in '73

I used to run MRP in the WBY cals back then, and have been foolin' w/ the 375 AI's since the early ninties, and came across around 10 lbs. of the old N-205 at a gun show, with the 205 gone N-204 has been the next best thing for my rifle, that is until the other days little RL-17 experiments.
And the old H&H has never been lacking to me, I still have one, and always will, just kinda fun seeing what else can be accomplished in a given amount of capacity.

Gunner

does anyone know where to start with 375 RUM with rl17 with 270 TSX or 300 grains. any info would help me test the RUM with rl-17

I dont a 375 Rum mound, but just lookin' at the RUM case, I would think RL-22 would be your best bet if Your lookin' for alittle more speed.

Gunner


edit: spelling

Bob mentioned Thor and it was one of a pair of 375 H&H AI's which I had built somewhere around 1989-1992. The action (pre 64 M70's) and barrel work was done by the late great Tom Burgess and then both were stocked in synthetic. One had an 1-8 and the other a 1-9 twist. The weights were 7.25 and 7.5. The only thing I have shot that hurt me more was a light 378 Wby. Both would drive 250 BC's over 3125 with either 4895 or 4064. The barrel lengths were 21 and 23. I eventually sold both. They were very difficult to shoot well but were very accurate. One went to a fellow in New England and the other is in Boise.

I also had Tom make a 375 Wby and it was the same thing with a different shoulder angle. Then I tried a 375-06 AI/ They are all gone as well.

Gunner, In my RUM i just got back from tanzania and used 100 grains of 7828 with 300 tsx for 2850 fps but i would not mind trying rl-17 with some diffrent bullets just to see I just do not quite know where to start

Okay, i see what You mean now, I would start at 90 gns. of RL-17 with a 250 gn. Barnes TTSX bullet and work up slowly, the 17 may be a very good powder in the 375 RUM with the lighter bullet weights ie 235/250.

Gunner

thanks I will give them a try with the 25's and see how it goes. The 300 tsx load killed like thor and 300 yards was easy shooting

10-Roger mound, Barnes lists 85 gns of RL-17 for there 350 TSX, so 90 with there 250 will be a nice mild starting point, a 250 TTSX @3300 fps would not surprise me one bit from Your RUM.
I bet You didnt recover many of those 300's did ya?

Gunner

Kids....

Gunner if you want drop me a PM with contact info and I will get you the article.


RinB; All these years I thought it was Thor I had shot but was not aware you had built two of the things....did not know Burgess did the metal on that rifle, but it sure was a nice one.....recoil was stout, to say the least

10-Roger, Thanks Bob

PM on the way.

Gunner

I actually did recover one it was perfect. I shot a zebra slight quarter and found bullet in his back hip all petals intact and perfect. I will give the 250 ttsx a try and see what happens

QL shows 90 gr. RE17 to be about max with the 270 gr. TSX in the .375 RUM. i've seen that QL is conservitive in the .375 RUM data without tweaking the weighting factor, but i'd still back it off to 80-85 gr. and work up. i know working up a load with $1 bullets sucks...

i'm using 90 gr. RE 17 under a 260 gr. Nosler AB with mild pressures, both observed and computed.

i haven't tried leaning on it too hard. the purpose of my project wast to equal or slightly exceed standard .375 H&H performance in a lighter shorter package and at lower pressures (to preclude extraction issues in the field).

Wonderful old article, and Thanks a bunch for sending it Bob

Gunner

Gunner: Glad you liked it.

I've been wrong b4 and could well be this time again and maybe just maybe I should keep my mouth shut on this one but I just can't. Sorry guys..grin

I keep coming back to my experiences with R17 and H4350 and this is only based off my experience with My 375 Wby with H4350 as I've not run 17 in it yet.

But, 95 seems like a ton load, and the speed your getting (3110 with a 270) is a bit stout. Fact is and like I said I could be wrong on this but it may be safe in your rig but I doubt it would be in others.

Gotta wonder what kind of pressure you're getting with this load as my gut tells me that it'd be well over the top in most rigs..

But, like I said I could be wrong. What kind of primer pocket life are you getting out of the load? I'd bet the pockets will be loosy goosy after 3 dings at best.

Sorry gang, don't mean to be a kill joy on this but this just doesn't seem right to me. I'll give 17 a go in my rig just to see how it perks/works in mine.

Thx

Dober